Method to arrange mine tunnels in mines that are dangerous due to methane gas content
SUBSTANCE: previously laboratory analysis is carried out on coal from a bed and its packs to detect availability of elements and substances in them that may create compounds with water; natural cracking is detected, as well as cleat in the coal bed; wells are drilled from a bottomhole by coal, with length more than by 1 m of the mine skirting cycle; water is injected into the bed with continuous measurements of the methane, water pressure, injection time; the mine is tunnelled for the value of the hydrated bed with the speed that does not exceed methane release within permissible norms; in the area of bed hydration blast holes are drilled in the sides of the mine at each cycle to detect the hydration area. During arrangement of the mine, parameters are varied, which are related to injection of water into bed, maximum reduction of the released methane, optimising arrangement of the mine.
EFFECT: higher efficiency of development of gas-bearing coal beds.
As taken similar RF patent №2168638 "Method of degassing vysokogazonosnyh seams and mine sinking". Class patent E21F 7/00, application number 99123736/03; published 10.06.2001; the applicant Kuzbass state technical University; authors: Dyachkov A.I.; Galanin A.F.; patentee Kuzbass state technical University.
Problem solving is achieved by the fact that according to the method of degassing vysokogazonosnyh formations when drilling mining, including drilling downhole and barrier wells and connect them to ghatotkacha system, first conduct advanced generation, then they meet passable workings of the Buryat barrier and downhole wells and connect them to ghatotkacha system from advanced workings, and barrier wells are drilled to the drainage area of the array of coal, and downhole wells are drilled in the bottom passable roadways.
The disadvantages of this method:
- conduct advanced workings for advanced barrier drilling and downhole wells, and then connects them to ghatotkacha system is possible, but it involves additional costs, and with increasing depth and development fields such advanced production are also vysokogazonosnyh;
diagram of the directional location of wells-ahead BU the program is consistent with the direction passable roadways, not possible from them extract methane in the transverse intersection of the natural cracks, cleavage, eliminating excess water pressure in the wells, for degassing unloaded coal seam wells, specially drilled for maximum efficiency outgassing from them, it takes time for at least one year, unfortunately, the term degasification wells drilled when drilling shale gas mining with the goal of significantly reducing methane emissions in them is very limited, because they are associated with podvigina production, therefore, they are ineffective.
This method for mining gas methane offers a different approach to the task.
Successful and stable operation of the mines, hazardous gas methane, mainly depends on the timely preparation of quality treatment front, responsible for all security issues. Of Prime importance exposing and preparing the excavation completed, primarily by coal or coal bomb it with the side of the rocks. A serious limitation in pace of such development workings is methane, the selection of which increases with increasing speed podvigina, as in the bottom and sides of the driven working. We are talking about mines with high methane emissions, where to prepare the ke new horizons and excavation sites, the rate for mining become pervozdannym.
In Krasnodonugol W/we worked through the layer m8' relative gazoobilnostju 106,5 m3on m need to spend to meet a passable down the coal with bomb it rocks flank pit No. 1 great length, see figure 1, 2, the linkage from the bottom up coal at an angle of 14°, 1. But drilling and blasting method on sverhkategorijnoj mine gas methane, conducting mines, especially coal from the bottom up by the invalid, and the layer of anthracite reaching the fortress on a scale professional Protodyakonov 2-2,5, did not leave the choice of the other known methods of coal extraction in such conditions.
Among the anthracite mines of JSC "Rostovugol" anthracite in Krasnodonugol W/u was one of the most strong, it was not possible to apply in the love for the extraction of coal plow installation, as the working body of the plane could not chopping coal this fortress.
In the result, it was decided, in which few believed, for the first time to undergo such development, 1, excavation of coal jackhammers after pre-advanced moisture. In the center of the bottom output with parameters 2×1.4 m were drilled hole, 4, depth of 2.5 m and produced water injection into the reservoir, used from the Seversky Donets river, the quality parameters are close to drinking water, under pressure 110 psi for 1-1,1 hour before until the pressure is suddenly pada is O. Cm. figure 1. During the period of water injection into the reservoir heard multiple different crack volume, followed by periodic thump. The shaft did 300 m3/min of air pumped FMP, the methane content did not exceed the permissible norms PB. After the injection of water into the formation and education of the General zone moisture, 5, two workers stope produced dredging coal jackhammers with podvigina slaughter on two meters before the end of the shift, 6. In the next change cycle was repeated. After the extraction of coal, periodically from the bottom of boreholes were drilled on the flanks of production to determine the width of the zone of hydrate, 7. It was 1-1,2 m - 3 after which, passing into the anhydride anthracite, resistance drilling sharply increased with a marked increase in methane emissions from the drilled hole. For day passes eight meters, and a month before the breakthrough was passed 182 m generation by coal. The experiment was a success.
For the entire period of this production has not been a single case of excess methane content compared to the acceptable standards of the IB. Cm. gas survey, figure 2, where the dashed line shows the local concentration of methane, solid line - the methane content in the outgoing generation, 8 - period of drilling the borehole for injection, 9 - period of water injection, 10 - period excavation jackhammers in the change.
At the same time, URF No. 1-2, passes downwards drilling and blasting method with a separate recess of coal and rock. Aeration was carried out by local ventilation fans with supply 300 m3min of air at the bottom of the pit. When breakthrough of the pit with the linkage of coal carried out bottom-up, there were less than 100 m, after each blasting on coal pit was conducted three times the gas shooting. Cm. 3, 11, 12, 13. The volumes emitted after an explosion at a coal reaching critical values, is obvious.
When water is injected into the reservoir occurred physical and chemical reactions. Physical reaction operates when water is injected into the formation under high pressure, breaking ties in the corner, significantly reducing its strength, with the possible formation of tiny particles - macro-, micro - and nanoparticles.
Based on the latest nanotechnology research proved that a neutral solids, in our case, anthracite, fracture to the smallest particles in combination with the environment, in this case water, acquire new properties - viscosity and react with substances that are present in coal, .
Coal contains a number of elements, oxides, complex particles called complexes. When connecting to water (H2O the most common basic oxides Cao and MgO to form calcium hydroxide:
and magnesium hydroxide:
MgO+H2O=Mg(OH)2[3, str, 392],
which together with the fine particles of coal, changing their properties, their compounds and complex substances fill macro-, micro - and nanocracks in the corner, preventing the release of methane. As a result, after the injection of water into the reservoir from the bottom output area created as the front of the face, and the sides of framing, blocking the path of the active methane, see figure 1.
Thus, as a result of physical and chemical reactions water is a very reactive substance. The oxides of many metals and nonmetals combine with water to form bases and acids; some of the salts formed with crystalline water, the most active metals react with water with evolution of hydrogen [3, str].
The content and number of elements and compounds with them in different coal fields differently depending on their metamorphism (from the Greek. metamorphoomai were subjected to the transformation). These transformations occur within tens and hundreds of millions of years in the absence of oxygen, high pressures and temperatures deep inside the earth's crust, where organic substances get along with other breeds as a result of tectonic processes.
Conditions of formation of coal from organic substances differ. They are the peat bogs, bottom sediments of lakes, marine lagoons [4, p.54].
The content of compounds of many elements in coal, formed in marine lagoons, the same as in sea water in a dissolved state, the largest number of which falls on Cl, Na, Mg, S, CA, K, S, Br, In, Sr, F, N, Li, Rb, P, I, Fe, Zn, Mo. Each kilogram of sea water contains more than 19 grams of chlorine, more than 1 g of magnesium etc., on average, 35 g of various salts [3, str].
Obviously, the content of compounds of many elements in coal, formed in peat bogs or in the bottom sediments of lakes, may differ materially from formed in marine lagoons.
Due to the fact that many of the elements of connection with them in the formation of coal in different geological periods and different conditions can vary greatly, it is desirable developed in each stratum of coal, it packs to perform laboratory analysis in order to accurately identify these elements and compounds with them.
The information obtained will allow more competently prepare the project of the gas production, which ensure its maximum permissible speed of the limits of PB content emitted from the bottom and sides of excavations, almost by varying the arrangement of the holes in the bottom for water injection into the reservoir, their length equal to the cycle podvigina slaughter per shift or per day and, pressure during water injection into the reservoir, by the time of discharge, ultimately to establish optimal parameters to minimize emitted when conducting electricity. Over time, with experience, the statistics of the parameters that maximize the reduction of methane emissions, it will be possible to identify the pattern of the influence of these parameters on the reduction of emitted methane and mathematically determine their optimal value.
Important work digging machine, mining rock mass, which should consist primarily of large fractions of coal that contain methane from slaughter transport in developing the mine and then to the surface. This is achieved by skilful selection of cutting scheme and spallation working body of the harvester coal face. Their participation in the solution of this problem could make and designers roadheaders.
Drilling in the gas-bearing coal in the preparatory workings with the subsequent hydration is perceived additional costs. They will be repaid with interest if the case will be set so that ultimately result in increased speeds podvigina workings will be enough time to prepare new horizons, excavation of land, love, avoiding a gap in training, where considerable time is required for the integrated degassing excavation of the site, including degassing unbalanced formations, carried out with greater efficiency with covered openings. This will result in an increase in the load on the lava, and this is the path to the concentration of mining operations, increasing the load on the shaft, the main factor determining economic growth.
The implementation of the invention
Gas survey conducted by the production of coal from the bottom up with the notch coal jackhammers after pre-wetting layer from a position above modern knowledge explains to reduce outgassing and helped to identify the potential for increasing the speed of conduction of the gas bearing openings due to the increased mechanization of their conduct. As the example shows this output in figure 4, where 14 - development on the seam of coal with high outgassing; 15 - wells for the next cycle of coal extraction; 16 - zone ublajenie laterally production of coal; 17 - the total area of moisture ahead of production for the next cycle of extraction of coal; 18 - excavation of coal per cycle; 19 control bore - holes that define the width of the area moisturized.
Before the implementation of the proposed method of carrying out gas generation by coal or coal with side bomb it rocks you should make the following preparations and action.
1. To make laboratory analysis of reservoir and its packs for the purpose of revealing the presence of the element is in, oxides and other substances that can form new connections to the water flow.
2. To detect natural fracture, cleavage in the formation of coal.
3. Prepare tools for drilling for coal injection plant with pressure measurements and flow of water, supply of water, preferably drinking, devices episodic and continuous measurement of methane, control the number of people entering the bottom of the air
4. Drill from the bottom of coal equal to the cycle podvigina generation plus 1 m
5. To produce the water injection into the reservoir with continuous measurements of methane, water pressure, time of discharge.
6. On the value of irrigated seam to go production with the rate not exceeding the methane within the permissible norms IB.
7. In the zone of hydrate formation in Boca output each cycle the drill phury in order to detect the width of the zone of hydrate, which is a barrier to active methane: the output of the humidified rubble from the hole, before increasing the strength of the coal, until the release of methane from the hole.
8. Later, during production, by varying the parameters associated with the water injection into the reservoir, the maximum reduction of emitted methane, to find the optimal variant of the proposed method of carrying out production with high outgassing.
If in the further this method of excavations with high outgassing seriously to combine the research and production base for the study and dissemination, it is possible to achieve a sustainable rate of excavations with increased gassing up to 600-1000 m/month, which will ensure the timely preparation of new horizons, excavation sites and development of the mine as a whole.
1. The Internet is a Danger of nanotechnology. Is it real threat." Published Svilinenko, October 26, 2009.
2. Internet "the Most common nanoparticles are hazardous to health". Published empirrv, November 24, 2009.
3. Glinka D., "General chemistry", Moscow. Integral press, 2008.
4. Kiselstein L. "solar stone", W. "Science and life" №8, 2010.
Method for mining in the mines, hazardous gas methane, with the aim of increasing the rate of their podvigina for more efficient testing of gas-bearing coal seams, wherein the pre-do laboratory analysis of coal from the seam and its packs for identifying elements and compounds that can form new connections when the supply of water; identify natural fracturing of the formation and cleavage in it; from the bottom of coal drilling of wells longer than 1 meter cycle podvigina production; the injection of water into the reservoir with continuous measurements of methane, water pressure, time of discharge, are output size humidified layer at a speed not exceeding the methane within the permissible norms safely the STI; in the zone of hydrate formation in Boca develop periodically in each cycle are drilling the holes for detecting the width of the zone of hydrate, which is a barrier to active methane, in the presence of output humidified rubble from the hole, before increasing the strength of coal and prior to the increase of methane release from the borehole; later, during production, by varying the parameters associated with the water injection, the maximum reduction of emitted methane, find the optimal variant of the method of the workings with high outgassing.
SUBSTANCE: method includes long-term treatment of a dust and gas cloud with water vapour during the blast and afterwards. Vapour is produced by a mobile steam generator by introduction of water in it that has been heated previously up to 65-70°C. The steam generator is installed in the place that is safe from the blast and is directed along with the wind. Besides, prior to blasting, atmosphere above the blasting area undergoes treatment.
EFFECT: higher efficiency of dust suppression, manoeuvrability of plants.
SUBSTANCE: device of pressure water supply to irrigation systems arranged on sections of shield mechanised support for underground mines, includes at least one system of plough or combine working element route irrigation in longwall, and at least one system for irrigation of worked space, upper ceiling and/or side mine with central water line for supply of spray nozzles of irrigation systems and switching valves. At the same time all switching valves for irrigation systems are installed in a single irrigation valve box, which is equipped with connection for water line and is arranged on section of shield mechanised support in the form of unit separated from hydraulic valve box.
EFFECT: improved operational safety of device for water supply into irrigation system.
8 cl, 4 dwg
SUBSTANCE: invention is related to the field of mining, in particular, to safety issues in coal mines, namely to explosions of methane caused by friction spark created as a result of mine machines picks friction against hard rocks. Method is suggested to assess danger of rocks regarding friction inflammation of air-methane mixture, which consists in the fact that rock samples are taken, their strength and content of silicon dioxide are determined, and then tests are carried out at test bench danger of friction sparking. In order to perform test, explosive mixture is formed in test bench, and nominal cutting speed is increased 1.5 times. If at hardness of rocks f from 3 and content of silicon dioxide up to 30% no inflammations were observed and no friction sparks were produced, then rock is considered safe. If at hardness of rock from 3 to 5 and silicon dioxide content from 30 to 50% with availability of friction sparks with temperature of up to 300°C and absence of inflammations, rock is considered as spark-hazardous of the 1st extent, and if their temperature is more than 300°C - to spark-hazardous of the 2nd extent. If at least one inflammation occurred from friction sparks, rock is considered highly explosive. Use of suggested method makes it possible to increase safety of cleaning and preparatory works.
EFFECT: development of fundamentals for rock classification procedure by danger of friction inflammation in case of their damage with account of their physical-mechanical properties.
FIELD: mining, particularly to depress dust generated during rock milling in enterprises of mining and smelting, coal, construction industries.
SUBSTANCE: plant comprises control unit, high-pressure source, siphon-type vessels filled with ionized water having opposite polarities, spraying jets, which generate fine spray, electromagnetically driven pneumatic and hydraulic valves, pressurizing and purging air channels, water pipelines, coupling members for air and water pipelines and control circuits.
EFFECT: increased dust depression efficiency.
FIELD: mining industry, particularly to catch dust generated by machines and/or rigs in mines and tunnels.
SUBSTANCE: dust catcher comprises body with precipitation member formed as demister comprising moistening nozzles and drip catching means. Fan with drive is arranged near inlet/outlet side thereof. Moistening nozzles located in front of the demister in air flow direction are made as spaced multijet nozzles having separate sprayers, which form common sprayed curtain. The fan is installed in cleaned gas flow downstream the demister and drip catching means. The fan is arranged in case connected to dust catcher body. Demister is installed in contaminated air flow at inlet side and is arranged in inclined position. Upper edge thereof projects relatively lower edge. Air deflectors are arranged between the demister and drip catching means. Bottom sheet is inclined towards drip catching means. Multijet nozzles project towards contaminated air flow and are connected to load-bearing frame obliquely installed in accordance with demister inclination angle. Dust catcher is provided with separate vessels for additives, which pass through metering device into water-pipe. Mixer connected to water-pipe or built in water-pipe is installed downstream the metering device. Spraying device is arranged in front of moistening nozzles and demister with drip catching means. Spraying device comprises spraying heads, which create water mist and is connected with water source or with water-pipe and metering device with mixer. Dust-contaminated air flow is mixed with water mist and then the obtained sludge is gathered. Moist air is dried by water droplet separation and then the dried air is introduced in cleaned gas flow. Gases generated as a result of explosion are laden with water mist preliminarily mixed with additives, which create ecologically safe compositions with nitrose or similar gases formed during explosion.
EFFECT: increased operational efficiency and reduced dust catcher size.
20 cl, 8 dwg
FIELD: mining industry, particularly means or methods for preventing, binding, depositing, or removing dust and preventing explosions or fires.
SUBSTANCE: method involves treating dust-and-gas cloud with finely-dispersed ionized liquid, for instance with water, with the use of sprinkling plants alternately arranged so that ions of liquid spays generated by plants have opposite charges. The sprinkling plants are located outside zone of possible plant damage or are protected against explosion action. Sequence of plant alternation, ionicity, liquid quantity and liquid spraying pattern are determined from tests and calculations based on particular pit or underground mine blasting conditions.
EFFECT: reduced time of particle coagulation on liquid droplets and time of particle precipitation, possibility to reduce dust cloud propagation.
2 cl, 2 dwg
FIELD: mining, particularly methods and devices to prevent dust generation in tailing pit benches by moistening thereof with water or liquid binding agent.
SUBSTANCE: device comprises self-moving vehicle, for instance pontoon water craft, provided with pump, vessel for reagent, hydraulic monitor, unit with executive tool for channel forming in bank area and isolated power generating plant. Above mechanisms are installed on water craft deck. Hydraulic monitor may rotate in horizontal and vertical planes. Drives of all mechanisms are linked with the power generating plant. Executive tool is installed below water craft floating line. Vessel for reagent is provided with proportioning device. Dust control method involves initially installing the water craft on tailing pit water surface; directing the water craft towards bank to area to be sprayed, in which working tool forms channel for water craft movement; pumping water from tailing pit into hydraulic monitor; adding reagent from vessel to water with the use of proportioning device and spraying the obtained liquid over dust-forming area. Water from tailing pit is used for above spraying operation and for water craft movement.
EFFECT: increased dust control efficiency.
2 cl, 2 dwg
SUBSTANCE: method of development of thick steep coal bed in straps downstream includes preparation of extraction pillar by driving of conveyor and ventilation gates, preparation of extraction line by driving flank and near chutes along dip line near layer soil from conveyor to ventilation gate along both sides of line, driving of mounting chamber near ventilation gate, support pillar being left, mounting of expandable back-connected overlap of support in it, coal layer mining in mining face by development machine with actuating element designed as horizontal directed drum with cutters, forced transportation of coal along face by self-propelling car and ventilation of cleaning face due to mine ventilating pressure drop. Soil of each layer is tapered not exceeding slope angle allowed for development machine and self-propelling car, coal is transported along mining face by self-propelling car to flank chute when slope of extracted layer is towards near chute, or to near coal chute when slope of extracted layer is towards flank chute. Change in direction of layer slope is performed when self-propelling car and development machine are changed over and turned in chamber, which is driven outside mining line and used again during extraction of neighbouring mining line with balanced orientation of extracted layers.
EFFECT: invention allows increasing efficiency and safety of extraction.
SUBSTANCE: method involves preparation of extraction pillar with gangways, preparation of extraction strip - with end and neighbouring slopes along line of dip at formation soil between gangways, on both sides of strip, construction of erection chamber and erection in it of sections of modular support, mechanised slice mining of coal in mining face, forced transportation of coal along working face and ventilation of mining face due to common borehole depression. Mechanised extraction is performed with combined front-action machine with actuating element made in the form of horizontally oriented drum with cutters. Soil of each formation has the gradient of not more than allowable inclination angle for combined machine and self-propelled car. Coal transportation along the working face is performed using a self-propelled car to the end slope, at the gradient of extracted coal towards the neighbouring slope, or to the neighbouring coal lowering slope, at gradient of extracted coal towards end slope. Change of formation gradient direction is performed after the places of location of self-propelled car and combined machine are changed and they are turned in the chamber which is performed beyond the extraction strip and used again at extraction of neighbouring extraction strip with symmetric orientation of extracted formations. Coal pillars remaining within the limits of extraction strip are removed with cutting actuating elements of modular supports.
EFFECT: invention allows increasing efficiency and safety of coal extraction.
SUBSTANCE: method of working crossing by working face includes the following stages: performance of two extraction galleries and working, passed between them with formation footwalling; formation of artificial ground with floor installation for equipment movement and working crossing by working face with formation footwalling. Note that pneumatic cogs are delivered into the said working between extraction gates on which U-shaped wooden floor is laid. As working face approaches the working pneumatic cogs are filled with compressed air and the floor is lifted, after the working face crosses the working the pneumatic cogs are unloaded, the floor is descended to the ground of working and pneumatic cogs are extracted into extraction working.
EFFECT: increase of artificial ground creation efficiency in the working crossed by working face.
SUBSTANCE: method involves detailed study of composition of coal beds, separation of valuable components subject to incidental extraction, development of coal bed, conversion of valuable components to chemical compounds so that their physical state changes, extraction of those compounds and recovery of valuable components. Coal with commercial content of platinum or elements of platinum group of metals is extracted from coal bed selectively and delivered to the energy producing enterprise individually; it is enriched in coal pulverisation system till ore concentrate is obtained, and then it is mixed with fluorite dust and briquetted. Briquettes are burnt in grate-fired furnace of the boiler so that gaseous combustion products and solid residues are formed and removed. Removal of elements of platinum group of metals is performed by abrupt cooling of gaseous combustion products of briquettes to the temperature below condensation temperature of extracted components with their dilution in hydraulic cyclone water, and solid residues are used as ore for obtaining other valuable components.
EFFECT: increasing efficiency of complex development of power-generating coal deposit.
SUBSTANCE: method includes development of a coal bed, using hydromining, powered support, face-end supports and tight bridges. At the same time simultaneously with coal extraction, its transportation and grinding, methane is sucked out along the face and in couplings with the mining face, via nozzles. To do repair works, workers enter the mining face via doors installed in movable tight bridges equipped with pneumatic cushions along the perimetre.
EFFECT: improved safety of mining works.
SUBSTANCE: when developing thin and middle seams by a stall-and-brest system leaving rock in a mine, at first a complex of panel and level excavations is carried out, a mine section is prepared by pilot method of a transport entry driving in the beginning in the form of a coal chamber. Then the chamber section is increased up to the entry with due to excavation of bearing strata at both sides of the mine section. Then cavities are drilled in the sight pillar below the transport entry at the angle to it, where rock of previous explosion of bearing strata is laid. Chamber driving is carried out simultaneously with driving of a throughcut in a coal massif and arranged at the lower border of the future coal and rock strip under the transport entry, connecting both mines with crosscuts.
EFFECT: improved reliability of flow chart of long faces preparation leaving rock from mining in place of its production.
3 cl, 1 dwg
SUBSTANCE: at full development of gently sloping coal beds with power-driven systems without any preliminary driving of preparatory mine workings there first developed is the bed with two short faces as per continuous development system. For long face there formed are preparatory mine workings in the worked-out area after short faces by laying the strip of filling mixture. Reinforcement of working excavation of short faces by means of anchor support installed between the working face and powered support sections is performed only on end sections equal to the width of the preparatory mine workings being formed. Cutting-off support is installed in the worked-out space of short faces after sections of powered support along the boundary of the preparatory mine workings being formed. The worked-out space is covered with air-tight cloth along the lines of cutting-off support. Then, further development of long face is performed in backward direction with damping of the preparatory mine workings that have already been formed. Filling of the worked-out area is performed only between cutting-off support lines by destructing the roof in this section, and length of short faces is determined by mathematical formula.
EFFECT: providing high formation rates of preparatory mine workings.
SUBSTANCE: The invention relates to mining, in particular, to methods for development of thick flat coal seam. When thick flat coal seam with stable top is developed, several cuts are taken from the side of the seam rise, beginning with the air heading. This part of the extraction chamber is deepened. Then several cuts are taken from the seam pitch in the same direction, Then the extraction chamber is deepened and cuts are taken from the seam rise side in the layer close to its ground. After that the extraction chamber is deepened again and cuts are taken from the seam pitch side. Furthermore, the air headings and transport headings are made with an angle to the horizon line, oriented down, it allows the use of conveyor transport. The extraction chambers are made with an angle to the horizon line, oriented up and allowing the use of self-propelled car. The diagonal cut is taken up or down with an angle allowing the use of frontal mining machine. The extraction chamber height in the layer close to seam top is calculated according to the formula.
EFFECT: increased efficiency of thick flat coal seam development along the whole angle of flat seam bedding.
SUBSTANCE: method includes identification of two bed areas on a contoured mining field, withdrawal of coal using mechanised complexes, periodical measurements of daily average volumes of produced coal, air consumption and methane concentrations in it at the outlet from the mining face. One of the identified bed areas is drilled around with bed wells. Linear dependencies are detected on the identified areas between intensity of methane release and daily average volumes of produced coal, as well as produced coal volumes. Air consumption and methane concentrations in the bed areas are measured in the intervals between outer borders of natural drainage zones of coal massifs by assembly chambers and borders of bed areas for the period that precedes the main roof setting, and extent of well mining of the bed is assessed with the following coefficient value: where Ke - extent of well mining of the bed, unit fractions; K and Ka - coefficients at the parameter of daily average volumes of produced coal that are within the linear dependencies established in the identified areas between methane release intensity and daily average volumes of produced coal, accordingly on bed areas that are either mined or not mined with the help of wells, unit fractions.
EFFECT: higher efficiency of coal bed preparation for mining.
SUBSTANCE: during underground mining of coal beds a coal bed is divided into columns, column development is carried out by arrangement of two parallel development openings, leaving a coal sight pillar between them, serially the columns are treated with long faces for complete roof rock slide in the developed space. Further the coal sight pillar is mined at the same line with the long wall face, one development opening located between the mined and the developed columns is suppressed following the face, pipes are laid coaxially on the foot of the suppressed development opening without leaving gaps between pipes. Besides, prior to suppression of the development opening arranged between the developed and mined columns, in the edge part of the coal bed, arranged at the side of an untouched massif from the suppressed development opening there are blast holes drilled, through which solutions of antipyrogenes are injected into the coal bed. The minimum permissible width of the coal bed edge part zone treated with solutions of antipyrogenes is accepted as equal to the depth of spreading into the edge part of the bed in the area with higher intensity of cracking.
EFFECT: reduced risk of coal self-ignition in edge zones of the bed that are adjacent to the mined space.
FIELD: mining industry.
SUBSTANCE: method includes driving of layer transporting and ventilation mines along soil and ceiling of bed, in massive and in extracted space, cutting of cleaning mines in cross-section of bed at angle of 27°, mechanized delivery of coal along bed mines to coal furnaces and vertical dropping of coal to furnaces. Extraction of slanted transverse bed is performed along bed diagonals having direction to horizon at angle of 27°, to provide for free sliding of coal without degradation. Delivery of coal from cleaning mine placed at angle of 60° to layer mine, to back field mine is performed by self-delivery from any place of extraction field along layer mine, field coal-lowering mine and field slanting coal furnace, being at angle of 27° to horizon. Field slanted coal furnaces are placed at distance from one another along 20 m normal. Field coal mines in form of fans of three mines are connected on field slanted coal furnaces at distance of fan start from one another of 60 m with output of mines ends to each layer mine of group of three above-lying slanted-transverse layers for whole diagonal length of extraction field at distance between mines outputs along layer soil of 60 m. Ceiling of cleaning mines may be supported without load, utilizing mechanical traction on the side of ventilation furnaces for pressing moveable support tool to layer ceiling.
EFFECT: higher efficiency.
2 cl, 3 dwg