Grouting method for water-bearing horizon rock during vertical pit shaft building

FIELD: mining industry, particularly to protect mine workings against underground water ingress.

SUBSTANCE: method involves drilling injection wells along pit shaft perimeter; widening cracks by supplying high-pressure water and injecting grouting mortar in the cracks; additionally boring vertical preparation well in pit shaft center. Cracks are widened by feeding water and then air or only water in vertical preparation well. Water and air are supplied under pressure lesser than pressure of hydraulic rock fracturing. Grouting mortar is injected in cracks by forcing thereof through injection wells immediately after finishing of feeding water or air in vertical preparation well. Cryogenic gel is used as the grouting mortar. Cryogenic gel is foamed before injecting thereof in wells and foamed cryogenic gel is forced into cracks beyond the pit shaft perimeter by supplying compressed air in vertical preparation well. After leaving pit shaft as it is for grouting mortar setting time wells are sunk for the next grouting step depth and above operations are repeated up to reaching the lower boundary of pit shaft interval, wherein injection is performed under pressure exceeding that on previous step.

EFFECT: reduced labor inputs and material consumption along with increased efficiency of water suppression.

3 cl, 3 dwg, 1 ex

 

The invention relates to mining and is designed to protect the mines from inflows of groundwater.

Known methods of tunneling excavations in fractured rocks, including the drilling workings several rows of wells and pumping through them cement slurries, and the rows of wells have contour generation, through the bore of one series pump the cement slurry, and then through the hole of the other row - clay solution (A.S. USSR №757713, CL. E 21 D 1/16, 1978).

The disadvantages of this method are the necessity of drilling a large number of wells. In addition, this plugging is unable at once to achieve the quality of cementation, and therefore it is necessary again to drill and produce cement.

The closest technical solution is the way to plug rocks with heterogeneous fracture, including the drilling of the first series around the vertical shaft and forcing them in cement, drilling in the intervals between the holes of the first series of additional wells and forcing them initially water for expansion of thin wells, and then cement mortar (A.S. USSR №1456585, CL. E 21 D 1/16, 1987).

The disadvantages of this method are the high labor and material costs, due to the need of drilling Bo is isogo number of wells. In addition, there is provided an effective vodopoglaschenie due to the fact that cement cement mortars are not able to penetrate into small cracks and pores of the rock mass, and after solidification of the solution is prone to cracking when conducting blasting and possible subsequent deformation of the array during repeated temperature changes from positive to negative and Vice versa.

The technical problem solved by the invention is the reduction of labor and material costs while increasing the efficiency of stopping leaks.

This technical result is achieved in that in the method of backfill rock aquifers in the construction of vertical shafts, including the drilling of injection wells along the contour of the shaft, the extension of cracks by pressure feed water injection in well cement slurry, with each descending Zachodni repeat the cycle Globocnik and backfill, additional Buryats vertical preparatory hole in the center of the shaft, extend the crack by filing in the vertical preparation well under pressure, less fracturing of rocks, or first water then air, or water, is pumped into the cracks of cement mortar in the form of foam is of riages through its supply under pressure in a vertical injection wells immediately after the filing in the vertical preparatory hole or air, or water, press through foam cryogel on cracks beyond the contour of the shaft by injection under pressure of air in the vertical preparation of the well for each subsequent Zachodni deepen vertical injection and preparation well and are forcing under pressure, more than in the previous cycle.

In addition, the cryogel contains the following ingredients in the ratio, wt.%:

PVA (polyvinyl alcohol) - 3,

Boric acid - 0.5,

Water - 96,5.

In addition, the cryogel contains the following ingredients in the ratio, wt.%:

PVA (polyvinyl alcohol) and 5

NaCl - 11,

Water - 84.

The novelty of this solution is the extension of cracks by submitting to prep well under pressure less fracturing of rocks or first water then air or water before discharge into rock cement slurry. In addition, injection wells have the contour of the face, and one of the wells - preparatory - drilled at the center of the shaft, and as an injection in well cement slurry using cryogel. The cryogel used as a cement slurry before injection into wells froth. Punching cement slurry is performed by applying air under pressure in the preparatory hole pic the e injection of cement slurry. After a maturation period of the stiffening well deepen the step of tamping and repeat the whole cycle until the end of the interval plugging the barrel and the injection are under pressure, more than in the previous cycle.

The set of features of this technical solution is not identified from the patent documents and scientific and technical information that is indicative of inventive step of the claimed technical solution.

Drilling in the center of the shaft of the vertical preparation of wells for injection into an array of rocks agents (water-air or water), widening the cracks, and then cement slurry is foamed cryogel - reduces the amount of drilling and injection operations and thereby reduce labor and material costs. Plugging pattern along the perimeter of the outside of the barrel and the bottom of zagadki reduces the volume of cement works and also helps reduce labor and material costs.

A preliminary filing with the vertical preparation well under pressure, less fracturing of rocks, or first water then air or water before discharge into rock cement slurry leads to a more complete disclosure of the cracks in temporarely rocks that works on improving the efficiency of the process of plugging and SP which facilitates plugging pattern along the perimeter of the outside of the barrel, which leads to the reduction of material costs.

In addition, the discharge in the vertical preparation of the well cement slurry in the form of foamed cryogel leads to the formation of effective Vodopadnaya grouting curtain.

Studies have shown that with repeated temperature changes from positive to negative and Vice versa is used as a cement slurry waterproof cryogel does not change its strength. Since the plug does not require freezing of the solutions, and their rapid structure formation, the advantages of cryogels when plugging is the ability to gain the necessary strength and structure in a short time and soon the whole array, not just on the border with saline solutions. Cryogels, injected as a cement slurry in a mountain range, not able to mingle and interact with brines and at the same time, having a plastic viscosity, are not destroyed when conducting blasting and possible subsequent deformation of the array during repeated temperature changes from positive to negative and Vice versa.

The cryogel injected into wells in the expanded condition, retains all its properties, including the ability to not be mixed with brines, and at the same time, possessing plastic is Ascott, not destroyed when conducting blasting and possible subsequent deformation of the array during repeated temperature changes from positive to negative and Vice versa. In addition, preliminary foaming cryogel greatly reduces plugging of the solution and thus reducing material costs.

Punching foam cryogel by air injection through vertical preparatory hole, i.e. the formation of the grouting curtain by squeezing cement slurry air, leads to uniform distribution of cement slurry in rock cracks and pores in the rock mass and thus increases the efficiency of the waterproofing of vertical shafts in permafrost rocks.

Due to the fact that for each subsequent Zachodni deepen vertical injection and preparation well and are forcing under pressure, more than in the previous cycle, the new cycle cement works is filling the previously uncovered cracks. Thus, a new cycle plug Podunavlje, solidifies, filling small cracks and pores of the rocks.

The method is illustrated in Fig.1 - 3. In figure 1, 2 shows a diagram of the proposed method, a view in plan in figure 3 - the same, vertical RA is cut, where: 1 - shaft, 2 - vertical preparatory bore, 3 - injection wells located on the contour of the shaft, 4 - cement veil of frozen cryogel.

On bottom of shaft 1 cage barrel create a concrete pad. The contour of the shaft Buryats vertically estimated number of vertical injection wells 3 depth - step plug. Vertical preparatory hole 2 drilled at the center of the shaft. Through the vertical pre-production well # 2 pumped to a pressure lower than the hydraulic fracturing of rocks, the estimated volume of water, then air or only water. After the release of the air through the injection well 3, located on the contour of the shaft 1, to produce the injection of pre-foamed cryogel. At the end of the injection cryogel through the vertical preparation of the well pump estimated amount of air to penetrate. After a maturation period setting deepen all well the next step is to plug and repeat the cycle already under great pressure. The process is repeated until the end of the interval plugging shaft. If you geomechanical conditions of the mountain massif, waterproofing vertical shaft carried out in one step of tamping. In addition, if massif has a high vazduhoplovni is a resistant, waterproofing vertical excavations carried out through a single injection well 2 drilled in the center of the shaft 1. In this case, eliminating the need for drilling of 2 wells on the perimeter of the array, which further reduces the cost of implementation of this method. After the formation of the grouting curtain, well to purify from the gel and are experienced and discharge pumping test of the veil.

Example.

On bottom of shaft 1 create a concrete pad, which is required for isolation from vytachivanija cement slurry. The contour of the shaft, as close as possible to the border, the Buryats, the estimated number of vertical injection wells 3-8 wells to a depth of a step of tamping 25 m, which is determined in advance based on the available information about the fracture and hydrodynamic characteristics subject to plugging of the rocks. The number of injection wells 3 is calculated depending on the volume of the array and its geomechanical parameters (fracture of voidness, hydrostatic pressure, the tensile strength of the rock). The drilling is designed so that a limited number of injection wells eliminates the need for drilling a large number of wells and their location vertically eliminates the risk of interruption of the current systems is freezing. Vertical preparatory hole 2 drilled at the center of the shaft 1. Injection well 3, located on the perimeter of the face, sealcoat piping on the mouth. Along the perimeter of the shaft 1 Buryats 4 control vertical wells (figure 1 - 3 not specified) to the bottom of an aquifer and equip them with sensors. The implementation of the method of waterproofing vertical mine workings control using sensors in monitoring wells and geophysical methods. Through the vertical pre-production well # 2 pumped amount of buffer water, then air, preventing fracturing of rocks. After the release of the air through the injection well 3, located on the perimeter of the face, make the injection of the cryogel was prepared and foamed on the surface of the array. Ready source solution cryogel get a simple mixing in the total capacity or when jacking pumps through the mixer comprising: pre-dissolved in hot water (70 to 100° (C) a solution of polyvinyl alcohol - PVA and cross-linking agent is boric acid or NaCl. The cryogel contains the following ingredients in the ratio, wt.%: PVA (polyvinyl alcohol) - 3 boric acid - 0.5, water - 96,5. Or PVA (polyvinyl alcohol) - 5, NaCl - 11, water - 84. Injection solutions produce piston pump cementi ovocny units. Download cryogel ready solution foamed by mixing with the air coming from the compressor through a nozzle (mixers) or compressor booster devices.

Solutions cryogels with foaming - resistant foam. When cured form a viscous cellular structure and is able to withstand water filtration. Thus, despite the increase in the thickness of the grouting curtain, significantly (60-100 times) reduce the costs of the cement slurry and the cost of the work. Injection foam cryogels produced booster installation type UNB-125×BK. At the end of the injection foam cryogel through the vertical preparation of the well pump 2 estimated amount of air to penetrate. After the formation of the grouting curtain wells purify from cryogel and are experienced injection and pumping water for the test of the veil. The air purge is performed by the high pressure compressor. Injection foam cryogel grouting curtain will be formed along the contour of the shaft 1. The air injected through the vertical preparatory hole 2, filling in cracks and pores of the mountain massif inside the ring of injection wells 3, will not allow the solution foamed cryogel be distributed inside the ring grouting curtain 4. After a maturation period of shutiva the Oia (10-12 hours) deepen all of the wells on the next step of plugging (25 m) and repeat the cycle already under great pressure. The process is repeated until the end of the interval plugging the barrel. With each new cycle is filling the previously uncovered cracks. Thus, a new cycle plug Podunavlje, solidifies, filling small cracks and pores of the rocks. After the formation of the grouting curtain test experienced nagatanien and pumping water from injection wells 3, located along the contour of the bottom of the shaft.

Plugging rocks in the construction of vertical mining in permafrost soils as described above improves the efficiency of stopping leaks, reducing labor and material costs for its implementation.

1. Way to plug rock aquifers in the construction of vertical shafts, including the drilling of injection wells along the contour of the shaft, the extension of cracks by pressure feed water injection in well cement slurry, with each descending Zachodni repeat the cycle Globocnik and backfill, characterized in that it further Buryats vertical preparatory hole in the center of the shaft, extend the crack by filing in the vertical preparation well under pressure, less fracturing of the rocks or on the ale water, then air, or the water pump in the cracks of cement mortar in the form of foamed cryogel through its supply under pressure in injection wells immediately after the filing in the vertical preparatory hole or air, or water, press through foam cryogel on cracks beyond the contour of the shaft by injection under pressure of air in the vertical preparation of the well for each subsequent Zachodni deepen vertical injection and preparation well and are forcing under pressure greater than that in the previous cycle.

2. The method according to claim 1, wherein the cryogel contains the following ingredients in the ratio, wt.%:

PVA (polyvinyl alcohol)3
Boric acid0,5
Water96,5

3. The method according to claim 1, wherein the cryogel contains the following ingredients in the ratio, wt.%:

PVA (polyvinyl alcohol)5
NaCl11
Water84



 

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FIELD: mining industry, particularly to protect mine workings against underground water ingress.

SUBSTANCE: method involves drilling injection wells along pit shaft perimeter; widening cracks by supplying high-pressure water and injecting grouting mortar in the cracks; additionally boring vertical preparation well in pit shaft center. Cracks are widened by feeding water and then air or only water in vertical preparation well. Water and air are supplied under pressure lesser than pressure of hydraulic rock fracturing. Grouting mortar is injected in cracks by forcing thereof through injection wells immediately after finishing of feeding water or air in vertical preparation well. Cryogenic gel is used as the grouting mortar. Cryogenic gel is foamed before injecting thereof in wells and foamed cryogenic gel is forced into cracks beyond the pit shaft perimeter by supplying compressed air in vertical preparation well. After leaving pit shaft as it is for grouting mortar setting time wells are sunk for the next grouting step depth and above operations are repeated up to reaching the lower boundary of pit shaft interval, wherein injection is performed under pressure exceeding that on previous step.

EFFECT: reduced labor inputs and material consumption along with increased efficiency of water suppression.

3 cl, 3 dwg, 1 ex

FIELD: mining industry, particularly elimination of emergency situations.

SUBSTANCE: method involves closing borehole cross-section with extendable means; arranging predetermined volume of non-combustible material above the means, wherein the volume is determined from a given relation; discharging all non-combustible material in the borehole at a time and further distributing portions of non-combustible material having volumes of not less than volume of incoming water. Non-combustible material includes clay and pourable components which are laid in layers above the means, wherein clay volume is equal to pore volume of pourable component.

EFFECT: increased reliability of borehole sealing and water burst liquidation.

3 dwg, 1 ex

FIELD: construction.

SUBSTANCE: water-proofing sheet comprises three layers. The first layer provides mechanical strength of the sheet and is made of elastometer polyethylene of high strength and flexibility. The second layer is intermediate one, represents the connection between the first and second layers, and is made of foam plastic with closed pores. The third layer is made of a impermeable plastic material which possesses high resistance to breaking. The tensile strength, breaking elongation, and thickness of the sheet range from 24 MPa to 39 Mpa, from 550% to 900%, and 3 mm to 50 mm, respectively.

EFFECT: enhanced reliability.

5 cl, 2 dwg, 3 tbl

FIELD: mining industry.

SUBSTANCE: backfill fibrosolution consists of concrete, argil, fibers and water, as fibers solution contains synthetic filaments with diameter 0,1-0,15 mm and length 10-20 mm in amount of 10-20 kg for 1m3 of argil-cement mixture, subjected to electrification with induction of static electric charge.

EFFECT: possible backfill of extensive fractured systems with active influx of water, increased hardness of backfill material, decreased material costs of reinforcement of fractured rocks, removal of water influxes in mines.

2 ex

FIELD: mining, particularly mining and pit protection against underground water inflow in the case of open-pit kimberlite pipe and other mineral deposits development in subpermafrost horizon.

SUBSTANCE: method involves discharging water initially contained in deposit section to be developed and precipitation water from said deposit section; drilling injection wells around kimberlite pipe perimeter and performing explosions through regular system from pit bottom to create joined subvertical annular and subhorizontal rock fissured zones which have uniform fissures; supplying plugging materials therein and creating joined solid watertight diaphragms shaped as integral cups.

EFFECT: possibility to create watertight diaphragm, which protects deposit section to be developed against underground water ingress.

FIELD: mining and pit protection against underground water inflow in the case of open-pit kimberlite pipe and other mineral deposits development in subpermafrost horizon.

SUBSTANCE: method involves discharging water initially contained in deposit section to be developed and precipitation water from said deposit section; drilling injection wells around kimberlite pipe perimeter and from pit bottom; performing explosions in wells surrounding kimberlite pipe perimeter and carrying-out hydraulic fracturing from wells drilled from pit bottom to create jointed subvertical and subhorizontal rock fissured zones, which have uniform fissures; supplying plugging materials therein and creating joined solid watertight diaphragms shaped as integral cups.

EFFECT: possibility to create watertight diaphragm, which protects deposit section to be developed against underground water ingress.

FIELD: mining.

SUBSTANCE: method comprises leaving of massifs of minerals 14 between chambers 7-13, driven at extraction of potassium salt bed 1, and filling chambers with backfill material. Bores 6 are drilled from ground surface 5 to chambers; the bores are cased with tubes. Not soluble in water backfill material is supplied into chambers via bores 6 till chambers are filled for their complete height at a point of backfill material supply. The first to be filled are chambers 7 located at proximity to the underground water inrush zone 4 from the side of the bed rise 1 of potassium salt; thereafter filling of chambers 8-10 located below underground water inrush 4 is carried out. Not solved in water, hardening, backfill materials are supplied into chambers 7-13 via bores 6. If filed chambers driven along the course of bed chambers have considerable length, the distance between bores is determined from a calculated expression.

EFFECT: invention facilitates prevention of flooding of potassium mine and hazardous deformation of the earth surface at breaks of water protective strata and underground water inrushes into mine through water permeable cracks generated in water protective strata in areas of geological disturbances.

3 cl, 2 dwg

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