Method for controlling ceiling in lava during extraction of gas-bearing coal beds

FIELD: mining industry.

SUBSTANCE: method includes determining gas potential of extracted bed in limits of extraction area and monitoring of relative gas-escape from extracted bed and of extracted coal with withdrawal of lava from mounting chamber. Value of primary step of main ceiling destruction is set on basis of distance from mounting chamber to point of minimal gas-kinetic coefficient values closest to it, as which coefficient relation of relative gas-escape to bed gas potential bed is taken. Value of destruction step is determined from mathematical relation, considering distance from mounting chamber to closest point of said coefficient minimal values. It is possible to construct a graph of dependence of gas-kinetic coefficient from distance between face and mounting chamber. Portions of extraction field, wherein periodical changes of gas-kinetic coefficient are observed, are related to areas of geological irregularities influence. On basis of decrease of amplitude of maximal oscillations of gas-kinetic coefficient displacement of face to exit of geological irregularities area is detected, and on basis of increase - entrance therein.

EFFECT: higher precision, higher speed of operation.

2 cl, 3 dwg

 

The invention relates to mining, namely the underground mining of coal seams by means of longwall mining with a complete collapse of the roof, and can be used to determine the primary step of the collapse of the main roof when practicing gentle gas-bearing formations, when designing parameters excavation sites, safe operation of facilities on the undermined mountain ranges, etc.

Known way to control roof faces sloping layers, namely, what is the unloading of the rock cover by loosening the array ahead of the stope with a gradual increase in the depth of discharge from the minimum value on the plot lava adjacent to the worked-out space, up to the maximum on the plot of lava adjacent to pristine array (USSR author's certificate No. 1178897, CL E 21 41/04, published 15.09.85, BI No. 34). The main disadvantage of this method is the high volume of work on the weakening of the array and the danger of vyvaloobrazovanie.

Known way to control the collapse of the roof rocks, based on the definition of the primary and subsequent steps caving on the basis of complex geological and mining-technological factors (Interim guidance on the calculation of primary and subsequent steps of rock collapse of crawl is in the development of coal seams long poles along the strike in terms of Kuzbass. - Kemerovo, VostNII, 1973, p.3-9). The values of the primary and subsequent steps of the collapse of the roof is determined by a mathematical formula based on the following indicators: power and the angle of incidence of the reservoir, the length of the lava, feature lining, mechanical properties of coal and rock roof, power breeds the immediate roof, the size of the bundle of roof rocks, etc. the Main disadvantage of the method of controlling the collapse of the roof using primary and subsequent steps caving, calculated on the basis of physico-mechanical properties of the coal seam and roof rocks, and taking into account individual performance stope and characteristics of the support, is the low accuracy of the obtained results, since the desired value is determined by empirical dependencies part of which is installed in radically different mining conditions.

Proposed method of control roof in love with the development of gas-bearing coal seams by means of longwall mining, including the definition of the primary step of roof collapse. The difference of the proposed method is what determines gas potential of the mined seam within the extraction column and monitor the relative gas as waste lava from the mounting chamber, and the magnitude of the primary step of the collapse of the main roof set the distance from mounting the camera to the nearest to her point of minimum values gaskinetic indicator, which take the relative gas to the gas potential of the reservoir as its development, with the magnitude of the initial step of collapse is determined by the mathematical dependencies:

Lso=2l,

where Lso- the value of the primary step of the collapse of the main roof, m; l - distance from mounting the camera to the nearest to her point of minimum values gaskinetic index, m

The difference is that they build a graph of gaskinetic indicator of the distance between the bottom and the mounting chamber, and the parts of the extraction field, where there are periodic changes of values gaskinetic indicator, refer to the zones of influence of geological faults, and a decrease in the amplitude of the maximum deviation, as podvigina bottom shows the output from the geological zone of disturbance, and increase - on the entrance.

Thus, the subject invention is a method of controlling the main roof when practicing gentle gas-bearing coal seams with a complete collapse of the roof, taking into account the influence of the process of unloading and rock movement of the roof on gassing in the bottom space. The method allows with high accuracy and quickly, i.e. as podvigina stope, to determine the step of the collapse of the main roof and the AOR is s influence of geological disturbances on the dynamics of outgassing from the mined seam, that gives the opportunity to take timely measures to reduce the accident rate and wood thrown rock failures, extraction of coal at the working face and sahusilawane excavation of the site.

The invention is illustrated by the example of its implementation and the drawing, in which figure 1 shows the excavation site in the optimization process, figure 2-change gaskinetic indicator of the reservoir when the waste stope from the mounting chamber outside the influence of geological disturbances, figure 3 - the same, in the zone of influence of geological disturbance of the array.

For the implementation of the method requires the following data for excavation area:

- geological data mining pole: gas χash coal Andwith, humidity W;

- mining technology: distance from mounting the camera to the line stope L, m; daily coal production And t/day; daily inflow of gas to the working site I, m3/day. Based on the above data to determine the distribution of the gas potential of the developed layer of Gpalong the length of the extraction column by bringing the values of its gas to the ton of coal produced, ie,

It is established that within the extraction column gas potential varies from 13.1 m3/t to 15.1 m3/t (contour 1).

According to the results of Moni is oringa as waste stope 2 from the mounting chamber 3 is measured metanavigation on the excavation site I and production volumes And, which calculate the relative methane emission rate:

According to the obtained values determine gaskinetic indicator of the developed layer of the Pp- the value of the ratio of the actual relative outgassing from the mined seam and broken coal to gas potential of the developed layer, i.e:

Obtained along the length L of exhaust interval column values of Rpis applied, starting from the mounting chamber 3, on a plane with the y-axis L and the x-axis Rp. With a steady gradient of change of the index Rpthe resulting system points are approximated, for example, a monotonic dependence and receive schedule 4. In the case of a pronounced periodicity of changes in Ppapproximate minimum values in the periods and receive schedule 5, and then determine the maximum amplitude of deviations ΔP1and ΔP2.

From the graphs 4 and 5 shows that when mining a gentle layers of long poles with a complete collapse of the roof in the first meters of waste stope 2 from the mounting of the camera 3 relative methane emission rate surpasses the natural gas potential of the developed layer, indicating a large area of its discharge from the mountain davlenia.patientov stresses ahead of the face changes gaskinetic formation characteristics in a sufficiently large region of formation of the gas flows in the direction of the bottom space. However, as the departure from the mounting chamber increase the load on the bottom part of the reservoir from the undermined rocks and its permeability decreases rapidly, which is reflected in the fact that decrease the amount of gaskinetic indicator. This lower limit is defined by a set of geomechanical and gaskinetic properties of the array.

Experimentally established that outside the zones of influence of geological faults to minimize the magnitude of the gaskinetic indicator Pp=0,2-0,4 (figure 4) is to remove from the mounting face of the camera, close the half pitch of the collapse of the main roof, ie,

Lso=2l,

where l is the distance from mounting the camera to the nearest to it is the minimum of the values gaskinetic index.

The zone of influence of geological faults (figure 5) is characterized by the smaller value of l and a significant frequency changes gaskinetic metric on the interval podvigina slaughter, corresponding to the length of the initial collapse of the main roof in the absence of disturbances. Under these conditions, gaskinetic indicator has several peaks, indicating the uneven process of forming a mechanical load on the bottom part of the reservoir undermined rock with a corresponding change of the filtration characteristics. However, in the quiet conditions step initial collapse of the main roof is predicted quite clearly. Moreover, it is shown that if the amplitude of the maximum deviation decreases (ΔP1>ΔP2), the slaughter moves out of the zone of influence of geological disturbances, and if increases (ΔP2>ΔP1), the longwall face is in the area of geological disturbance.

Timely and accurate definition of the values of the primary step of collapse and the main gaskinetic characteristics of the mined seam, including taking into account the geological disturbance, allows you to take prompt measures to control the roof and gassing at the excavation site, warning of an emergency.

In the above example, in the undisturbed zone at a distance from the mounting chamber to stabilize gaskinetic indicator Ppat 0.25, we have l=18,5 m, therefore, the value of the primary step of the collapse will be Lso=37m, and in the zone of influence of geological violations at l=9 m, respectively, Lso=18 m have ΔP1=0,42 D.%>ΔP2=0,22 D. unit (hereinafter, D. units - share units)that indicates a movement of the face to the exit from the zone of influence of geological disturbances. The value of the relative methane release from the mined seam and broken coal will be:

- outside the influence of the geological violation of 0.25 D. unit from the gas potential of the reservoir;

- in the area VL is the impact of geological disturbances 0,34 D. unit from the gas potential of the reservoir with a further reduction to 0.25 D. unit with an approximation to the minimum values gaskinetic indicator outside the influence of geological disturbances (Pmin).

On removal of the face from the mounting chamber is substantially greater than the primary step of the collapse of the main roof, the unloading area and displacement of surrounding rocks reach formations of satellites, and the value of the gaskinetic index increases rapidly, indicating inclusion in the process of more powerful sources of gas, rather than developing the layer.

Used to forecast the primary steps of the collapse of the gaskinetic information likewise can serve to clarify the next steps of the collapse, as well as the dynamics of metrobility excavation of the site and other risk indicators without conducting time-consuming geophysical research.

1. The method of controlling the roof in love with the development of gas-bearing coal seams, including the definition of the primary step of the collapse of the roof, characterized in that to determine the gas potential of the mined seam within the excavation area and monitor the relative outgassing from the mined seam and broken coal as waste lava from the mounting chamber, and the magnitude of the primary step of the collapse of the main roof set on Russ is the nformation from mounting the camera to the nearest to her point of minimum values gaskinetic indicator, which take the relative gas to the gas potential of the reservoir as its development, with a step size of collapse is determined by the mathematical dependencies

Lso=2l,

where Lso- the value of the primary step of the collapse of the main roof, m;

l - distance from mounting the camera to the nearest to her point of minimum values gaskinetic index, m

2. The method according to claim 1, characterized in that build a dependency graph gaskinetic indicator of the distance to the mounting of the camera and where there are periodic changes of values gaskinetic indicator, refer to the zones of influence of geological faults, and a decrease in the amplitude of the maximum deviations gaskinetic indicator as podvigina bottom shows the movement of the stope to the exit zone of the geological impacts, and improvement of the entrance.



 

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8 cl, 5 dwg

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