RU1774024C - Method of preventing sudden outcrops in preliminary drifts - Google Patents

Abstract

The invention relates to mining and may used in the development and opening of outburst coal seams and in the maintenance of preparatory workings. The goal is to increase the safety of mining operations by increasing the degassing efficiency of the gas saturation region of the rocks. Before the preparatory mining, the mass of the rocks and the compaction region of the lateral rocks and the interface between the OH and the compaction region are set in the array and the degassing wells are drilled beyond the boundary OH and compaction areas in the direction of nearby formations (BP) along the entire length of OH rocks with gas. Determine the distance to the BP, the distance from the cross section of the mine to the OH interface and the compaction region, depending on the radius of the cross section of the preparatory mine, the gas pressure in the PS soil and at the OH interface and the compaction region, the air pressure in the mine, and rock permeability factors in OH coal with gas and in the area of compaction of the side rocks. 3 ill. with

Description

The invention relates to mining, and can be used in the development of outburst coal seams.

Figure 1 - position of the host rocks during the ejection period; in Fig.2 - the location of the degassing wells; in Fig.3 - section aa in Fig.2.

The method is carried out as follows.

Preparatory development — the drift passes through formation 2 having a nearby non-opening companion formation 1 satellite 3 (Fig. 1). The presence of a working hole 1 causes a subsidence of the existing rocks to subside, as a result of which the nearby satellite layer 3 is unloaded, gas is released, and a region 4 is formed in the host rocks.

in which the rocks are saturated with high-pressure gas.

A part of the enclosing rocks forms a compacted rock region 5 surrounding the region 4, and a part of the region 5 is located between the region 4 and the excavation 1, to prevent the degradation of the region 5. Between the region 4 and the region 5 there is a boundary between the regions 6. The enclosing rocks located above the excavation gradually settle until a large block 8, which hangs over the mine 1, is found in the sedimenting layer of rocks 7; Generation 1, as it moves, produces a block 8, which suddenly settles down to the mine, forming a fault 9 over the formation 2 over the formation 2 domain 5 compacted rock. This time-vl XI b. ABOUT

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4

scrap 9 serves as an intensive penetration of gas from region 4 to formation 2 in the direction indicated by arrows 10, and having a high dynamic pressure, the gas stream destroys coal and throws it into the mine, partially filling it.

To prevent a sudden release of the proposed method from the mine 1, as the mine moves, degassing wells 11 penetrate the gas saturation region (Fig. 2). Parts 12 of the wells 11 intersecting the dense rock region are sealed with a sealing solution to prevent gas leaks and air leaks. Through wells 11, gas from area 4 is discharged through a degassing pipe 13 to a surface or to a wellbore with an outgoing air stream. The distance to the boundary surface between regions 4 and 5 is determined by the formula:

r MP Rs # gs.l (1., ei MP PSTIKITPJFP J

rrp ef

where gn is the distance from the center of the contour of the cross section of the preparatory mine to the nearby formation;

gs is the radius of the cross section of the preparatory development;

Rn, Rgr — gas pressure in the soil of a nearby formation and at the interface between the regions of rock saturation with gas and rock compaction;

RS - air pressure in the mine;

Ki, "2 - rock permeability coefficients in the field of gas saturation and rock compaction;

1 - the base of natural logarithms.

Claims (1)

The claims A method for preventing sudden outbursts during preparatory workings, including setting to 0 5 0 5 0 the lychees of the areas of rock saturation with gas and compaction of the lateral rocks and the interface between these regions, drilling of degassing wells abroad of the boundary of these regions, determining the distance to a nearby formation, the radius of the cross-section of the preparatory mine, degassing the rock mass, characterized in that in order to increase the safety of lead mining operations, the degassing efficiency of the gas saturation region, wells are drilled in the direction of the nearby formation throughout the preparatory development, starting from production pressure, and the gas pressure in the soil of the nearby formation and at the interface between the regions of rock saturation with gas and compaction of the side rocks, the air pressure in the preparatory mine and the permeability coefficient of the rocks in the areas of gas saturation of the rocks, compaction of the side rocks, and the distance from the center of the contour of the cross section of the mine to the boundary between the regions of rock saturation with gas and compaction of the side rocks is determined by the formula fhrvk p Mnre.MPS-p) Ve where GN is the distance from the center of the contour of the cross section of the preparatory mine to the nearby formation; gs is the radius of the cross section of the preparatory development; PH Rgr is the gas pressure in the soil of a nearby formation and at the interface between the regions of rock saturation with gas and rock compaction, respectively; pc - air pressure in the mine; Ki.Ka are rock permeability coefficients in the areas of rock saturation with gas and compaction of the side rocks, respectively. AND  g ..UU.-ll.V-.tf 7 t Pue.f FIG. 2 Fig.Z