CN102518471A - Rock burst energy releasing method of roadway of high stress area in coal mine - Google Patents

Abstract

The invention discloses a rock burst energy releasing method of a roadway of a high stress area in coal mine. The method comprises the following steps of: firstly, delimiting a high stress area as a rock burst danger area, then delimiting a dispersing releasing zone in the high stress area, arranging a diameter blasting pressure-releasing hole on a delimited fracture surface and performing a first blasting to release pressure, finally drilling a hole on each of coal pillars at two sides of the dispersing releasing zone and performing a second deep hole blasting, and further producing fissure zones on the coal to fully release and disperse the energy. According to the invention, by producing an inner pressure releasing zone on the high stress coal and performing blasting to destroy the coal pillars, a large dispersing releasing zone is produced, the local stress distribution is changed, a shock-free isolation zone is artificially produced, the range of releasing energy is reduced and the burst danger is fundamentally reduced.

Description

High stress areas tunnel, colliery bump energy method for releasing

Technical field

The invention belongs to the coal mining technical field.

Background technology

Got into since 21st century; Comprise China; South Africa, Canada, Ukraine, Germany, Australia, Poland, Russia, the U.S., etc. a plurality of countries and regions the bump phenomenon has appearred in coal mining, caused the loss of huge personnel and equipment.Along with the increase of the pit mining degree of depth, the expansion of limit of mining, the fringe conditions of exploitation complicated, the control of bump is more and more serious, has become a generally acknowledged world-class difficult problem.Dangerous continuous the increasing that the deep-well tunnel bump causes, the control of deep-well tunnel bump does not at present have essence to distinguish with the conventional method of preventing and treating, and mainly takes to separate the danger measure, comprises measures such as drilling and blasting release, boring release, top board processing.Along with mining depth increases; These conventional measures are difficult to reach the purpose that reduces the danger of burst degree in itself, owing to there are shortcomings such as the release scope of operating difficulties, manufacturing is little, cause heavily stressed transfer not in place simultaneously; Energy discharges insufficient; Bump is difficult to control, and the bigger energy release of rank takes place easily, causes great loss.When there is the unusual region of high stress in the tunnel, when implementing conventional drilling and blasting, just creep into very difficulty with the boring release, it is relatively poor to separate the danger effect.Therefore the control of the tunnel way of escape bump under heavily stressed, the big buried depth condition; Up to the present also fundamentally do not reach the degree of control fully, invent a kind of technical method of dispersion principle control bump that adopts coal mine safety management is significant.

Summary of the invention

The objective of the invention is to control the problem of impact, propose the effective ways that a kind of bump energy " dispersion " discharges to the local solution danger measure that has high stress areas in the present deep tunnel bump control.

The technical scheme that the present invention takes is: high stress areas tunnel, a kind of colliery bump energy method for releasing is characterized in that step is following;

The first step: the delineation high stress areas is as the bump deathtrap

The way of escape zone of digging laneway in the dangerous coal seam of bump; Through analogy, face the analysis and the judgement of stope bump presentation attributes mutually; Adopt monitoring means such as drilling cuttings method to carry out the scene simultaneously and detect, mark off high stress areas, as the control key area of bump;

Second one: the 42mm large diameter, deep borehole destroys the coal seam, produces the dispersion charge releasing belt

Way of escape high stress areas in the tunnel, group is every along the tunnel draws a circle to approve out cross-sectional area 6-8 square dispersion charge releasing belt at a distance from 25-30m, the unloading pressure by blasting hole of placement diameter 42mm on the section of delineation; The unloading pressure by blasting hole is quincuncial arrangement, pitch of holes 0.2-0.5m, hole depth 6.0-7.0m; The end one array pitch roadway floor, 1.0～1.3m, boring is perpendicular in the lane, 0～3 ° at the elevation angle; Carry out deep hole blasting after the boring, loaded length 2.0-3.0m evenly arranges the detonator of 2-3 parallel connection in the hole; The line of connecting outside the hole, per two hole once detonations; Give off energy;

The 3rd step: after giving off energy; Disperseing the hole that distance disperses the 2.0m place of charge releasing belt to bore a diameter 42mm, hole depth 6.0-7.0m again on the coal column of charge releasing belt both sides to carry out the secondary deep hole blasting again; On coal body, further make fissure zone, energy is fully discharged dispersion.

Good effect of the present invention is:

Through in the high-stress coal manufacturing, unloading pressure zone, and implement blasting technique, coal column is destroyed; Produce big dispersion charge releasing belt, changed the local stress distribution, the people does not have the isolation strip of impact for producing; Exergonic scope is reduced, fundamentally reduce shock hazard.

Description of drawings

Fig. 1 is the deathtrap plan view;

Fig. 2 is that dispersion hole is arranged sketch map;

Fig. 3 is borehole sections figure.

The specific embodiment

Below in conjunction with description of drawings enforcement of the present invention.

The first step: before certain working face mining; At first carry out the delimitation of bump deathtrap, in the way of escape zone of the dangerous coal seam of bump driving, through analogy, face analysis, the judgement of stope bump presentation attributes mutually; Adopting monitoring means such as drilling cuttings method to carry out the scene simultaneously detects; Mark off high stress areas, according to the power of stress distribution, as the control key area of bump; Fig. 1 is seen in the zone that delineation is the most dangerous.

Second step: the 42mm large diameter, deep borehole destroys the coal seam, produces the dispersion charge releasing belt

Way of escape high stress areas in the tunnel, group is every along the tunnel draws a circle to approve out cross-sectional area 6-8 square dispersion charge releasing belt at a distance from 25-30m, the unloading pressure by blasting hole of placement diameter 42mm on the section of delineation; The unloading pressure by blasting hole is quincuncial arrangement, pitch of holes 0.2-0.5m, hole depth 6.0-7.0m; The end one array pitch roadway floor, 1.0～1.3m, boring is perpendicular in the lane, 0～3 ° at the elevation angle; Carry out deep hole blasting after the boring, loaded length 2.0-3.0m evenly arranges the detonator of 2-3 parallel connection in the hole; The line of connecting outside the hole, per 2 hole once detonations; Give off energy;

The 3rd step: after giving off energy; Disperseing the hole (see figure 3) that distance disperses the 2.0m place of charge releasing belt to bore a diameter 42mm, hole depth 6.0-7.0m again on the coal column of charge releasing belt both sides to carry out the secondary deep hole blasting again; On coal body, further make fissure zone, energy is fully discharged dispersion.

Claims (1)

1. high stress areas tunnel, colliery bump energy method for releasing is characterized in that step is following;

The first step: the delineation high stress areas is as the control key area of bump

The way of escape zone of digging laneway in the dangerous coal seam of bump; Through analogy, face the analysis and the judgement of stope bump presentation attributes mutually; Adopt monitoring means such as drilling cuttings method to carry out the scene simultaneously and detect, mark off high stress areas, as the control key area of bump;

Second one: the 42mm large diameter, deep borehole destroys the coal seam, produces the dispersion charge releasing belt

Way of escape high stress areas in the tunnel, group is every along the tunnel draws a circle to approve out cross-sectional area 6-8 square dispersion charge releasing belt at a distance from 25-30m, the unloading pressure by blasting hole of placement diameter 42mm on the section of delineation; The unloading pressure by blasting hole is quincuncial arrangement, pitch of holes 0.2-0.5m, hole depth 6.0-7.0m; The end one array pitch roadway floor, 1.0～1.3m, boring is perpendicular in the lane, 0～3 ° at the elevation angle; Carry out deep hole blasting after the boring, loaded length 2.0-3.0m evenly arranges the detonator of 2-3 parallel connection in the hole; The line of connecting outside the hole, per two hole once detonations; Give off energy;

The 3rd step: after giving off energy; Disperseing the hole that distance disperses the 2.0m place of charge releasing belt to bore a diameter 42mm, hole depth 6.0-7.0m again on the coal column of charge releasing belt both sides to carry out the secondary deep hole blasting again; On coal body, further make fissure zone, energy is fully discharged dispersion.

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