CN1664310A

CN1664310A - Control method for coal mine detached island coal pillar rock burst

Info

Publication number: CN1664310A
Application number: CN 200510011363
Authority: CN
Inventors: 潘立友; 杨慧珠
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2005-02-28
Filing date: 2005-02-28
Publication date: 2005-09-07

Abstract

The invention discloses a coal mine isolated island coal column impacting ground pressure controlling method that includes laneway collocation, demolishing pressure relief, the reinforcing of superficial of the up and down slots laneway, altering the deep physical of the laneway. The advantage is decreasing the impact fatalness, increasing the intensity of the gas, and enhancing the protection function for workers in the laneway.

Description

Control method for coal mine detached island coal pillar rock burst

Technical field

The invention belongs to the coal mining technical field.

Background technology

The control problem of bump is the difficult problem that world-class coal mining will solve, and especially the isolated island coal pillar mining usually follows damaging impact ground to press.The method of preventing and treating of the control of the bump of isolated island coal pillar mining and routine work face is basic identical at present, mainly in recovery process, takes to separate the danger measure in the high pressure stress district, comprises measures such as drilling and blasting release, boring release, top board explosion, base plate processing.These measures are in specific implementation process, owing to follow pushing to adopt of work plane, very dangerous between implementation period, the degree of separating danger is insufficient, causes stress raisers easily, and safety guarantee is not sure.Narrower when coal pillar width, when buried depth is big, when implementing drilling and blasting and boring release, creep into just very difficultly, it is relatively poor to separate the danger effect; Implement the coal-bed flooding method and be difficult to realize creeping into of water injecting drilling equally.Therefore controlling to of the bump of isolated island coal pillar mining also fundamentally do not reach the degree of control fully so far, and the degree of danger of its exploitation is bigger.

Goal of the invention

The objective of the invention is great deficiency, propose a kind of new bump control method at the local solution danger that exists in the present isolated island coal pillar mining bump control.

Technical scheme of the present invention is:

1, roadway arrangement

At first arrange coal cutting roadway in the low stress area of isolated island coal column, coal cutting roadway comprises other tunnels that crossheading, following crossheading and work plane are cut eye and satisfied production ventilation needs, leaves the wide coal column of 3.0-4.0 rice between coal cutting roadway and the goaf.

2, in-place blasting out release

Bore the unloading pressure by blasting hole every 3.0-4.0 rice on upper and lower crossheading rib, the aperture is generally 42 millimeters, and hole depth is coal seam thickness or span length 3 times, and the aperture is arranged in apart from base plate 1.0-1.3 rice is convenient to operation, and the boring direction elevation angle is generally 0-3 °; Bore pilot hole between per two holes, unloading pressure by blasting hole, pilot hole can be the large diameter hole greater than 100 millimeters, also can be arranged to 2-3 the small diameter bore identical with the unloading pressure by blasting bore dia; Load explosive and detonator then in the unloading pressure by blasting hole, shot depth is about 40% of a drilling depth, stops up with stemming, and line detonates, and the quick-fried pine of coal body, produces the crack between the Kong Yukong, realizes inner release.

3, upper and lower gate road helps the body superficial part to reinforce

A kind of scheme is: under the harder complete situation of upper and lower crossheading rib, rib spraying cement mortar is sealed, form the mortar spray-up, jetting thickness 5-10 centimetre.

Another kind of scheme is: help at upper and lower gate road under the situation of body soft broken, on rib, bore the chemical grouting hole, pitch-row 2.0-4.0 rice, hole depth 1.5-3.0 rice, Grouting Pipe slip casting in the hole is inserted in the boring back, injecting paste material is an organic polymer, and group's body is carried out chemosetting, makes rib form the chemical consolidation confining zone of 1.0-1.5 rice

4, to tunnel group body deep physical modification

After treating that tunnel group body superficial part is reinforced, on the rib of reinforcing, bore the physics injected hole, aperture, pitch-row are identical with the chemical grouting hole, also can in former chemical grouting hole, continue to creep into, brill is 3 times of lanewidth deeply, boring back slip casting in the coal body of in-place blasting out, injecting paste material is water glass-cement mixing slurries commonly used, has changed the mechanical property in group body deep after the slip casting.

Good effect of the present invention is: 1. reinforce and the deep physical modification by tunnel coal body superficial part, and unloading pressure by blasting, changed the mechanical property in coal body deep, made that having the coal body that impacts tendency is converted into weak impact tendency or impacts tendency, fundamentally reduces shock hazard.From rib to the deep modified zone, the intensity of coal body improves, and plays restriction to crushing of deep coal is bad, thereby coal mine detached island coal pillar rock burst is effectively controlled.

Description of drawings

Fig. 1 is the top plan view that roadway arrangement, unloading pressure by blasting hole are arranged, Fig. 2 is that coal body is reinforced schematic diagram, and Fig. 3 is that the rib of another embodiment is reinforced schematic diagram.

Among the figure: the last crossheading of 1-, 2-exploiting field coal column, the 3-pilot hole, the 4-work plane is cut eye, 5-goaf, 6-unloading pressure by blasting hole, crossheading under the 7-, 8-chemical grouting hole, 9-chemical consolidation confining zone, 10-physical modification district, 11-physics injected hole, 12-spray-up.

The specific embodiment

With certain coal seam thickness is that 2 meters colliery isolated island coal column is an example, compresses into row control with taking following method impact.

As shown in Figure 1:

One, go up crossheading 1, crossheading 7 down along the coal seam direction developing of coal column, cut eye 4 along the coal seam tendency development works face of coal column, what 3-4 rice was left in above-mentioned tunnel and goaf 5 adopts sky coal column 2, and by the requirement of safety of coal mines supporting is carried out in above-mentioned tunnel.

Two, in upper and lower crossheading apart from the unloading pressure by blasting hole 6 of 42 millimeters of the height drill diameters of 1.0 meters of base plates, 6 meters of the spacings of wells, 6 meters of drilling depths, between unloading pressure by blasting hole 6, bore pilot hole 3 again, pilot hole 3 adopts the large diameter hole of 110 millimeters of diameters, and hole depth is 7 meters, filling explosive cartridge in the unloading pressure by blasting hole 6,2.5 meters of shot depths, the double detonator parallel connection of big gun head, after the stemming obstruction, connect outside the hole once detonation or segmentation are detonated, with the quick-fried pine of coal body, removal pressure.

As shown in Figure 2:

Three, in upper and lower crossheading, be drilled in 42 millimeters of drill diameters on the rib, dark 1 meter chemical grouting hole 8 with electric detonation, 2 meters of jewel hole spacings, plug pvc pipe after the boring and annotate chemical grout to lane group superficial part, chemical grout is selected " the beautiful diffusing N of horse " for use, and lane group is formed greater than 1 meter dark chemical consolidation confining zone 9;

Four,,, inject water glass-cement grout to coal body by this hole as physics injected hole 11 in the position, hole in above-mentioned chemical grouting hole 8 or keep and continue in the intact hole to bore deeply to 6 meters.

After injecting slurries, slurries are enclosed in the coal body, make the slip casting zone form physical modification district 10 by chemical consolidation confining zone 9.

After above-mentioned steps is finished, can carry out actual mining, bump is controlled in the back production.

Fig. 3 is that the rib of another embodiment is reinforced schematic diagram, different is under the harder complete situation of upper and lower crossheading rib with Fig. 2, no longer bore injected hole and carry out chemical grouting, but rib spraying cement mortar is sealed, form spray-up 12, jetting thickness 5-10 centimetre, other step is identical with Fig. 1, Fig. 2.

Claims

1, a kind of control method for coal mine detached island coal pillar rock burst, it at first arranges coal cutting roadway in the low stress area of isolated island coal column, coal cutting roadway comprises other tunnels that crossheading, following crossheading and work plane are cut eye and satisfied production ventilation needs, leaves the wide coal column of 3.0-4.0 rice between coal cutting roadway and the goaf; It is characterized in that may further comprise the steps:

(1) in-place blasting out release

On upper and lower crossheading rib, bore the unloading pressure by blasting hole every 3.0-4.0 rice, the aperture is generally 42 millimeters, hole depth is coal seam thickness or span length 3 times, the aperture be arranged in be convenient to operate apart from base plate 1.0-1.3 rice, the boring direction elevation angle is generally 0-3 °, between per two holes, unloading pressure by blasting hole, bore pilot hole, in the unloading pressure by blasting hole, load explosive and detonator then, shot depth is about 40% of a drilling depth, stop up with stemming, line detonates, the quick-fried pine of coal body, produce the crack between the Kong Yukong, realize inner release;

(2) upper and lower gate road helps the body superficial part to reinforce

Under the harder complete situation of upper and lower crossheading rib, rib spraying cement mortar is sealed, form the mortar spray-up, jetting thickness 5-10 centimetre;

Help at upper and lower gate road under the situation of body soft broken, on rib, bore the chemical grouting hole, pitch-row 2.0-4.0 rice, hole depth 1.5-3.0 rice, Grouting Pipe slip casting in the hole is inserted in the boring back, injecting paste material is an organic polymer, and group's body is carried out chemosetting, makes rib form the chemical consolidation confining zone of 1.0-1.5 rice;

(3) to tunnel group body deep physical modification

After treating that tunnel group body superficial part is reinforced, on the rib of reinforcing, bore the physics injected hole, aperture, pitch-row are identical with the chemical grouting hole, also can in former chemical grouting hole, continue to creep into, brill is 3 times of lanewidth deeply, boring back slip casting in the coal body of in-place blasting out, injecting paste material is water glass-cement mixing slurries commonly used.

2, control method for coal mine detached island coal pillar rock burst as claimed in claim 1 is characterized in that, the pilot hole in step 1 is the large diameter hole greater than 100 millimeters.

3, control method for coal mine detached island coal pillar rock burst as claimed in claim 1 is characterized in that, the pilot hole in step 1 is the small diameter bore identical with the unloading pressure by blasting bore dia of 10 centimetres of 2-3 spacings.