CN101713290B

CN101713290B - Method for clearing rock burst of full-mine laneway deep in mine

Info

Publication number: CN101713290B
Application number: CN2009102422469A
Authority: CN
Inventors: 潘俊锋; 任勇; 毛德兵; 齐庆新
Original assignee: Tiandi Science and Technology Co Ltd; China Coal Research Institute CCRI
Current assignee: Tiandi Science and Technology Co Ltd; China Coal Research Institute CCRI
Priority date: 2009-12-10
Filing date: 2009-12-10
Publication date: 2012-04-18
Anticipated expiration: 2029-12-10
Also published as: CN101713290A

Abstract

The invention relates to a method for clearing the rock burst of a full-mine laneway deep in mine. The method comprises the following steps of: firstly, digging an upper crossheading, a through cut and a lower crossheading along a low-stress region in an underground mining area, wherein the upper crossheading, the through cut and the lower crossheading satisfy the production and ventilation requirements; and leaving 3-4m at one side of the upper crossheading close to a goaf for protecting entry pillars. The method also comprises the following steps of: (1) laying metal nets on the top plate and both sides of the lower crossheading 100-150m behind the digging position of the lower crossheading; (2) embedding anchor rods with W-shaped anchor straps in both sides of the net-laid laneway; and (3) symmetrically drilling single row of pressure-releasing explosion holes in the depth 3.5-4 times that of the laneway in both sides of the laneway supported by the anchor nets (straps). The invention has the advantages that (1) the partial energy of surrounding rock at the deeper part of the laneway coal wall is released, and high-centralized stress is transferred to the deep part; (2) the supporting effect of the anchor nets at the shallow part is not influenced by the explosion of the deeper part of the laneway coal wall; (3) the surrounding rock at the shallow part of the laneway coal wall is reinforced, the shock-resistance capability is enhanced, and the deformation of the laneway coal wall is restricted; and (4) the invention has the overall effect of avoiding the rock burst.

Description

The clearing rock burst of full-mine laneway deep in mine method

Technical field

The present invention relates to the coal mining technical field, particularly a kind of clearing rock burst of full-mine laneway deep in mine method.

Background technology

In recent years, along with continuing to increase of the coal mining degree of depth, bump generation intensity, frequency be all in continuous increase, and thick and super high seam bump mainly occurs in the full coal road road that closes on stope for the deep.And bump control also mainly continue to use over resist stubbornly, hard coal, hard-condition of the hard ends three or thin and medium-thickness seam prophylactico-therapeutic measures; Be coal-bed flooding, unloading pressure by blasting, boring release, disconnected top release etc.; The single generation of taking these measures to be difficult to fundamentally stop fully bump often makes full coal road road rib broken, and the roadway deformation amount increases; Anchor rod anchored effect inefficacies etc., the stope drift active workings shock hazard is still bigger.

Goal of the invention

The objective of the invention is to have great deficiency to local solution danger measure in the control of full coal road road, present deep bump, utilize the ore deposit pressure to manifest rule and propose a kind of new clearing rock burst of full-mine laneway deep in mine method, this method has following function:

1, tunnel two is helped to obtain discharging than portion of energy in the deep wall rock, and high concentrated stress helps the deep to shift to tunnel two;

2, tunnel two helps superficial part surrounding rock structure globality, soundness to strengthen, and has retrained the roadway deformation amount;

3, above-mentioned 1,2 function mass actions can prevent that bump from taking place.

For reaching the purpose of foregoing invention, the present invention adopts following technical scheme:

It at first in the exploiting field, down-hole, satisfy along low stress area digging produce, the ventilation needs on crossheading, open-off cut, crossheading down, close on upper curtate goaf one side at last crossheading to stay 3～4m protection pillar, also comprise the steps:

(1) lagging behind the 100m～150m place of crossheading driving down, crossheading top board and two is helped to lay wire lath;

(2) anchor pole and the back of the body " W " type anchor band are helped to implant in the tunnel two of having spread behind the wire lath;

(3) to help symmetry to creep into single, the degree of depth be the release shot hole of 3.5～4 times of head-rooms to the tunnel two after anchor net (band) supporting.

The spacing of the same row of anchor pole is 600mm～700mm, and same row's spacing is 800～900mm.

Release shot hole height is apart from roadway floor 1～1.5m; The boring angle of elevation alpha is 0～3 °; Spacing is 3～5m; The aperture is

60mm; Join

55mm explosive; Loaded length is about 60%～70% of hole depth at the bottom of the hole, and all the other length seal with cement-roll.Can adopt two detonating fuses to ignite and reach tunnel rib release.

The mesh of described wire lath is a rhombus.

Good effect of the present invention is:

1,, make rib place, nearly tunnel coal body not possess powerful supporting capacity when discharging a part of impact energy on the one hand, thereby the high concentrated stress of roadway surrounding rock help the deep to shift to two through tunnel two being helped deep hole release explosion; Enlarged tunnel relaxation zone radius on the other hand, deep wall rock and bolt support band produce the impact energy buffer strip in the tunnel.

2, through help the explosion sealing of hole of rock-bolt length greater than tunnel two, when making the coal mass relief explosion, only the deep coal body is produced fragmentation, and do not influence the anchoring effect of outer side anchor net.

3, through two helping to increase anchor net (band), not only strengthened the integrality of tunnel superficial part country rock, and further the impact energy from the tunnel deep wall rock has been produced and consume, retrained surface, tunnel drastic deformation, thereby avoided the bump generation in the tunnel.

Description of drawings

Fig. 1 is the sketch map that the present invention implements

Fig. 2 is the A-A section of Fig. 1

Fig. 3 is a W type anchor band vertical view

Fig. 4 is W type anchor net (band) combining structure sketch map

Among Fig. 1, Fig. 2: the adjacent goaf of 1-, the 2-protection pillar, the last crossheading of 3-, this work plane of 4-is cut eye, this work plane of 5-entity coal, crossheading under the 6-, the 7-diamond mesh, 8-helps anchor pole, 9-release shot hole, 10-release shot hole powder charge section, 11-lower curtate entity coal.

Among Fig. 3, Fig. 4,12 is the anchor band, and 13 is pallet, and 14 is nut.

The specific embodiment

1, as shown in Figure 1, at certain bump mining areas of mine, at first in coal body 5, reserve 3～4m protection pillar 2; Crossheading 3 on the digging; This work plane is cut tunnels such as eye 4 and following crossheading 6, and carries out supporting by the coal mining requirement, forms formal production, ventilation system.

2, hysteresis beyond crossheading 6 driving 100m～150m, helps to lay diamond mesh 7 to top board and two down; It is the anchor pole 8 of 2.5m that implantation depth is helped in tunnel after the lapping two, and the back of the body " W " type anchor band 12, and the spacing of the same row of anchor pole is 600mm～700mm, and same row's spacing is 800～900mm.

Group's anchor pole is to fix through pallet 13 and nut 14 with the connected mode of " W " type anchor band, and diamond mesh is compressed.

3,6 tunnels two of the following crossheading behind bolting with wire mesh help symmetry to creep into the release shot hole 9 that the single degree of depth is 3.5～4 times of head-rooms; Highly be apart from roadway floor 1～1.5m; The boring elevation angle is 0～3 °; Spacing is 3～5m, and the aperture is

60mm, joins

55mm explosive; At the bottom of the hole; Release shot hole powder charge section 10 length are about 60%～70% of hole depth, and all the other length seal with cement-roll, ignite with two detonating fuses and reach tunnel rib release; High concentrated stress shifts to the deep, avoids or weaken bump taking place.

Claims

1. clearing rock burst of full-mine laneway deep in mine method; It at first in the exploiting field, down-hole along low stress area digging produce, crossheading, open-off cut, time crossheading on ventilations needs; Close on upper curtate goaf one side at last crossheading and stay 3～4m protection pillar, it is characterized in that: also comprise the steps:

(3) to help symmetry to creep into single, the degree of depth be the release shot hole of 3.5～4 times of head-rooms to the tunnel two after the supporting of anchor band.

2. a kind of clearing rock burst of full-mine laneway deep in mine method according to claim 1 is characterized in that: the spacing of the same row of anchor pole is 600mm～700mm, and same row's spacing is 800～900mm.

3. a kind of clearing rock burst of full-mine laneway deep in mine method according to claim 1 and 2; It is characterized in that: release shot hole height is apart from roadway floor 1～1.5m; The boring angle of elevation alpha is 0～3 °; Spacing is 3～5m;

explosive is joined for

in the aperture; Loaded length is about 60%～70% of hole depth at the bottom of the hole, and all the other length seal with cement-roll.

4. the described a kind of clearing rock burst of full-mine laneway deep in mine method of claim 3 is characterized in that: adopt two detonating fuses to ignite and reach tunnel rib release.

5. claim 1 or 2 described a kind of clearing rock burst of full-mine laneway deep in mine methods, it is characterized in that: the mesh of described wire lath is a rhombus.