CN103410514A

CN103410514A - Pressure relief and coal extraction method for deeply-compressed ore body

Info

Publication number: CN103410514A
Application number: CN2013103272319A
Authority: CN
Inventors: 宫国慧; 田迎春; 刘殿军; 任凤玉; 陈晓云; 金忠伟; 郭海涛; 孟令广; 陈继宏; 齐双飞
Original assignee: Angang Group Mining Co Ltd
Current assignee: Angang Group Mining Co Ltd
Priority date: 2013-07-31
Filing date: 2013-07-31
Publication date: 2013-11-27

Abstract

The invention discloses a pressure relief and coal extraction method for a deeply-compressed ore body. The method comprises excavation operation of excavation lagging stopping operation of a stopping laneway of a lower segment, pressure relief rock drilling operation in arrangement of a fan-shaped middle deep hole, and stopping ore removal operation performed under a covering stratum by an upper segment before excavation; a stopping working face of the upper segment exceeds the excavation working face of the stopping laneway of the lower segment for 20 to 30 cm, so that the progress of the excavation working face of the lower segment is the same as that of the stopping working face of the upper segment, and excavation is not performed to stopping laneways of other segments; a pressure relief straight line forming an angle of 90 to 95 degrees with the horizontal plane is formed at the upper corner of a top plate of the stopping laneway in an upwards manner; when stopping operation is performed to the upper segment, the stopping laneway of the lower segment is arranged within the range of the pressure relief straight line and ore body footwall; the side hole of the middle deep hole is as deep as the position of the pressure relief straight line; the stopping laneway is clung to the ore body footwall. The method has the advantages of preventing solid working from high stress rupture, ensuring construction safety, ensuring effective utilization of a project and ensuring recovery of resources.

Description

Deep pressurized ore body release stoping method

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Technical field

The present invention relates to a kind of mining technology, particularly, in a kind of deep mining engineering, be subjected under the High Pressure condition of top at ore body, deep pressurized ore body is slowed down to the deep pressurized ore body release stoping method of high pressure effect.

Background technology

The metal mine underground mining is generally applied a kind of sublevel caving method without sill pillar, the stoping operation of this mining methods all carries out in stope drift active workings, process for stoping is simple, be applicable to large-scale trackless equipment, mechanization degree is high, is a kind of a kind of mining methods that are applicable to high-dipping middle thickness orebody and inclined thick orebody.But along with the further downward deepening of mining engineering, the ore body pressurized is obvious especially.Especially for deep orebody (ore body that 600-800 rice is following), the ground pressure manifests obvious especially, and especially to exploitation ore body later, upper dish rock is unminded the ore body additonal pressure to bottom and obviously increased.

As shown in Figure 1, due to after ore body 1 top exploited, the top covering layer gets off to form the empty slag 7 in top from ground settlement, therefore ore body upper lower burrs stress changes, on ore body, the dish rock mass is separated with the lower wall rock mass, the upper dish rock mass of adopting part does not directly act on the lower wall rock mass, but act on empty slag, and empty slag is dynamic, move downward always, therefore make the dish rock mass form a wedge shape pressure body 11, its pressure direct effect is below on unquarried ore body 1, on each stope drift active workings 6 in therefore unquarried ore body 1, bearing huge pressure.And does not safeguard in current stope drift active workings 6 general Dou Shiluo lanes.In this case, still according at present normal stoping method, construct, have following defect:

The one, after stope drift active workings 6 drivings, need immediate support, and need long-time the maintenance, to resist lasting pressure-acting.Otherwise stope drift active workings 6 driving is complete, just by pressure, collapsed soon, form scrapped project, often appear in the stope drift active workings 6 of advance development, medium-length hole 4 mining rock drilling constructions also do not have complete, and the phenomenon that stope drift active workings 6 are just collapsed and scrap by pressure causes the ore body 1 can't back production;

The 2nd, deep tunnel is due to long-term pressurized effect, and operation danger close in tunnel, side roof accident and " rock burst " accidents such as wall caving roof fall easily occur;

Solution is at present, after stope drift active workings 6 are damaged by pressure calcellation, must do stope drift active workings 6 again, re-starts medium-length hole 4 mining constructions, adopts by force strong pick, accelerates to advance.Do so usually because the stope drift active workings position is unreasonable, the back production effect is bad, exhausts the people and drains the treasury.

Summary of the invention

In order to overcome above-mentioned defect, the purpose of this invention is to provide a kind of technical problem to be solved and be to provide a kind of stoping method of ore body under the high pressure effect that solves in deepening exploitation, make stope drift active workings slow down high pressure, guarantee that stope drift active workings can effectively utilize, assurance mining engineering safety is carried out smoothly, improves the economic and social benefits.

Technical scheme of the present invention is:

A kind of deep pressurized ore body release stoping method, comprise excavation operation, the release rock drilling operation while arranging fan shaped medium length hole of the driving hysteresis stoping operation in lower substoping tunnel, and upper segmentation is ahead of the back production ore removal operation of driving under covering layer.It is characterized in that: the excavation operation face 20-30m in the in advance lower substoping of upper substoping scope of operation needs tunnel, make the progress of the lower sublevel drive scope of operation consistent with the progress of the upper substoping scope of operation, the tunneling construction of stope drift active workings is not carried out in other each segmentation; When the long and medium hole drilling operation is carried out in lower segmentation, with side angle place on the stope drift active workings top board, upwards do a release straight line horizontal by the 90-95 degree, when this straight line passes ore body, driving medium-length hole take this release straight line and is the rock drilling scope, during back production, the explosion mine belt that falls has a part of rock of upper dish, to guarantee that stope drift active workings are not subjected to upper dish pressure-acting; Stope drift active workings are arranged near the ore body lower wall.

Utilize this mining methods, by reasonable arrangement, adopt the sequence of construction of accurate engineering, back production engineering, avoid thus adopting accurate engineering and suffer heavily stressed destruction, guarantee construction safety, the assurance engineering is effectively utilized, and guarantees that resource reclaims.

The accompanying drawing explanation

Fig. 1 is deep pressurized ore body schematic diagram;

Fig. 2 is the vertical section schematic diagram of stoping method of the present invention;

Fig. 3 is the A-A ' drawing in side sectional elevation of Fig. 2;

Fig. 4 is the B-B ' horizontal sectional drawing of Fig. 2;

Fig. 5 is the C-C ' longitudinal plan of Fig. 3;

Wherein: 1, ore body; 2, cutting tunnel; 3, cutting well; 4, medium-length hole; 5, connection roadway; 6, stope drift active workings; 7, empty slag; 8, release straight line; 9, stope box; 10, segmentation connection roadway; 11, upper wedge pressure body.

The specific embodiment

The invention will be further described below in conjunction with accompanying drawing:

Process for stoping of the present invention as shown in Figure 2,4, the back production of ore body 1 top finishes, this segmentation cutting tunnel 2 and cutting well 3, in right half, dark scallop hole has been constructed completely, in stope drift active workings 6, medium-length hole 4 is carried out forming empty slag 7 after explosion, with trackless equipment, load and transport, by connection roadway 5, plough under in stope box 9, at next horizontal transport, go out.This process is identical with general sublevel caving method without sill pillar.

In order to guarantee that stope drift active workings are not destroyed by the high pressure of upper wedge pressure body 11, take simultaneously following three kinds of methods:

The one, along with the continuous back production of a upper segmentation (fan shaped medium length hole explosion fall ore deposit, electric LHD ore removal), construct following closely in lower substoping tunnel 6, as C-C' section in Fig. 5, at this moment go up the substoping scope of operation and descend in advance the excavation operation face 20-30m in substoping tunnel 6, make the progress of the lower sublevel drive scope of operation consistent with the progress of the upper substoping scope of operation, the tunneling construction of stope drift active workings 6 is not carried out in other each segmentation; Due to back production of top, the empty slag 7 of a prose style free from parallelism is formed at top like this, removed the pressure of 11 pairs of bottom ore bodies of wedge pressure power body, and the pressure of the empty slag 7 of a prose style free from parallelism is far smaller than the pressure of wedge shape pressure body, thereby reduces the destruction of pressure to stope drift active workings;

The 2nd, during the fan shaped medium length hole design and construction, consider lower substoping tunnel compressive region, determine release straight line 8, release straight line 8 is determined by the following method: as Fig. 3, with side angle place on the stope drift active workings top board, upwards do the straight line of horizontal by 90 to 95 degree scopes.Stope drift active workings 6 are arranged in the scope of release straight line 8 and ore body lower wall, will be not affected or less affected by the pressure-acting of upper wedge pressure body 11 to it.When medium length blasting design was constructed, lateral opening depth design was to the position of release straight line 8 simultaneously.Each segmentation, according to the difference at the inclination angle of ore body, is all according to said method determined the lateral opening degree of depth.Thus, after medium-length hole blasting, the pressure of the above slag body of this part to lower substoping tunnel, be no longer the pressure of wedge shape pressure body 11, thereby pressure decreased guarantees that stope drift active workings are not subjected to the compression failure of wedge shape pressure body;

The 3rd, stope drift active workings 6 are arranged near the ore body lower wall, so not only are conducive to avoid the compression failure of wedge shape pressure body, and can reclaim to greatest extent ore.

Claims

1. deep pressurized ore body release stoping method, comprise excavation operation, the release rock drilling operation while arranging fan shaped medium length hole of the driving hysteresis stoping operation in lower substoping tunnel, upper segmentation is ahead of the back production ore removal operation of driving under covering layer, it is characterized in that: the excavation operation face 20-30m in the in advance lower substoping tunnel (6) of upper substoping scope of operation needs, make the progress of the lower sublevel drive scope of operation consistent with the progress of the upper substoping scope of operation, the tunneling construction of stope drift active workings (6) is not carried out in other each segmentation; With side angle place on stope drift active workings (6) top board, upwards do the release straight line (8) horizontal by the 90-95 degree, when stoping operation was carried out in upper segmentation, lower substoping tunnel (6) was arranged in the scope of unloading line ball and ore body lower wall; The lateral opening degree of depth of medium-length hole is to the position of release straight line; Stope drift active workings (6) are arranged near the ore body lower wall.