CN109915140A - Press control method to a kind of irregular gob-surrounded pillar roadway bump - Google Patents

Abstract

Press control method to irregular gob-surrounded pillar roadway bump of the invention, it is as follows: in the return airway for irregular gob-surrounded pillar of constructing, it is arranged along low stress area cut-off, using fender location as irregular area, irregular area corresponding coal column side location is determined as impact danger zone, using the both wings of impact danger zone as risk transitional region；During return airway driving, conventional large diameter borehole destressing method is taken transitional region first, advanced release is carried out, is further continued for tunneling after each release；When entering danger zone, then conventional large diameter borehole destressing method is taken, so that being converted into weak burst trend with the coal body of burst trend, finally walk out transitional region, until shock hazard completely eliminates, is further continued for tunneling.

Description

Press control method to a kind of irregular gob-surrounded pillar roadway bump

Technical field

The invention belongs to coal mining technology fields.

Background technique

There is irregular gob-surrounded pillar, often after regular stope completes exploitation in order to as far as possible in some old coal mines of China Reclaiming coal resource needs to carry out remnants of defeated troops' exploitation to these gob-surrounded pillars.Need to arrange working face, development work (work before exploitation Make face crossheading) form ventilation, traffic condition.Gob-surrounded pillar especially irregular type gob-surrounded pillar is in development work, usually companion With damaging impact press.The reason is that irregular coal column causes stress field that significant changes occur, when headwork carries out, destroy The distribution of original stress, when pressure reaches certain numerical value, which can occur unstability, induce large area bump.At present The prevention and treatment of the bump of irregular coal pillar mining and the control method in routine work face are essentially identical, and solution danger is mainly taken to arrange It applies, including coal-bed flooding, strong supporting, the strong release in coal seam, disconnected top, disconnected bottom etc..These measures in the specific implementation process, due to companion With the construction of getting working face, it is easier to irregular area cause locality stress concentrate, increase occur bump can Energy property implements coal-bed flooding method and is equally difficult to reach preferable effect, and up to the present there are no fundamentally reach complete The degree of control.Therefore the improvement of the bump during irregular coal column tunnelling is particularly important.

Summary of the invention

The purpose of the present invention is for part present in Controlling of Coal Outburst during irregular coal column tunnelling at present High stress leads to high risk problem, proposes the control method of the new stress transfer of one kind, energy dissipation.

The technical scheme is that a kind of irregular gob-surrounded pillar roadway bump press control method, it is as follows:

One, the arrangement and region division of return airway

In the return airway for the irregular gob-surrounded pillar of constructing, arranged along low stress area cut-off, and between goaf there are The shield lane fender of 3.0 ~ 4.0m width, and constructed according to coal seam conditions and meet production, other tunnels that ventilation needs；Working face After the completion of crossheading construction, it will form some outwardly projecting locations along goaf side and greater than the fender location of 7-8m width, Using these locations as irregular area, by irregular area corresponding gob-surrounded pillar side location according to previous mining Practice and punching Hit and show carry out analogy, determine impact danger zone, using the both wings within the scope of the 30-50m of impact danger zone as Risk transitional region；

Two, Length discrepancy drilling release

During return airway driving, when driving arrives transitional region, conventional major diameter is taken to bore transitional region first Hole destressing method, carries out advanced release, and drilling is arranged in crossheading section center and helps position, the drilling of center close to two It is crept into towards tunneling direction, the drilling for helping position close to two and tunneling direction are crept into 30-45 degree level angle to diagonally forward, drilling Depth is the 1/2 or 1/3 of transitional region length, that is, divides 2 times or 3 releases, be further continued for tunneling after each release, ensures heading driver The safety of work carries out, until driving arrives danger zone；When entering danger zone, then take conventional large diameter borehole release Method carries out advanced release, and drilling depth is 2-3 times of transition region large diameter borehole, can once bore the deep transition region for reaching front Disposable release is realized in domain, and into drilling, water filling softens coal seam again after release, so that it is weak that there is the coal body of burst trend to be converted into Burst trend；Then start driving and ride out danger zone；When into next transitional region, according still further to a upper transition region The pressure relief method in domain carries out release, finally walks out transitional region；

Three, validity check

In danger zone during tunnelling, advanced validity check is carried out using traditional drilling cuttings method；I.e. in exploitation tunnel With the perforating in front of tunneling of 42 drill bit of ф, eye depth 7.0-8.0m, 0 ~ 3 ° of the elevation angle；When drilling cuttings method, which is examined, occurs exceeded, continue pair Danger zone carries out release, until shock hazard completely eliminates, is further continued for tunneling.

The positive effect of the present invention is: the principle by taking preparatory stress transfer, energy dissipation and water filling softening solves Controlling of Coal Outburst problem during irregular pillar face tunnelling, it is ensured that headwork safety.

Illustrate implementation of the invention with reference to the accompanying drawing.

Detailed description of the invention

Fig. 1 is the roadway layout and region division plan view of embodiment；Fig. 2 is the large diameter borehole release signal of embodiment Figure.

Specific embodiment

Those skilled in the art are according to the technical solution of summary of the invention, roadway layout shown in FIG. 1 and region division plane Figure and large diameter borehole release schematic diagram, that is, implementable, this will not be detailed here.

Claims (1)

1. control method is pressed to a kind of irregular gob-surrounded pillar roadway bump, as follows:

(1) arrangement and region division of return airway

In the return airway for the irregular gob-surrounded pillar of constructing, arranged along low stress area cut-off, and between goaf there are The shield lane fender of 3.0 ~ 4.0m width, and constructed according to coal seam conditions and meet production, other tunnels that ventilation needs；Working face After the completion of crossheading construction, it will form some outwardly projecting locations along goaf side and greater than the fender location of 7-8m width, Using these locations as irregular area, by irregular area corresponding gob-surrounded pillar side location according to previous mining Practice and punching Hit and show carry out analogy, determine impact danger zone, using the both wings within the scope of the 30-50m of impact danger zone as Risk transitional region；

(2) Length discrepancy drilling release

During return airway driving, when driving arrives transitional region, conventional major diameter is taken to bore transitional region first Hole destressing method, carries out advanced release, and drilling is arranged in crossheading section center and helps position, the drilling of center close to two It is crept into towards tunneling direction, the drilling for helping position close to two and tunneling direction are crept into 30-45 degree level angle to diagonally forward, drilling Depth is the 1/2 or 1/3 of transitional region length, that is, divides 2 times or 3 releases, be further continued for tunneling after each release, ensures heading driver The safety of work carries out, until driving arrives danger zone；When entering danger zone, then take conventional large diameter borehole release Method carries out advanced release, and drilling depth is 2-3 times of transition region large diameter borehole, can once bore the deep transition region for reaching front Disposable release is realized in domain, and into drilling, water filling softens coal seam again after release, so that it is weak that there is the coal body of burst trend to be converted into Burst trend；Then start driving and ride out danger zone；When into next transitional region, according still further to a upper transition region The pressure relief method in domain carries out release, finally walks out transitional region；

(3) validity check

In danger zone during tunnelling, advanced validity check is carried out using traditional drilling cuttings method；I.e. in exploitation tunnel With the perforating in front of tunneling of 42 drill bit of ф, eye depth 7.0-8.0m, 0 ~ 3 ° of the elevation angle；When drilling cuttings method, which is examined, occurs exceeded, continue pair Danger zone carries out release, until shock hazard completely eliminates, is further continued for tunneling.