Method for preventing and controlling rock burst of stope roadway for unequal-width entry protection coal pillar

Abstract

The invention provides a method for preventing and controlling the rock burst of a stope roadway for an unequal-width entry protection coal pillar. The method comprises the following steps that beforethe stope roadway is tunneled, a pressure relief roadway is arranged on a top plate of the unequal-width entry protection coal pillar, then blasting and drilling are carried out in a coal seam on a base plate of the pressure relief roadway so as to manufacture a loose pressure relief area, when working face mining is propelled into a dangerous zone of the stope roadway, along the side facing thepressure relief roadway, pressure relief chambers are tunneled every 12-15 m, drilling and blasting are carried out in the chambers in the direction towards the pressure relief roadway, a fracture body is formed between every two chambers through blasting to dissipate the impact energy of the coal pillar, the effect of buffering and protecting the stope roadway is achieved, and the safety of the roadway during the whole service period is ensured.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] There are more and more deep coal mines in my country, and the appearance of mine pressure and rock burst is becoming more and more serious, especially the problem of rock burst is a dynamic disaster that needs to be solved urgently. The geological conditions of deep mines in my country are complex and changeable, and the deeper the geological factors are, the more decisive they are. . When arranging the stope working face before coal mining, it is necessary to develop the stope roadway, which mainly includes the return air chute and the transportation chute. Due to complex geological conditions in some deep old mines, coal pillars with unequal widths are often left between the upper and lower working faces. Because the stope roadway is arranged in the coal seam, the coal pillars of unequal width protection roadway are large in size and buried deep, the static a...

AI Technical Summary

Problems solved by technology

Because the stope roadway is arranged in the coal seam, the coal pillars of unequal width protection roadway are large in size and buried deep, the static and dynamic stress field of the working face is relatively large, and it has a strong impact tendency, and rock burst is prone to occur during the excavation of the stope roadway, and The impact risk of the stope roadway is further increased when the dynamic stress is added during the mining of the working face

At present, it is difficult to achieve the effect of relieving the danger by taking conventional measures such as water injection into the coal seam, strong support, strong pressure relief of the coal seam, broken top, broken bottom, etc.

So far, no systematic prevention and control technology system has been formed for these specific coal seam conditions

In particular, due to the high lateral stress of coal pillars with different widths, high-level impact energy will be released, which will easily cause local stress concentration in the coal pillar area, and the possibility of destructive rockburst will greatly increase.

Therefore, the problem of rock burst prevention and control in stope roadways of unequal width coal pillars has not been fundamentally resolved so far.

Images