Whole-process resistance-adjustable pressure yielding method for large deformed roadway

Abstract

The invention relates to a whole-process resistance-adjustable pressure yielding method for a large deformed roadway. The whole-process resistance-adjustable pressure yielding method comprises the steps that a pressure relief drill hole is formed in a roadway side of a roadway, a shrinkable and inflatable bag is arranged in the drill hole, and pressure bearing fluid is injected into the shrinkableand inflatable bag until the shrinkable and inflatable bag is filled with the pressure bearing fluid; and when the pressure relief drill hole is deformed, a valve port of a pressure adjusting deviceis opened to discharge a part of the pressure bearing fluid, so that the pressure in the shrinkable and inflatable bag is decreased to the pressure when the shrinkable and inflatable bag starts to work. According to the whole-process resistance-adjustable pressure yielding method, a hole expanding section is used as a large-scale pressure relief space, a large compensation space is provided for the creep deformation of the surrounding rock in the roadway, and the deformation of the roadway side is reduced; a pressure relief space is formed outside the roadway anchorage range, and a roadway support system is not affected; the surrounding rock stress state of deep high-stress soft rock or the roadway affected by high dynamic pressure is changed by the pressure relief space, and the stress ofthe roadway is facilitated; and the pressure in the pressure relief drill hole of the roadway side can be controlled in the whole process, the controlled pressure relief is achieved, the stability ofthe roadway is ensured, and the costs of roadway brushing and support are lowered.

Description

technical field [0001] The invention belongs to the field of coal mining, and in particular relates to a full-range adjustable resistance and yielding method of a large deformation roadway. Background technique [0002] With the increasing demand for domestic coal and the increase in mining intensity, mining areas in the central and eastern regions of my country have gradually entered into deep mining, and the problem of roadway support under the influence of deep high-stress soft rock and strong dynamic pressure has become increasingly prominent. Compared with shallow roadways, the surrounding rock mechanical environment of deep high-stress soft rock roadways is more complex, showing a series of engineering response problems such as discontinuity, uncoordinated large deformation, and large-scale instability and damage. The authors have conducted in-depth research on this, but the problem of surrounding rock control in deep roadways has not been well resolved, and it is stil...

AI Technical Summary

Problems solved by technology

[0005] (1) Most of the pressure relief grooves are the size of drill holes, and the pressure relief space is small. In the roadway with continuous large deformation, the pressure relief effect is very small;

[0006] (2) In the deep high-stress soft rock or the two sides of the roadway affected by strong dynamic pressure, the continuous large deformation will gradually compress and close the pressure relief groove, causing the pressure relief groove to lose its pressure relief function;

[0007] (3) When the compression and closure of the pressure relief groove loses its effect, re-arranging the pressure relief groove will disturb the unstable surrounding rock of the roadway, making the surrounding rock of the roadway more broken, and the difficulty of roadway support will be greatly increased;

[0008] (4) This kind of pressure relief cannot implement controlled pressure relief for the roadway, but only allows the deformation of the pressure relief groove, and there is no active force for the pressure relief space to control the deformation of the pressure relief space, and the pressure relief effect is not good.

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