A whole-range adjustable resistance and yielding method for large deformation tunnels

Abstract

The invention relates to a full-range adjustable resistance and pressure yielding method of a large-deformation roadway, which includes: constructing a pressure-relief drilling hole in the side of the roadway, arranging a shrinkable bladder in the drill hole, and injecting a bearing into the shrinkable bladder Pressurized fluid until the expandable bladder is filled with pressurized fluid; when the pressure relief drill hole is deformed, open the valve port of the pressure regulating device to discharge part of the pressurized fluid, so that the pressure in the expandable bladder can be reduced to a certain level. The pressure at which the deflated bladder begins to work. In the method of the present invention, the reaming section is used as a large pressure relief space, which provides a large compensation space for the creep deformation of the surrounding rock inside the roadway, and reduces the deformation of the side of the roadway; the pressure relief space is arranged outside the anchorage range of the roadway, Does not affect the support system of the roadway; the pressure relief space changes the stress state of the surrounding rock in the deep high-stress soft rock or the roadway affected by strong dynamic pressure, which is beneficial to the force of the roadway; it can control the pressure in the roadside pressure relief drill hole throughout the process Pressure, realize controlled pressure relief, ensure the stability of the roadway, and reduce the cost of roadway expansion and support.

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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