Gong-kuang zidonghua (Aug 2021)
Research on the stability control of surrounding rock in the roadway with dynamic pressure and high slope
Abstract
The roadway with dynamic pressure and high slope refers to the roadway which is seriously affected by dynamic pressure and has a high slope. This type of roadway not only experiences disturbances in the excavation process, but also has to experience the disturbance of the adjacent working face and this working face in the later mining process. This makes the deformation and destruction process of the surrounding rock of this kind of roadway different from that of the conventional mining roadway, and the stability of the surrounding rock with high slope is relatively weak. Taking the air intake roadway of a mine's roadway with dynamic pressure and high slope of 15312 working face as the research object, the deformation and damage mechanism of the roadway with dynamic pressure and high slope is studied by using a combination method of numerical simulation and on-site monitoring. And the support parameters of the roadway with dynamic pressure and high slope are optimized accordingly. By analyzing the damage characteristics of the air intake roadway of 15312 working face, it is concluded that the factors affecting the stability of the surrounding rock of the air intake roadway mainly include the strength of the surrounding rock, the size of the roadway section, the stress environment of the surrounding rock and the strength of the surrounding rock support. It is difficult to control the stability of the roadway from the perspective of the low strength of the surrounding rock itself, the large size of the roadway section and the complex stress environment in which the surrounding rock is located. It is proposed to improve the overall stability of the roadway from the perspective of optimizing the roadway support parameters, which is taking measures to increase the support strength and support range of the two sides of the roadway. Numerical simulation results show that the surrounding rock support stress field after the optimization of the support parameters is approximately circular, and the surrounding rock support stress field of the side wall is larger. The result is more suitable for the stability control of the surrounding rock of of the air intake roadway of the 15312 working face. The monitoring results of on-site anchor rods and anchor cables show that after the optimization of the support parameters, the stability control of the surrounding rock of the roadway with dynamic pressure and high slope can be achieved, the deformation of the surrounding rock is smaller, and the control effect is better.
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