Stress transfer to protect mining roadway by roof directional hydraulic fracturing

被引：0

作者：

Huang B. ^{[1
]}

Shao L. ^{[1
]}

Zhao X. ^{[1
]}

Li H. ^{[2
]}

Chen S. ^{[2
]}

机构：

[1] State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Jiangsu, Xuzhou

[2] School of Low⁃Carbon Energy and Power Engineering, China University of Mining and Technology, Jiangsu, Xuzhou

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 05期

关键词：

fracture propagation; hard roof; hydraulic fracturing; mining roadway; stress transfer;

D O I：

10.13545/j.cnki.jmse.2023.0364

中图分类号：

学科分类号：

摘要：

The dynamic pressure caused by mining and the high static pressure caused by the hanging roof of the goaf can be transmitted to the mining roadway through main roof, causing the superposition of dynamic and static loads, resulting in the instability and large deformation of the surrounding rock structure of the mining roadway. To reduce the deformation of the mining roadway, a method of stress transfer to protect mining roadway by roof directional hydraulic fracturing was proposed and imple⁃ mented. This method solves the problem of instability and large deformation of the surrounding rock structure of the roadway caused by the dual effects of static and dynamic pressure by cutting off the main roof to block dynamic pressure and cutting off the hanging roof to reduce static pressure. By ap⁃ plying dynamic load stress waves, the influence of dynamic pressure on roadway deformation was si⁃ mulated, and it was found that the increase in deviatoric stress and effective stress was the main cause of roadway deformation caused by dynamic pressure. The optimal hydraulic fracturing location parame⁃ ters were given. An industrial test of directional hydraulic fracturing of the roof was conducted at the 13321 working face of Gubei Coal Mine. The water pressure of the directional hydraulic fracturing of the roof was between 20 MPa and 35 MPa. Within half an hour of hydraulic fracturing, the radius of crack propagation exceeded 10 m, the average radius of crack reached 20 m, and the maximum radius could reach 40 m. The directional hydraulic fracturing of the roof successfully blocked the propagation of mining stress and high stress in the goaf towards the mining roadway. The number of microseismic events before the end of mining was reduced by 77%, the impact range of dynamic pressure was re⁃ duced by about 200 m, a decrease of 64%, the movement of the two sides of roadway was reduced by 86%, and the movement of the roof and floor was reduced by 93% . The method of stress transfer to protect mining roadway by roof directional hydraulic fracturing can effectively reduce the deformation of the mining roadway. © 2023 China University of Mining and Technology. All rights reserved.

引用

页码：991 / 1002

页数：11

共 17 条

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