Failure mechanisms and control strategies in dynamic pressure roadways of deep soft rock based on compensation theory

被引：0
|
作者：
Guo Z. [1 ,2 ,3 ]
Li W. [1 ,2 ,3 ]
He M. [1 ,2 ,3 ]
Tang J. [4 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing
[2] Institute of Deep Underground Space Science and Engineering, Beijing
[3] School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing
[4] Institute of Mining Engineering, Shandong University of Science and Technology, Shandong, Tai'an
来源：
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2023年 / 52卷 / 05期
关键词：
compensation theory; control strategy; dynamic pressure roadways of deep soft rock; failure mechanism;
D O I：
10.13247/j.cnki.jcumt.20230014
中图分类号：
学科分类号：
摘要：
Large deformation in dynamic pressure roadways of deep soft rock is evident from the influence of surrounding rock stress volution on macro and micro joint fissures. To solve this problem, failure mechanisms and corresponding control strategies were explored using laboratory experiments, field measurements, and numerical simulation. The failure mechanisms in dynamic pressure roadways of deep soft rock were revealed, including low prestress of primary support, excavation effect, and large structure movement. A compensation technology system was developed using the core principles of continuous resistance with highly prestressed negative Poisson's ratio (NPR) anchor cables, multi-dimensional grouting, and ultra-deep hole pressure relief by roof cutting. First, the NPR anchor cables were used to compensate for the surrounding rock stress and control the propagation and penetration of joint fissures. Then, multi-dimension grouting was adopted to improve the strength of rock mass and stabilize the small structure of the surrounding rock. Finally, roof cutting was used to relieve pressure, reduce mining disturbance, and limit large structure movement. The results of this method show that compared with original support roadways, the surrounding rock deformation of compensated support roadways is reduced by approximately 60% at the stage of roadway excavation. However, the surrounding rock deformation is reduced by approximately 70% at the stage of coal mining. The average reinforcement range of multi-dimensional grouting is about 3 m. The results of this engineering application further show that the compensation technology system can adequately control large deformation in dynamic pressure roadways of deep soft rock. © 2023 China University of Mining and Technology. All rights reserved.
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页码：931 / 942
页数：11
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