Mechanism of Time-Dependent Instability of Deep Soft-Rock Roadway and Crack-Filling Reinforcement Technology

被引:2
作者
Wu, Bowen [1 ]
Chang, Jucai [1 ]
Li, Chuanming [1 ]
Wang, Tuo [1 ]
Shi, Wenbao [1 ]
Wang, Xiangyu [2 ]
机构
[1] Anhui Univ Sci & Technol, Sch Min Engn, Huainan 232001, Peoples R China
[2] China Univ Min & Technol, Sch Mines, Xuzhou 221116, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2023年 / 13卷 / 07期
基金
中国国家自然科学基金;
关键词
deep roadway; soft rock; time-dependent damage; crack filling; stability analysis; FAILURE-MECHANISM; COAL-MINE; STRESS; CREEP;
D O I
10.3390/app13074641
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Soft broken surrounding rock exhibits obvious rheological properties and time-dependent weakening effects under the action of deep high-ground stress, leading to the increasingly prominent problem of sustained large deformation in deep roadways. In this study, with the II5 Rail Rise in Zhuxianzhuang Coal Mine as an example, the mechanism and control technology of time-dependent damage and instability in a deep soft-rock roadway were explored through a field observation and numerical simulation. The research results show that the range of the loose circle in the deep fractured surrounding rock can reach 3.0 m. The expansion of shallow and deep cracks causes the primary plastic deformation and secondary rheological deformation of the surrounding rock, with the rheological deformation rate increasing by 21.4% every 55 days on average, which ultimately induces the instability and failure of the surrounding rock. Based on the mechanism of roadway instability, a control technology of high-preload bolt + deep- and shallow-borehole crack filling was proposed. The technology reduces deformation and ensures the stability of the roadway surrounding rock by inhibiting the propagation of deep and shallow cracks and reinforcing the surrounding rock.
引用
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页数:22
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