Space-Time Evolution Characteristics of Deformation and Failure of Surrounding Rock in Deep Soft Rock Roadway

Xinfeng Wang (), Yiying Zhang, Qiao Zhang, Youyu Wei, Wengang Liu and Tian Jiang
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Xinfeng Wang: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Yiying Zhang: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Qiao Zhang: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Youyu Wei: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Wengang Liu: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China
Tian Jiang: School of Environment and Resources, Xiangtan University, Xiangtan 411105, China

Sustainability, 2022, vol. 14, issue 19, 1-21

Abstract: In view of the problems of large deformation of surrounding rock, high in-situ stress, and serious soft fracture of rock stratum in deep soft rock roadway, the instability deformation failure mode of deep soft rock roadway is analyzed theoretically. The FLAC 3D software is used to establish a three-dimensional numerical model of surrounding rock damage under load, and to study the displacement, stress, and plastic expansion process of damage and failure evolution in the surrounding rock of the roadway. The mechanical response mechanism of deep soft rock roadway surrounding rock bending deformation, elastoplastic transformation, and unloading failure is verified by MATLAB numerical analysis, and the space-time evolution characteristics of soft rock deformation and failure are revealed. The results show that the surrounding rock of deep soft rock roadway has many failure modes, such as obvious displacement and deformation, high stress concentration, and intensified plastic transformation in the surrounding rock. The vertical stress in the surrounding rock is concentrated at the direct top and bottom, and the horizontal stress is concentrated at the roadway side and bottom; plastic deformation and failure first appeared at the roadway side, and then extended to other parts. The research conclusion provides an important reference for surrounding rock control and roof management of high-stress soft rock roadway under deep excavation disturbance.

Keywords: deep roadway; weak surrounding rock; numerical model; deformation failure; surrounding rock control (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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