Research on the Zoning Fracture Range of Deep Surrounding Rock under Thermal-Force Coupling Effect

  • Wu Zusong ,
  • Zeng Meiting ,
  • Chen Shifu ,
  • Guo Xiaochuan ,
  • Zhong Hao
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  • 1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400047, P. R. China;
    2. Chongqing Zhonghuan Construction Co., Ltd., Chongqing 401120, P. R. China;
    3. China Metallirgical Construction Engineering Group Co., Ltd., Chongqing 400084, P. R. China

Received date: 2024-03-11

  Online published: 2025-01-03

Abstract

In order to address the problem of the influence of multi-field coupling in high-ground stress areas on the rupture range of deep-seated surrounding rocks, a mechanical analysis model of the plastic zone of surrounding rocks under multi-field coupling is established based on the double-shear unified strength theory, and a formula for calculating the radius of the plastic zone of surrounding rocks in deeply buried tunnels under the action of heat-force coupling is proposed. On this basis, the rupture zone radius calculation formula for the rupture of surrounding rocks in deeply buried tunnels under the action of heat-force coupling is further proposed. Combined with the analysis of engineering examples, it can be seen that, under the action of heat-force coupling, the error of the fracture radius of the surrounding rock zoning calculated based on the double-shear unified strength theory is less than 8.9%, which proves the reasonableness and feasibility of the calculation method proposed in this paper. The research results provide a theoretical basis for the analysis of the stability of the surrounding rock under the influence of high ground stress and high ground temperature and also provide a new method and means to quantitatively describe the phenomenon of zonal rupture.

Cite this article

Wu Zusong , Zeng Meiting , Chen Shifu , Guo Xiaochuan , Zhong Hao . Research on the Zoning Fracture Range of Deep Surrounding Rock under Thermal-Force Coupling Effect[J]. Chinese Journal of Underground Space and Engineering, 2024 , 20(6) : 1830 -1836 . DOI: 10.20174/j.JUSE.2024.06.08

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