Geomechanics and Engineering

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Dynamic evolution characteristics of water inrush during tunneling through fault fracture zone

  • Jian-hua Wang (Transportation College, Southeast University) ;
  • Xing Wan (Transportation College, Southeast University) ;
  • Cong Mou (Transportation College, Southeast University) ;
  • Jian-wen Ding (Transportation College, Southeast University)
  • Received : 2022.05.29
  • Accepted : 2024.04.04
  • Published : 2024.04.25
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Abstract

In this paper, a unified time-dependent constitutive model of Darcy flow and non-Darcy flow is proposed. The influencing factors of flow velocity are discussed, which demonstrates that permeability coefficient is the most significant factor. Based on this, the dynamic evolution characteristics of water inrush during tunneling through fault fracture zone is analyzed under the constant permeability coefficient condition (CPCC). It indicates that the curves of flow velocity and hydrostatic pressure can be divided into typical three stages: approximate high-velocity zone inside the fault fracture zone, velocity-rising zone near the tunnel excavation face and attenuation-low velocity zone in the tunnel. Furthermore, given the variation of permeability coefficient of the fault fracture zone with depth and time, the dynamic evolution of water flow in the fault fracture zone under the variable permeability coefficient condition (VPCC) is also studied. The results show that the time-related factor (α) affects the dynamic evolution distribution of flow velocity with time, the depth-related factor (A) is the key factor to the dynamic evolution of hydrostatic pressure.

Keywords

Acknowledgement

This work was supported by the International Postdoctoral Exchange Fellowship Program from China Postdoctoral Council (PC2021016). The authors would like to express appreciation to the reviewers for their valuable comments and suggestions that helped to improve the quality of the paper.

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