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Geomechanics and Engineering
  Volume 37, Number 2, April25 2024 , pages 179-187
DOI: https://doi.org/10.12989/gae.2024.37.2.179
 


Dynamic evolution characteristics of water inrush during tunneling through fault fracture zone
Jian-hua Wang, Xing Wan, Cong Mou and Jian-wen Ding

 
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 (a) 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.
 
Key Words
    constant permeability coefficient condition; dynamic evolution characteristics; fault fractured zone; unified time-dependent constitutive model; variable permeability coefficient condition; water inrush
 
Address
Jian-hua Wang, Xing Wan, Cong Mou and Jian-wen Ding: Transportation College, Southeast University, Nanjing 210096, China
 

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