TY - JOUR
TI - The non-Darcy characteristics of fault water inrush in karst tunnel based on flow state conversion theory
AU - Cao Zheng-Zheng
AU - Xue Yu-Feng
AU - Wang Hao
AU - Chen Jia-Rui
AU - Ren Yu-Lou
JN - Thermal Science
PY - 2021
VL - 25
IS - 6
SP - 4415
EP - 4421
PT - Article
AB - The fault water inrush is a key factor which leads to tunnel construction in  karst regions. Based on the fluid mechanics principles, the paper addresses  a numer­ical coupled model for karst fault tunnel with COMSOL Multiphysics  software. Besides, the Darcy law equation, Brinkman equation, and  Navier-Stokes equation are inserted to stimulate the steady flow of aquifer,  the non-linear seepage of fault and the free flow in tunnel excavating area  in software, respectively. Then, the pres­sure and flow velocity in three  flow fields are analyzed under different permeability ratios in numerical  model. It is shown that the fault permeability is the key factor affecting  water inrush, and that the pressure and flow velocity change visibly in  adjacent domains between two flow fields.