Abstract Water inflow disasters usually occur in the construction of super-long tunnels in water-rich areas. Therefore, accurate prediction of water inflow in the tunnel can give a scientific guidance for design and construction of the tunnels. New Guanshan tunnel is located in the Guanshan fold belt, where groundwater circulation is powerful as well as rock joints and fissures are developed, having a greater impact on the safety of tunnel construction.In this paper, hydrogeological conditions of Guanshan tunnel are analyzed and different water inflow calculation methods are adopted to predict the water inflow in each studied section of the tunnel. It is found from the comparative analysis that the prediction result by the underground runoff modulus method is more practical. Meanwhile,FLAC3D software is used to simulate the water inflow in each section of Guanshan tunnel, and the groundwater level is inversely analyzed to obtain a groundwater level consistent with the actual situation. Then, according to the parameters obtained from the inversion, a three-dimensional numerical simulation is performed to predict the water inflow during the construction of Guanshan Tunnel, and the obtained water inflow could be used as a reference for the actual situation
Abstract：
Water inflow disasters usually occur in the construction of super-long tunnels in water-rich areas. Therefore, accurate prediction of water inflow in the tunnel can give a scientific guidance for design and construction of the tunnels. New Guanshan tunnel is located in the Guanshan fold belt, where groundwater circulation is powerful as well as rock joints and fissures are developed, having a greater impact on the safety of tunnel construction.In this paper, hydrogeological conditions of Guanshan tunnel are analyzed and different water inflow calculation methods are adopted to predict the water inflow in each studied section of the tunnel. It is found from the comparative analysis that the prediction result by the underground runoff modulus method is more practical. Meanwhile,FLAC3D software is used to simulate the water inflow in each section of Guanshan tunnel, and the groundwater level is inversely analyzed to obtain a groundwater level consistent with the actual situation. Then, according to the parameters obtained from the inversion, a three-dimensional numerical simulation is performed to predict the water inflow during the construction of Guanshan Tunnel, and the obtained water inflow could be used as a reference for the actual situation
Zhou Wenjun
.Study on Water Inflow Prediction Technology for Guanshan Tunnel on Tianshui-Pingliang Railway[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(2): 22-30
2021, Vol. 58 