Taking the potential risk of water and mud inrush in the construction of a water conveyance tunnel of a hydropower station as the engineering background, based on the field investigation and data collection, the whole process of tunnel construction is simulated and analyzed by using 3D finite element Midas. The results show that because the tunnel passes through the strong water rich fault fracture zone, the filling material in the fault fracture zone has obvious stress concentration under the coupling action of high stress, high pressure seepage and construction disturbance, and the displacement of the filling material has increased significantly. After the fault fracture zone is exposed, the seepage speed has increased significantly, indicating that water and mud inrush disaster has occurred here. It is suggested that when the tunnel passes through complex water-rich fault, monitoring and early warning and excavation support measures should be strengthened to prevent water and mud inrush accidents. The research results have a certain guiding role for the safe construction of the tunnel project.
A water conveyance tunnel of a hydropower station encountered the disaster of water inrush and mud inrush in the fault fracture zone, which caused the filling collapse in the fault fracture zone on the face of the tunnel, which seriously threatened the safety construction of the workers and affected the construction period. Based on the comprehensive analysis of the influencing factors of water and mud inrush in the fault fracture zone of the tunnel, this paper makes a preliminary analysis of the water and mud inrush in the tunnel, and puts forward the comprehensive treatment measures for the construction of the collapse section. Through the field engineering practice, this disposal measures passed the collapse section smoothly. The research results can be used for reference to the cause analysis of water and mud inrush in the fault fracture zone of similar tunnels and the construction method in the collapse section.
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