Cause analysis of water and mud inrush in fault fracture zone of deep tunnel and its treatment measures

Abstract

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.