Study on Ground Settlement of Tunnel Shield Construction Based on GRA

摘要

In recent years, the accident statistics of shield tunneling in China's subway tunnels show that the collapse is the most frequent type of accident in subway construction projects. Once it occurs, it often results in group bodied injuries and major economic losses, and the social impact is serious. Due to the disturbance of the surrounding soil caused by the shield construction, uneven settlement on the ground and protective measures were not developed in time and then evolved into high-accident, high-caused collapse accidents. In addition to the engineering geological conditions in the shield construction, the tunneling speed, cutterhead torque, soil warehouses pressure, simultaneous grouting amount, simultaneous grouting pressure, and other parameters in the shield construction are also the main factors affecting ground settlement. This paper analyzes the grey connection degree between the settlement monitoring of a metro shield construction and the shield construction parameters in a certain city. It is concluded that the most important factor causing ground settlement is the pressure of the earth storage, and corresponding preventive measures are proposed for the subsequent tunnel shield construction. It is instructive to reduce surface subsidence and prevent it from becoming a collapse accident.