Research on Foundation Pit Construction Risk of Metro Station Based on Fuzzy Entropy Theory

There are many risks in the construction of Foundation Pit of Subway Station because of the complicated conditions and numerous factors influencing foundation pit construction. In order to reduce the construction risk, this paper firstly established the risk evaluation index system of subway station foundation pit construction, which includes seepage breaking, support instability, pit soil landslide, skirting damage, sudden surge damage and mechanical wounding (six first - level indicators, seventeen secondary indicators);Then, the fuzzy entropy theory is applied to calculate the weight of each index, and the construction risk evaluation model of subway station foundation pit is established. Finally, taking LingBin road subway station foundation pit construction in Tianjin as an example, the construction risk of the pit foundation project was evaluated, the evaluation results provide a good basis for the construction risk prevention of the foundation pit.