Based on Effect Coefficient Method of Metro Tunnel Collapse Risk Evaluation Model and its Application

Tunnel collapse is one of the most common accidents in the tunnel construction of city subway, and risk assessment is a method to measure the magnitude of the collapse risk. In order to effectively identify in advance the risk category of tunnel collapse, an identification method is put forward based on entropy weight method and efficiency coefficient method. On the basis of a comprehensive analysis of factors that affect the collapse, 6 main factors including rock level, tunnel depth, tunnel span, the surrounding conditions, groundwater and construction factors are selected as the evaluation indexes. Through a quantitative description of the evaluation indexes by using the TSP203 geological prediction system, and based on the basic principles of ideal point method, a comprehensive and intelligent evaluation model which can identify the tunnel collapse risk in subway construction is established. Finally, the model is applied to practical engineering, and it shows that the result of risk assessment is consistent with the actual construction conditions, which provides a new perspective on the advancing identification of tunnel collapse risk in subway construction.