Study On Construction Risk Analysis And Deformation Law Of Surrounding Rock Of Optimization Of Tunnel Goes Through Fault Fracture Zone

In recent years, with the rapid development of China’s traffic, the tunnel construction in the western region of complex topography and geological conditions will meet more unfavorable geological condition, the Collapse and Sudden Water Inflow occur easily in the tunnel construction. In a variety of adverse geological conditions, the fault fracture zone is an important source of geological disasters. The nature, scale and excavation and support of fault fracture zone is the decisive factor affecting the safety of the project,so, studying the tunnel through the fault fracture with landslide risk, the mechanical effects in the construction process and the deformation law. and optimizing a fast, secure, construction Method of the economy has important engineering significance.This paper adopts Fuzzy mathematics by Combination of The Numerical Analysis and Field test, study the landslide risk of the tunnel through the fault fracture zone first.in the foundation of analysis on the main controlling factors of the collapse, established risk identification model and and giving a example analysis. In this model test, there are studies on tunnel excavation process mechanical effects of bench method with support, whole section method with support, and whole section without support.Through the comprehensive analysis of numerical simulation,construction plan, two benches adding invert method, is proposed for Duanjiawu Tunnel test section. The feasibility of this plan is validated by comparing the on-site monitoring information with Numerical Analysis.The results show that the construction optimized is feasible. With this excavation method, construction efficiency of Duanjiawu Tunnel is raised, and the geological disasters are avoided through the tunnel crossing the fault fracture zone,and the tunnel’s long-term stability can be guaranteed.