Applicability Research Of Topology Optimization In Soft Surrounding Rock Tunnel Structure

With the development of highway construction, tunnel engineering is increasing. Because of the design of tunnel support structure still adopts the traditional design method, it lead to bigger safety coefficient, which cannot fully consider both the economy and the requirements of security for achieving the goal of economic and reasonable. Therefore, it is necessary to optimize the traditional tunnel supporting structure. In view of these, according to the pool tunnel supporting structure of the inverted arch destructive section, on the basis of the theory of topology optimization, optimize the design for tunnel support structure. The main research contents and conclusions are as follows:(1) To summarize the current research of soft rock tunnel, analysis of the reasons and mechanics model for damage of the inverted arch, this paper discusses the inverted arch tunnel section type optimization about the safety of the whole structure in weak rock.(2) Based on the basic theory of topology optimization for damaged section of pool inverted arch tunnel, combined the project summary and the analysis of the measured result, to analysis the inverted arch bottom drum uplift with topology optimization, for determining the reasonable radius of curvature of the inverted arch; Compared key parts of the inverted arch tunnel safety coefficient before and after the optimization, demonstrated the feasibility of topology optimization in of the tunnel structure optimization design, which provides the theoretical guidance for the inverted arch uplift pool tunnel damages.(3) Using the theory of topology optimization, where mainly built under the changsha metro line 1, with numerical simulation for typical sections stratum reinforcement ring to determine formation buckstay reasonable position and range, ensure the smooth construction and building subway shield tunnel and the security of content.