Anti-Analysis Of Displacement Of Supporting Structure For Tunnel Of Tian Chiping

Under the premise of rapid economic development in China, either road or railway are constructed in full swing, especially high-speed railway have a big step forward in recent years, there are more strict requirements for the design and construction of tunnel, it can be bound to bring a lot of problems and difficulties on technology. With the use and popularization of computer technology in tunnel, theory of numerical analysis and simulation methods about aspects of tunnel problems will continue to mature. Many theoretical analysis and research are based on reasonable and engineering parameters of rock mechanics. Under normal circumstances, the parameters of rock mechanics from field experiments and laboratory experiments have a big difference from parameters of rock mechanics in actual project, it is difficult to reliable design and safety construction, and it blocks the application and popularization of numerical method in tunnel. This paper relies on the project of Tianchiping tunnel on LanYu railway; research the system about back analysis of displacement. The system has based on the module of optimization design in ANSYS software, and inverse the actual project parameters of rock mechanics.Main research contents and methods:(1) The paper takes on-site measuring data of displacement in "The 50 Meters Testing in Tianchiping Tunnel Monitoring Analysis Report" as the foundation, and extrates the displacement data of the research section. Regression analyze by numerical analysis software SPSS to get the final displacement value;(2) Select a suitable way of tunnel excavation for soft rock. Refer to the existed, related information of the tunnel selecting the initial parameters for simulation calculation. And constructed the two-dimensional plane strain model by APDL language and ANSYS software, simulated the process of tunnel excavation, obtained the simulate value of observation section;(3) Using APDL language programmed the system of back analysis displacement based on the module of optimization design in ANSYS software. Using the zero-order and first-order optimization arithmetic inversed Young's modulus and side pressure coefficient. And testing the correctness of the inversion result.Main research achievements;(1) Measured data was fitted by regression analysis. Compare to three fitting function that appointed by engineering of tunnel, the logarithm function was best. And correlation coefficient of square value close to 1. Obtained final value of displacement conformed to the actual situation; (2) In optimizing inversion, using zero-order optimization arithmetic concluded roughly range about parameters that was the best optimal solution. Using first-order optimization arithmetic concluded the best global optimal solution about parameters.(3) Basically it verified the correctness of the back analysis model and result, so can better guided reliable design and safety construction in tunnel. The whole analyzed process and the analysis results in this paper also have a good reference value for similar project in the future.