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隧道围岩参数是判断隧道围岩及衬砌稳定性的重要手段,是隧道安全预警系统的重要组成部分。对于采用新奥法施工的隧道,通过对围岩收敛进行实时监控,并利用有限元软件ANSYS建立隧道开挖过程收敛变形的正演模型,得到了围岩收敛的数值解,在此基础上根据系统识别理论建立了隧道围岩参数反演分析方法,并结合工程实例反演得到了围岩参数。研究成果可为隧道开挖过程中围岩的稳定性评估提供依据,也为相关隧道的设计施工提供参考依据。
Tunnel surrounding rock parameters are important means to judge the stability of surrounding rock and lining of tunnel and are an important part of tunnel safety early-warning system. For tunnels constructed with the new Austrian law, the numerical simulation of surrounding rock convergence is obtained by monitoring the surrounding rock convergence in real time and using the finite element software ANSYS to establish the convergence model of tunnel excavation process. Based on this, The system identification theory establishes the tunnel surrounding rock parameters inversion analysis method, and combined with the engineering example inversion obtains the surrounding rock parameter. The research results can provide the basis for the stability assessment of the surrounding rock in tunnel excavation and also provide reference for the design and construction of the relevant tunnels.