基于系统识别方法的隧道围岩参数反演分析

Back Analysis of Tunnel Rock Parameters Based on System Identification Method

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。

The parameters of tunnel surrouding rock are the important basis for evaluating the stability of rock and liner,and this procedure is the important component of tunnel safety system.The forward model of surrounding rock convergence is established by means of finite element software Ansys and monitoring,then the numerical solution of surrounding rock convergence is carried out.On this basis,the back analysis method of Rock Parameters is established and the result is obtained according to system identification theory and project example.The research results could provide foundation for the judgment of surrouding rock stability during the tunnel excavating,and also provide the reference for the design and construction of tunnel.