隧道衬砌结构可靠指标计算方法的研究

Research on Computation Methods for Structural Reliability Index of Tunnel Lining

本文采用有限元－响应面法及Ｍｏｎｔｅ－Ｃａｒｌｏ模拟获得衬砌结构内力的特征参数，并以此为基础，利用五种结构可靠度分析法计算明洞与隧道衬砌结构可靠指标，经对比得出Ｔｒｙｍ法求出的隧道衬砌结构可靠指标最小。

This paper applies a method that combined the finite element response surface method with Monte Carlo simulation to calculate the formulation of hyper curved surface and the characteristic parameters of force in tunnel lining structure.Then the limit state equations of tunnel lining structure are established on the basis of the information obtained by means of the recent investigation and research.On these grounds,the validity of five reliability analysis methods is verified in calculating the structural reliability index( β ) of cut and cover tunnel and tunnelling.Comparing and analogizing the process and results of computing reliability index β by utilizing every method,this paper makes a conclusion that all the TRYM method,NEW GZ method,and RBDF method can calculate the value of the structural reliability index of lining,but TRYM method has an advantage over the others.