基于可靠度理论的路堤稳定安全性分析

笔者以可靠度理论为基础 ,考虑路堤土体的非线性特性。运用非线性有限元分析方法 ,与可靠度计算程序结合使用 ,得出应力水平、抗剪强度可靠指标的等值线图 ,从而分析路堤稳定的安全系数和可靠指标。并且提出通过降低c和 φ值的方法 ,得出路堤稳定的安全储备系数。实例结果表明 ,当高填方路堤的设计安全系数接近规范允许值时 ,通过笔者的分析方法可得到满意的结果。笔者的方法对高填方路堤的稳定安全性分析和路堤边坡设计具有重要参考价值。

Security Analysis of Embankment Stability Based on Reliability Theory

Based on confidence level theory,nonlinear property of embankment soil is. By applying non-linear finite element analysis, and combining with confidence level computing program, isoneph contour of stress level and shear resist intensity is obtained, by which the security coefficient and confidence index are analyzed. Then by reducing c and φ values, the security reserve coefficient of embankment stability is obtained. The exemplified case shows that when the design planning security coefficient of high fill embankment is close to the value of specification, satisfactory result could be obtained. The method is referable to security analysis of embankment stability and slope design.