边坡可靠性指标及敏感性因素分析

Analysis and Calculation of Slope Reliability and Sensitivity Factors

我国铁路规范拟从容许应力设计方法转轨采用极限状态法。论文的研究内容为铁路规范的转轨提供了部分研究结果,首先推导了路堑边坡极限状态方程及可靠度指标的计算公式,然后采用JC法,计算了边坡的可靠指标,基本正态分布在2.5左右,取可靠度指标为2.5,失效概率为0.62%。然后计算分析了土性参数中γ值、c值与φ值的变异性对可靠指标的影响,其中γ值和列车荷载的变异性对可靠指标的影响不大,c值与φ值的变异性对可靠指标的影响较大。

The limit state design method will be used in Chinese Railway Standard to replace the allowable stress design.Some research results are provided in this paper.Firstly, the formula of limit state equation and the reliability index of cutting slope is derived; secondly, with JC method, the reliability index of slope is calcu-lated to be about 2.5, and the probability of failure is about 0.62%; In the end, the calculation and influence analysis of soil parameters in the gamma value variation, C value variation and φvalue variation to the value of re-liability index are given.From the calculated result, gamma value and train load variability have little effect on the reliability index while the effects of C value variation and the φvalue variation to the reliability index is big-ger.