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陕西地区黄土路堑高边坡可靠度研究

, PP. 18-25

Keywords: 道路工程,黄土边坡,Monte-Carlo法,可靠度,失效概率

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Abstract:

?以极限状态坡作为输入坡型,将陕西黄土地区公路勘察中实测的粘聚力和内摩擦角作为主要随机变量参考值,采用Monte-Carlo法抽样,简化Bishop法公式作为控制方程,对陕西地区3个地段的黄土高边坡进行了可靠度模拟,获得黄土高边坡的失效概率与可靠指标。经过对参数变异性与失效概率关系的系统分析,并考虑陕西地区黄土强度参数变异系数的分布特点和工程可接受水平,提出了陕西地区黄土路堑高边坡可靠度设计标准。结果表明:对于高速公路和一级公路,设计失效概率为7%~10%,相应可靠指标为1.28~1.48;对于二级及二级以下公路,设计失效概率为14%~16%,相应可靠指标为0.99~1.08。

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