基于点估计法的黄土边坡可靠度研究

在不同的黄土地区选取4个工点的典型路堑高边坡,基于点估计理论和有限元强度折减法计算边坡可靠指标。结果表明:工点2的稳定系数虽达到1.46,却有19.2%的失效概率; 工点1和4的坡型、地层岩性及层厚等工况较接近,失效概率差值达29.8%,参数变异性是造成其差异的主要原因。用点估计法计算边坡可靠度,并采用可靠度理论分析黄土边坡稳定性,能较好的解决土性参数离散性对边坡稳定性评价的影响。

RESEARCH ON LOESS SLOPE RELIABILITY BASED ON THE POINT ESTIMATE METHOD

Based on the point estimate method and finite element strength reduction method,this paper calculates the reliability indexes of 4 typical cutting slopes in different loess regions.The results show that: the stability coefficient of case 2 is 1.46,but its failure probability is 19.2%;although case 1and 4are similar in slope type,the lithology and layer thickness,etc,the difference between their failure probabilities can reach 29.8%,parameter variation is the main reason of causing the difference.Using point...