土质边坡稳定影响因素的敏感性分析

Sensitivity Analysis of Affecting Factors for Soil Slope Stability

为确定各个因素对边坡稳定性的影响程度,以一均质土质边坡为例,选取土容重、粘聚力、内摩擦角、地下水位、坡比为试验因素,运用单因素分析法和多因素正交试验法分析各个影响因素的敏感性。采用极限平衡法计算不同试验方案下边坡的稳定安全系数,以安全系数为试验指标,对试验结果进行极差分析。结果表明:单因素分析法和多因素正交试验法得到的因素敏感性变化规律基本一致,坡比的敏感性最大,其次分别是内摩擦角、粘聚力、重度,地下水位的敏感性最小;多因素正交试验法比单因素分析法的计算更显合理。

There was many factors affecting the stability of slope, the influence of various factors for the slope stability was also different.For example of a soil slope, taking severe, cohesive force, internal friction angle and underground water level, slope ratio as experiment factors, single factor analysis and multi-factor orthogonal experiment were used to analyze the sensitivity of factors, the limit equilibrium method was adopted to calculate the safety factor of slope in different experiment projects, taking the safety factor as experiment target, the method of range analysis was used to analyze the experimental results.It showed that the results were basically identical with single factor analysis and multi-factor orthogonal experiment, slope ratio was of the largest sensitivity, then followed internal friction angle、cohesive force、severe, and the minimal sensitivity was the underground water level, multi-factor orthogonal experiment was more reasonable than the analysis using single factor.