基于正交试验的边坡安全系数影响因素敏感性分析

Sensitivity Analysis of Influencing Factors of Slope Safety Factor Based on Orthogonal Test

摘要: 为了研究边坡安全系数的影响因素，考虑边坡土体粘聚力、内摩擦角、体积模量、密度、抗拉强度及边坡倾角，采用FLAC^3D有限差分软件计算边坡安全系数，在分析模型网格疏密程度对计算结果影响规律的基础上，运用正交试验法对计算结果分析，研究影响边坡安全系数的各因素敏感性。研究结果表明，内聚力、内摩擦角、密度及边坡倾角对边坡安全系数的影响非常显著，敏感性影响程度从大到小依次为：内聚力、内摩擦角、密度、边坡倾角，且内聚力、内摩擦角与安全系数成正相关，边坡倾角、密度与安全系数成负相关；体积模量与抗拉强度对边坡安全系数的影响不显著。经过全长锚固支护后的边坡安全系数从0.96提高到1.22，锚杆支护在提高边坡稳定性方面有较好的效果。

Abstract: In order to study the influencing factors of slope safety factor, considering the cohesive force of soil mass, internal friction angle, volume modulus, density, tensile strength and slope inclination, FLAC^3D finite difference software was used to calculate the slope safety factor. On the basis of analyzing the influence law of model mesh density on the calculation results, orthogonal test method was used to analyze the calculation results. The sensitivity of factors affecting the safety factor of slope is studied. The results show that cohesion, internal friction angle, density and slope inclination have significant effects on slope safety factor, and the degree of sensitivity is as follows from large to small: cohesion, internal friction angle, density and slope inclination, and cohesion and internal friction angle are positively correlated with safety factor, while slope inclination and density are negatively correlated with safety factor. The influence of volume modulus and tensile strength on slope safety factor is not significant. The safety factor of the slope increased from 0.96 to 1.22 after the full length anchorage support, and the bolt support has a good effect on improving the stability of the slope.