公路弃土场边坡的稳定影响因素敏感性分析

Sensitivity Analysis of Influencing Factors to Slope Stability In Highway Spoil Slope

以日照市岚山区某弃土场为研究对象,通过对现场调研并采样开展直剪试验,在压实度分别为90%、92%和95%的情况下取得不同的黏聚力c和内摩擦角φ值,通过MIDAS GTS NX进行数据模拟,选取Mohr-Coulomb模型,采用有限元强度折减法(SRM)算出边坡的等效应变塑性区及安全系数,以此分析边坡稳定性。利用数值模拟的结果,分别绘制坡高、坡比与安全系数的关系图,归类分析不同坡高和坡度对边坡稳定性系数的变化规律。通过边坡稳定影响因素的敏感性分析,分析影响边坡稳定性各因素与边坡安全系数之间的相关性,即分析各因素的变化对于边坡安全系数的影响程度。

Taking a spoil slope in Lanshan district of Rizhao city as the research object,through carrying out direct shear test and sampling in field investigation,different values of cohesive force c and internal friction Angleφhave been obtained when the compactness is 90%,92%and 95%respectively.By using MIDAS GTS NX for data simulation,mohrCoulomb model has been selected,and strength reduction method with finite element(SRM)has been used to calculate the equivalent strainplastic zone and safety factor of slope.Based on the results of numerical simulation,the relationship diagrams of heigh,slope and safety factor have been drawn respectively,and the transformation rules of slope stability factor with different height and slope have been classified and analyzed.Through sensitivity analysis of influencing factors of slope stability,the correlation between factors affecting stability and slope safety factor has been analyzed.The influence degree of the change of each factor on the slope safety factor has been analyzed.