黏聚力与内摩擦角互相关性对边坡稳定可靠度的影响

基于3种计算假定条件和5类土工参数概型分布组合，定义两种差异系数，分析黏聚力c，内摩擦角φ互相关性对边坡稳定可靠度指标计算结果的影响。结果表明:当概型分布不同时，同种工况下可靠度指标计算结果差异较大；当c，φ的相关系数介于-0.6~-0.8之间时，将c，φ视为相互独立变量会引起可靠度指标计算结果有15%～30%的误差；并建议当c，φ的负相关性强于-0.5时，应考虑其由非正态变量转换为正态变量相关系数的变化。

Influence of Cross-correlation of Cohesive Force and Internal Friction Angle on Reliability of Slope Stability

Depending on three assumptions and five groups of geotechnical parameters distribution, two coefficients of variation were defined to analyze the influence of cross-correlation cohesive force c and internal forction angle φ on the calculation result of reliability index for slope stability. The result shows that, when the probability type of distribution is different, there comes out relatively large difference between the calculation results of reliability index in the same working conditions; when c,φ correlation coefficient is between -0.6 and -0.8, there causes 15%~30% error of the calculation result of reliability providing that c,φ are considered as independent variables. It is suggested that the transformation of c,φ negative correlation from non-normal to normal variable should be considered when c,φ negative correlation is stronger than -0.5.