VG模型参数对边坡稳定性系数影响的敏感性分析

Sensitivity Analysis of Influence of VG Model Parameters on Slope Stability Coefficient

鉴于VG模型在国内外的广泛应用,本文选取砂土、粉土和粉质黏土,通过正交试验研究了VG模型系数n、α、饱和含水量θ_(s)、残余含水量θ_(r)以及饱和渗透系数K_(s),5个因素的扰动对边坡稳定性系数的影响,以边坡安全系数为正交试验的试验指标,研究发现对于砂土,敏感度关系是:θ_(s)>n>θ_(r)>α>K_(s);对于粉土敏感度关系:θ_(s)>n>α>K_(s)>θ_(r);对于粉质黏土敏感度关系:θ_(r)>θ_(s)>n>α>K_(s)。研究为实际工程提供了一定参考支持。

In view of the wide application of VG model at home and abroad,in this paper,sand,silt and silty clay are selected and the VG model coefficient n、α、saturated water content θ_(s)、residual water content θ_(r) and saturated permeability coefficient Ks are studied by orthogonal experiment.The influence of disturbance of five factors on slope stability is analyzed.The slope safety factor is the experimental index of the orthogonal test.The study found that for sand,the sensitivity relationship is:θ_(s)>n>θ_(r)>α>K_(s);for the sensitivity of silt:θ_(s)>n>α>K_(s)>θ_(r);for the sensitivity relationship of silty clay:θ_(r)>θ_(s)>n>α>K_(s).The research provides some reference support for practical engineering.