为了验证倾斜加载方式导致滑坡失稳过程发生的应力场变化是否与原型相似,通过建立倾斜模型和原型滑坡的数值模型,观察破坏过程中应力应变场的相近程度,并引入基于Mohr-Coulomb屈服准则的破坏接近度函数这一概念,把每个单元的矢量信息转换为标量信息,得到2个模型的破坏接近度值相关系数,以相关系数的大小来评价模型与原型破坏过程中应力场的相似性。以千将坪滑坡为例,得出2个数值模型的破坏接近度指标变化趋势大致相同;且当折减系数为1.85,倾斜角度为[7°,8.9°]时,相关系数范围是[0.7,1.0],表明倾斜模型与原型破坏时的应力场相似,证明了倾斜加载方式能较好地重现滑坡的发生过程。

In this article, the similarity of stress field during landslide failure between inclined loading mode and prototype was researched. Numerical models of inclined loding mode and prototype were built, and the similarities of stress and strain field between the two models were observed.Failure approach index based on Mohr-Coulomb yield criterion was introduced to transfer the vector information of each element into scalar information so as to obtain the coefficient of correlation between the failure approach indexes of the two models. Hence the similarity of stress field during failure between the two models can be assessed. With Qianjiangping landslide as an engineering example, the change trend of failure approach index of the two models were verified to be close to each other. When reduction factor was 1.85 and inclination angle was [7°, 8.9°], the range of correlation coefficient was [0.7, 1.0], indicating that the failure stress fields of inclined loading mode and prototype were similar. The results suggest that inclined loading mode could well reflect landslide failure process.