多年冻土地区斜坡稳定性评价问题

Stability Evaluation of Slopes in Permafrost Region

根据土体温度的截然不同,多年冻土区的斜坡稳定性可以简单地划分为正冻土斜坡稳定性和正融土斜坡稳定性两大类。正冻土斜坡的变形以蠕变为主,基于蠕变,文中介绍了坡体不同深度处变形速率的计算方法。正融土斜坡变形与失稳兼顾了蠕变、滑动、坍塌和倾倒等几种变形与破坏,其中地下冰的融化在斜坡失稳中起到了十分重要的作用。基于典型热融滑塌型斜坡失稳,针对不同的渗流条件建立了其稳定性评价方法。

Based on the status of ground temperature, the stability of slopes in permafrost regions can be classified into two types the stability of frozen-soil slopes and the stability of thawing-soil slopes. Deformations of the frozen-soil slopes are dominated by the secondary-stage creep of frozen soils. The method for the calculation of the deformation rate of slope body at different depths is introduced based on the creep. The deformation and the failure of thawing-soil slopes combine the features of the creep, slide, collapse and falling down. The melting water from the ground ice plays a very important rule on the failure of slopes. Through the failure of thawing-soil slope the method for the stability evaluation of the slope with different seepage conditions is presented.