多年冻土地区斜坡稳定性评价问题  

Stability Evaluation of Slopes in Permafrost Region

作　　者：牛富俊[1] 马立峰[1] 靳德武[2] 

机构地区：[1]中科院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000 [2]长安大学地测学院,西安710054

出　　处：《工程勘察》2006年第6期1-3,17,共4页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金项目(No.40471023);中国科学院知识创新工程重大项目(No.KZCX1-SW-04)资助

摘　　要：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.

关 键 词：多年冻土 斜坡稳定性 渗流 评价方法 

分 类 号：TU457[建筑科学—岩土工程]