呼伦贝尔多年冻土区工程病害与冻土工程 地质特征及评价

Characteristics and Evaluation of Engineering Geology of Permafrost in Hulunbuir

呼伦贝尔多年冻土区不良地质现象导致的工程病害有沉陷、冻胀、冰锥、涎流冰、冰丘、热融湖等现象。沉陷是工程遭受破坏相对普遍的现象。同时,季节活动层反复冻融引起的病害亦不能忽视。多年冻土自北向南分Ⅰ、Ⅱ和Ⅲ区,冻土工程类型多样,Ⅰ和Ⅱ区高含冰量土分布更为广泛;Ⅰ区西北部有低温不稳定区,其它为高温不稳定区和极不稳定区,冻土呈逐年退化状态。冻土不良地质现象发育,工程地质条件较差、极差地段交错分布。

The engineering diseases caused by adverse geological phenomena in the Hulunbuir permafrost area include subsidence,frost heave,ice picks,salivary ice,ice mounds,thermal melting lakes,etc.Subsidence is a relatively common phenomenon of engineering damage.Secondly,the diseases caused by repeated freezing and thawing of the seasonal active layer cannot be ignored.The permafrost is divided into zones I,II and III from north to south.There are various types of permafrost engineering,and the high ice content soils in zones I and II are more widely distributed.In the unstable area,the frozen soil is degraded year by year.Permafrost has developed adverse geological phenomena,poor engineering geological conditions,and extremely poor sections are staggered.