多年冻土地区路堑边坡病害及其整治原则

Disaster of Cutting Slope in Permafrost Region and Treatment Principle

研究目的:针对多年冻土区路堑病害的类型划分、形成原因和主控因素进行分析研究,提出现有路堑边坡典型病害的整治原则,为多年冻土区路堑边坡病害整治提供借鉴。研究结论:热融型边坡失稳是高含冰量多年冻土路堑边坡的一种典型病害,产生的原因是冻结层上水和坡面吸热导致下卧高含冰量冻土融化。治理的原则是在注重热学防护和地表挡排水的同时,加强对上侧坡体冻结层上水的疏导,排泄堑内道路基床积水。岩质边坡喷射混凝土防护层破损是低含冰量多年冻土路堑边坡较为典型的病害形式,也与冻结层上水向坡面的聚集有关。整治原则是加强边坡混凝土层下水分的排泄,拆除可能影响行车的破损混凝土层,换做锚杆框架等不阻挡坡面水分排泄的结构。原则上说,在多年冻土区,封闭坡面的工程措施是不可取的。

Research purposes：The study is done on the types classification,causes and controlling factors of the diseases of cutting slopes in permafrost region and the principles of treating the existing typical diseases of cutting slope are offered for providing the reference to treating the disease of cutting slope in permafrost region.Research conclusions：For the cutting slope in permafrost region with the high ice content,the destabilization of thaw slope is a typical disease and the reason for it is there is the water on freezing layer and slope absorbs heat to cause the high-ice-content frozen earth thawing.The treatment principle for it is to strengthen dredging water in the freezing layer of the upper slope and draining the water in cutting of roadbed while emphasizing on the thermal protection and draining water in the surface.For the cutting slope in permafrost region with low ice content,the damage of shotcrete protective covering of rock slope is a typical disease and it is related to the water gathering on the freezing layer toward slope.The treatment principles for it is to strengthen water drainage under the concrete layer of slope,remove the damaged concrete layer that brings harm to the traffic safety,and build the light slope protection structures,like frame anchor that does not hold the water back when the concrete layer is broken.In principle,sealing the cutting slope in permafrost region is inadvisable.