1．China Academy of Railway Sciences，Beijing 10008 1，China 2．Northwest Research Institute Co．Ltd of China Rail—way Engineering Corporation，Lanzhou，Gansu 730000，China
Abstract：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．
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2010, Vol. 27 
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