Abstract：Research purposes: At present，the design and stability calculation for the railway dyke in declining gully for water retaining and diversion is on the base of those for the hydraulic rolled—earth dam，but the borne load and stability condition of railway dyke are different from hydraulic dam．As a litde research has been done on this field，SO a set of mature design and calculation method has not been formed for the railway dyke yet．In this paper，the analyses are made for the stability of one railway dyke built in declining gully．
Research conclusions: (1)The stability of dyke in declining gully is influenced by the lowering base gradient，the cohesion of base contact surface and friction coefficient．(2)It is inappropriate to build a dyke on the ground directly when ditch gradient is more than 5％，and the dyke base should be made flat if possible．(3)It is appropriate to regard the cohesion of base contact surface as zero because the base contact surface is immersed in water for long term to drop the cohesive performance．
2009, Vol. 26 
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