Abstract: In order to simplify the construction procedure and shorten the construction period, the concrete crushing-type side wall(CSA) technology is widely adopted during constructing many concrete face rockfill dams(CFRD), in which the CSA replaces the traditional cushion as the contact interface with concrete slab. The construction specificity of CSA decides that the larger difference will exist between the contact relation between CSA and concrete slab and the one between cushion and concrete slab. Although recent construction technology has greater development than before, concrete slabs’ cracks of a few CFRD still occur seriously. Distributing rule of cracks for CFRD with CSA is not same with ones which adopt traditional cushion. The cracking of concrete slab has great relation with its stress state during construction period. At present the whole computation method of concrete slab stress analysis exists more simplification assume, which results in pour stress accuracy of concrete slab from computation results. Submodeling method is presented to compute the stress and deformation of concrete face slab considering CFRD constructed by stages. A contact friction element with no thickness based on coulomb friction model is applied to simulate the special boundary between CSA and concrete face slab. The actual project analysis result shows that the temperature decrease and the intense constrain with not flattening of upstream slope at some altitude bring about cracking of concrete slab.

Key words: concrete face rockfill dam, concrete crushing-type side wall, concrete slab crack, submodeling method, contact element