Analysis Of Damage Of Impervious Structure For Concrete Faced Rockifll Dam

Concrete faced rockfill dam (CFRD) with many of advantages,such as safe, economic adapt to environmented and climatic conditions, many engineers are more like it. CFRD is currently the most widely used and fastest growing type of dam. Face slab and high toe wall as the main impervious structure are the most important body of the whole dam. To ensure its safety and work reliably is the primary problem to engineers.At present, the development of concrete face rockfill dam is facing from200m to300m level dam across the technical challenges, especially in this ultra-high concrete face rockfill dam, under high stress field rockfills severely broken, dam large deformation, can lead to rupture of the panel, thereby threatening the safe operation of the dam. Longitudinal tensile stress due to the panel’s relatively large changes in static and dynamic analysis of coagulation concrete face rockfill dam, using linear elastic model application has some limitations.The present research is supported by National Natural Science Foundation Research Program Integration Project (ID:91215301), the National Natural Science Foundation of China (No.:51379028;51279025), New Century Excellent Talents Support Program (Grant No.: NCET-12-0083) and the seismic industry research special funding project (ID:201208013) In this paper, plastic damage model of concrete which considering the damage, crack of concrete, stiffness degradation and strain softening properties was used in the analysis of CFRD. This paper simulated the damage of face slab occurrence and development process and verified plastic damage model can apply in the analysis of CFRD.Through the analysis of CFRD in the static stage and dynamic stage. The results showed that the slab’s maximum slope-direction tensile stress occurred at the height of0.65of the dam and resulted in the slab’s tensile damage at this position during earthquake. Also, the slab’s tensile damage occurred at the height of0.85of the dam because of the "whiplash effect". The plastic damage model of concrete can reflect the damage process of the slab precisely. The damage variable could be used for the analysis of the slab’s damage distribution and weakness position. The research results could provide effective method for the study of the limit aseismic capacity and the aseismic design of the CFRD.The plastic-damage model of concrete and the eleatic-plastic model of rock are applied to analyze the high to wall of2D-CFRD under the static state and the action of strong earthquake. The result shows that the upstream and downstream of high to wall withstand tensile stress and compressive stress while on the construction and storage process. The maximum tensile stress occurs in the bottom of the high to wall. The damage appeared because of the tensile stress exceeds the strength of concrete. The damage of high to wall at the bottom increases during earthquake, the maximum of index more than0.8. At the top of high to wall, the maximum of index little than0.6. The damage index could be used for the analysis of the high to wall’s damage development process. The research results could provide theoretical support for the aseismic design of the CFRD.