Seismic failure modes and seismic safety of Hardfill dam  

作　　者：Kun XIONG Yong-hong WENG Yun-long H 

机构地区：[1]Changjiang Institute of Survey, Planning, Design and Research [2]National Dam Safety Research Center [3]State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University [4]State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University

出　　处：《Water Science and Engineering》2013年第2期199-214,共16页水科学与水工程（英文版）

基　　金：supported by the research program of the National Dam Safety Research Center (Grants No.2011NDS021 and NDSKFJJ1103);the open fund of the State Key Laboratory of Hydraulics and Mountain River Engineering of Sichuan University (Grant No. 0912);the China Postdoctoral Science Foundation (Grant No. 2012M511594)

摘　　要：Based on microscopic damage theory and the finite element method, and using the Weibull distribution to characterize the random distribution of the mechanical properties of materials, the seismic response of a typical Hardfill dam was analyzed through numerical simulation during the earthquakes with intensities of 8 degrees and even greater. The seismic failure modes and failure mechanism of the dam were explored as well. Numerical results show that the Hardfill dam remains at a low stress level and undamaged or slightly damaged during an earthquake with an intensity of 8 degrees. During overload earthquakes, tensile cracks occur at the dam surfaces and extend to inside the dam body, and the upstream dam body experiences more serious damage than the downstream dam body. Therefore, under the seismic conditions, the failure pattern of the Hardfill dam is the tensile fracture of the upstream regions and the dam toe. Compared with traditional gravity dams, Hardfill dams have better seismic performance and ~reater seismic safety.Based on microscopic damage theory and the finite element method, and using the Weibull distribution to characterize the random distribution of the mechanical properties of materials, the seismic response of a typical Hardfill dam was analyzed through numerical simulation during the earthquakes with intensities of 8 degrees and even greater. The seismic failure modes and failure mechanism of the dam were explored as well. Numerical results show that the Hardfill dam remains at a low stress level and undamaged or slightly damaged during an earthquake with an intensity of 8 degrees. During overload earthquakes, tensile cracks occur at the dam surfaces and extend to inside the dam body, and the upstream dam body experiences more serious damage than the downstream dam body. Therefore, under the seismic conditions, the failure pattern of the Hardfill dam is the tensile fracture of the upstream regions and the dam toe. Compared with traditional gravity dams, Hardfill dams have better seismic performance and ~reater seismic safety.

关 键 词：Hardfill dam  seismic failure mode  seismic safety microscopic damage model 

分 类 号：TV64[水利工程—水利水电工程] TV312