Seismic reliability analysis of high earth-rock fill dams based on an improved cloud method
JIN Congcong1,2,CHI Shichun1,2,LI Shijie3,NIE Zhangbo1,2
1.Faculty of Infrastructure Engineering，Dalian University of Technology，Dalian 116024，China;
2.State Key Laboratory of Coastal and Offshore Engineering，Dalian University of Technology，Dalian 116024，China;
3.Kunming Engineering Corporation Limited of Power China, Kunming 650051, China
Abstract：The seismic reliability of high earth-rockfill dams is of very significance in the study of earthquake resistance, disaster prevention and risk assessment of earthquake damage of dams.Considering the double randomness on seismic ground motions and dam material parameters, a seismic reliability model for high earth-rockfill dams based on seismic fragility and the probability density function of peak acceleration was established, which provides a basis for the seismic reliability estimation of high earth-rockfill dams with different design working life.The samples of dam material parameters were selected by Latin sampling method and combined with selected ground motions to compose sample pairs.The crest relative seismic settlement was selected as the performance parameter and the fragility performance level considering the seismic fortification standard was proposed.Then, the SWANDYNE II program was utilized to calculate the dynamic responses of the dam.By virtue of an improved cloud method, the seismic fragility 3D surface of the crest relative seismic settlement under different peak acceleration was obtained.According to the probability distribution function of the Nuozhadu high earth-rockfill dam with different design years and the seismic fragility surface, the failure probability and seismic reliability of the dam with different design years were determined.The analysis results illustrate that with the increase of design working life, the seismic reliability of each performance level of the Nuozhadu dam decreases continuously, and the reliability of the dam with different design life can all satisfy the requirements of the unified standard for the reliability design of hydraulic and hydropower engineering structures in the condition of serious damage.The seismic reliability analysis of the Nuozhadu high earth-rockfill dam indicates that its seismic design is reasonable from the viewpoint of deformation.
靳聪聪1,2，迟世春1,2，李士杰3，聂章博1,2. 基于改进云图法的高土石坝抗震可靠度分析[J]. 振动与冲击, 2020, 39(2): 169-177.
JIN Congcong1,2,CHI Shichun1,2,LI Shijie3,NIE Zhangbo1,2. Seismic reliability analysis of high earth-rock fill dams based on an improved cloud method. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(2): 169-177.
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