Seismic responses of an asphalt concrete core wall dam considering the spatial variability of overlay foundation materials
LUO Bohua1，SONG Zhiqiang1，WANG Fei1，LIU Chen2，LIU Yunhe1
1. Institute of Water Resources and Hydro-Electric Engineering, Xi’an University of Technology, Xi’an 710048, China;
2. China Railway First Survey and Design Institute Group Co., Ltd., Xi’an 710043, China
Abstract：The uncertainty of the parameters of the overburden soil layer often significantly affects the seismic response of the dam with asphalt concrete core. the spatial random field simulation technology is combined with the finite element method , according to the sensitivity analysis results of dynamic equivalent linear model, dynamic random parameters are selected, the spatial variability of covering material parameters is considered by using normal or lognormal distribution functions, Gaussian autocorrelation function is used to consider the spatial correlation, the random parameter library was generated by covariance decomposition of python, and secondary development of scripts for abaqus. Based on Monte Carlo method, the random field simulation of spatial correlation and difference of covering materials and the calculation of "non-invasive" stochastic finite element are realized. Take a practical project as an example, the random static parameters, dynamic parameters and static and dynamic parameters of overburden materials are considered respectively, the statistical law and probability distribution test of the mean value, coefficient of variation and 95% confidence interval limit of asphalt concrete core dam crest, core crest horizontal peak acceleration and vertical permanent deformation of the dam body are analyzed. The results show that: considering the random probability of overburden material parameters will increase the seismic response of dam body; at the same time, considering the random static and dynamic parameters, the difference between the seismic response and the determined value is the largest; the statistical results of seismic response of dam body do not necessarily conform to normal or lognormal distribution; the influence of spatial difference of overburden material on peak acceleration is greater than that on permanent deformation; The dispersion degree of seismic response results of overburden is larger than that of dam body and core wall.
罗博华1，宋志强1，王飞1，刘琛2，刘云贺1. 考虑覆盖层地基材料空间变异性的沥青混凝土心墙坝地震响应研究[J]. 振动与冲击, 2022, 41(2): 53-63.
LUO Bohua1，SONG Zhiqiang1，WANG Fei1，LIU Chen2，LIU Yunhe1. Seismic responses of an asphalt concrete core wall dam considering the spatial variability of overlay foundation materials. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(2): 53-63.
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