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

罗博华1,宋志强1,王飞1,刘琛2,刘云贺1

振动与冲击 ›› 2022, Vol. 41 ›› Issue (2) : 53-63.

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (2) : 53-63.
论文

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

  • 罗博华1,宋志强1,王飞1,刘琛2,刘云贺1
作者信息 +

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
Author information +
文章历史 +

摘要

河床覆盖土层参数不确定性往往显著影响其上覆沥青混凝土心墙坝的地震响应。将空间随机场模拟技术与有限元方法相结合,根据动力等效线性模型参数敏感性分析结果选取动力随机参数,采用正态或对数正态分布函数考虑覆盖层材料参数的空间变异性,采用高斯型自相关函数考虑空间相关性,采用python进行协方差分解法生成随机参数库,并对abaqus进行脚本二次开发,实现了基于蒙特卡罗法的覆盖层材料空间相关性及差异性的随机场模拟和“非侵入式”随机有限元的计算。以某实际工程为例,分别考虑覆盖层材料静力参数随机、动力参数随机和静动力参数均随机进行分析,分析沥青混凝土心墙坝坝顶、心墙顶水平向峰值加速度和坝体竖向永久变形的均值、变异系数及95%的置信区间限值等统计规律及概率分布检验。结果表明:考虑覆盖层材料参数的随机大概率会引起坝体地震响应增大;同时考虑静动力参数随机时的地震响应与确定值相差最大;坝体的地震响应统计结果不一定符合正态或对数正态分布;考虑覆盖层材料空间差异性对峰值加速度的影响大于对永久变形的影响;覆盖层地震响应结果的离散程度大于坝体及心墙。

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.

关键词

沥青混凝土心墙坝 / 随机有限元 / 覆盖层 / 空间变异性 / 地震响应

Key words

asphalt concrete core dam;  / stochastic finite element method;  / overlay layer;  / spatial variability;  / seismic response

引用本文

导出引用
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[J]. Journal of Vibration and Shock, 2022, 41(2): 53-63

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