| 薛冰寒,徐瑞超,张舒,方宏远,王复明.考虑土体参数变异性的高聚物防渗墙土坝地震变形可靠度分析[J].水利学报,2025,56(12):1584-1593 |
| 考虑土体参数变异性的高聚物防渗墙土坝地震变形可靠度分析 |
| Reliability analysis of seismic deformation for earth dams with polymer cutoff walls consider? ing soil parameter variability |
| 投稿时间：2024-12-07 修订日期：2025-12-22 |
| DOI：10.13243/j.cnki.slxb.20240795 |
| 中文关键词: 高聚物防渗墙 堤坝 GPDEM 变异性 可靠度分析 |
| 英文关键词: polymer cutoff wall earth dam GPDEM variability reliability analysis |
| 基金项目:国家自然科学基金项目（52109169）；中国科协青年人才托举工程项目（YESS20230704）；中国博士后科学基金项目（2024T170842）；河南省科技攻关项目（242102320015） |
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| 中文摘要: |
| 对高聚物防渗墙土坝进行静动力响应分析时，通常将堤坝土体参数简化为空间均匀分布，由于不考虑其变异性，导致计算结果存在偏差。本文基于K-L展开法和广义概率密度演化方法（GPDEM）建立了考虑土体参数变异性的高聚物防渗墙土坝地震变形可靠度分析方法，K-L展开法用于进行土体参数随机场的离散，GPDEM作为新发展的可靠度分析方法被应用于土坝地震变形可靠度的评估。然后，以高聚物防渗墙土坝均质场模型下坝顶竖向永久变形值为安全控制指标，得到了考虑土体参数变异性的土坝地震变形可靠度。最后，对比分析了不同地震动峰值加速度（PGA为0.05g、0.1g、0.2g和0.4g）对土坝高聚物防渗墙墙体沉降的影响规律。结果表明：在输入最大峰值加速度为0.05g的地震波后，坝顶的最大竖向永久变形值平均增加了5.81%，忽略土体参数变异性会高估高聚物防渗墙土坝地震变形可靠度。此外，防渗墙墙体最大沉降值在一定区间内呈现较大的随机性，随着PGA的增加，土体参数变异性对防渗墙的影响会被放大，导致土坝的失效概率进一步增大。 |
| 英文摘要: |
| In the static and dynamic response analysis of earth dams with polymer cutoff walls，the soil parameters of the dam are usually simplified as spatially uniform，neglecting their variability，resulting in deviations in the calculation results. Based on the Karhunen-Loève（K-L）expansion method and the generalized probability density evolution method（GPDEM），a reliability analysis method for the seismic deformation of earth dams with polymer cutoff walls considering soil parameter variability was established in this paper. The K-L expansion method was used for the discretization of the soil parameter random fields，while GPDEM，as a newly developed reliability analysis method，was applied to evaluate the reliability of seismic deformation for earth dams. Then，using the vertical permanent deformation at dam crest under a homogeneous field model of the polymer cut-off wall earth dam as the safety control index， the reliability of seismic deformation for earth dams considering soil parameter variability was obtained. Finally，a comparative analysis was conducted on the influence of different peak ground accelerations including 0.05g，0.1g， 0.2g，and 0.4g on the settlement of the polymer cut-off wall in the earth dam. The results show that after inputting seismic waves with a maximum PGA of 0.05g，the maximum vertical permanent deformation at dam crest increased by an average of 5.81%. Neglecting the variability of soil parameters overestimates the reliability of seismic deformation for earth dams with polymer cutoff walls. In addition，the maximum settlement of the cutoff wall exhibits significant randomness within a certain range. With the increase in PGA，the influence of soil parameter variability on the cutoff wall is amplified，resulting in a further increase in the failure probability of earth dams. |
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