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| 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 |
| Seismic deformation reliability analysis of polymer cutoff wall earth dam considering soil parameter variability |
| 投稿时间：2024-12-07 修订日期：2025-04-09 |
| DOI： |
| 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（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（2024T170842），河南省科技攻关项目（242102320015） |
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| 中文摘要: |
| 目前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，未考虑其变异性，导致计算结果存在偏差。因此，本文基于Karhunen-Loève (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0.05 g，0.1 g，0.2 g和0.4 g）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0.05 g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: |
| At present, when analyzing the static and dynamic response of the polymer cutoff wall earth dam, the soil parameters of the dam are usually simplified as the spatial uniform distribution, and the variability is not considered, which leads to the deviation of the calculation results. Therefore, based on Karhunen-Loève (K-L) expansion method and generalized probability density evolution method (GPDEM), a seismic deformation reliability analysis method for polymer cutoff wall earth dam considering soil parameter variability is established in this paper. The K-L expansion method is used to discreteness soil parameter random fields. As a newly developed reliability analysis method, GPDEM is applied to the evaluation of seismic deformation reliability of earth dams. Then, taking the vertical permanent deformation value of dam top under the homogeneous field model as the safety control index, the seismic deformation reliability of earth dam considering the soil parameter variability is obtained. Finally, the influence of different peak ground accelerations (PGA is 0.05g, 0.1g, 0.2g and 0.4g) on the settlement of polymer cutoff wall earth dam is compared. The results show that the maximum vertical permanent deformation of the dam crest increases by 5.81% on average after the input of the seismic wave with a 0.05g PGA, ignoring the soil parameter variability will overestimate the seismic deformation reliability of the polymer cutoff wall earth dam. In addition, the maximum settlement value of the cut wall presents a large randomness within a certain range. With the increase of PGA, the influence of soil parameter variability on the cutoff wall will be amplified, resulting in further increase in the failure probability of the earth dam. |
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