水利学报2025，Vol.56Issue(12)：1584-1593,10.DOI:10.13243/j.cnki.slxb.20240795
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
摘要
Abstract
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 calcula-tion 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 dis-cretization 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 deforma-tion 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 deforma-tion for earth dams with polymer cutoff walls.In addition,the maximum settlement of the cutoff wall exhibits signifi-cant 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.关键词
高聚物防渗墙/堤坝/GPDEM/变异性/可靠度分析Key words
polymer cutoff wall/earth dam/GPDEM/variability/reliability analysis分类
建筑与水利引用本文复制引用
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):1584-1593,10.基金项目
国家自然科学基金项目(52109169) （52109169）
中国科协青年人才托举工程项目(YESS20230704) （YESS20230704）
中国博士后科学基金项目(2024T170842) （2024T170842）
河南省科技攻关项目(242102320015) （242102320015）
