瀑布沟高堆石坝应力变形分析  

Analysis of stress deformation of Pubugou high rock-fill dam

作　　者：吴伟雄[1] 何文社[1] 王军玺[1] 李琼[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《东北水利水电》2018年第3期60-62,共3页Water Resources & Hydropower of Northeast China

基　　金：国家自然科学基金:初次蓄水土质心墙坝水力劈裂分析理论及其应用(51469012);渠冰生消机理对西部寒旱地区输水工程的破坏性研究(51669010)

摘　　要：近年来,有很多专家学者对瀑布沟堆石坝进行了有限元分析,但都基于二维有限元分析和邓肯张E-μ模型,本文基于邓肯张E-B模型总结和选取了肯张E-B模型参数,建立瀑布沟堆石坝三维有限元模型,分析了其施工期和蓄水期应力和变形情况并和肯张E-μ模型计算结果做了对比分析。计算结果表明:大坝最大沉降和最大水平位移均发生在库水位蓄满期;心墙拱效应现象最强烈的位置大约在1/3坝高坝轴线附近,存在拱效应的部位心墙应力呈驼峰状分布,拱效应在坝体顶部很小,拱效应最大发生在心墙与高塑性黏土接触部位;对两种模型对比分析可知,两种模型计算结果相差不大,坝体变形和应力符合一般规律。In recent years, many experts and scholars have made finite element analysis for the Pubugou rock-fill dam, but their analysis were all based on two-dimensional finite element analysis and Duncan-chang E-μ model. Based on the summary of Duncanchang E-B model and the parameters of the Duncan-chang E-B model, the three-dimensional finite element model of Pubugou rock-fill dam is built, the paper analyzes the stress and deformation in construction period and storage period, and compared the situations with the calculation results by Duncan-chang E-μ model. Some results have been obtained. The maximum sedimentation and maximum horizontal displacement of dam both appear in the period when the reservoir is full. The most powerful position of core wall arching effect is nearly the dam axis at a third of the dam height, the stress of core wall with arching effect presents a hump-shaped distribution,the arching effect is weak at the dam top and the biggest arching effect occurs at the contact part of core wall and high plastic clay.Through the comparison and analysis of the two models, the calculation results of two models are not much difference and the deformation and stress of dam body are consistent with the general rule.

关 键 词：瀑布沟堆石坝 心墙 拱效应 邓肯张E-B模型 有限元 

分 类 号：TV641[水利工程—水利水电工程]