沥青混凝土心墙堆石坝应力变形有限元分析  

Finite element analysis of stress and deformation on rockfill dam with asphaltic concrete core wall

作　　者：涂幸[1] 李守义[1] 李炎隆[1] 王国辉[2] 任洁 

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]中国水电顾问集团中南勘测设计研究院,长沙410014 [3]河北省石津灌区管理局,石家庄050051

出　　处：《应用力学学报》2016年第1期110-115,185,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51309190);国家教育部博士点基金(20126118120015);陕西省重点学科建设专项资金资助项目(106-00X9030);中国博士后科学基金(2014M552470)

摘　　要：基于邓肯-张E-B非线性模型,对某沥青混凝土心墙堆石坝进行三维有限元分析,研究该坝在竣工期及蓄水期坝体与心墙的应力变形特性,得到不同时期坝体、心墙的应力、变形分布规律。结果表明:竣工期及蓄水期坝体最大沉降值出现在约1/2坝高处;坝体沿水平位移方向上游部分呈现向上游变位的趋势,坝体下游部分呈现向下游变位的趋势;坝体大、小主应力随深度的增加而增加;心墙的最大沉降值出现在大约1/2墙高处;心墙沿坝轴线位移左右岸分别产生向河床中部的位移;心墙大、小主应力随深度的增加而增加,心墙基本全部受压,仅在左右岸与基座接触处出现小范围的拉应力区;蓄水期心墙在任意高程处的竖向应力均大于同点的上游水压力,故心墙发生水力劈裂的可能性很小。建议设计时应在上下游坝坡采取必要的护坡措施,施工时保证上下游坝坡附近坝体的压实质量;由于左岸岸坡太陡,与混凝土垫座相接的部位出现较大的拉应力,应进行相应的开挖处理。Based on Duncan-Chang E-B non-linear model, a three-dimensional finite element analysis method is adopted to analyze a rockfill dam with asphaltic concrete core wall, to study the characteristics of stress and deformation of the dam body and core wall during its completion and storage period, and the laws of stress and deformation of the dam body and core wall in different periods are obtained. The results show that: the largest settlement of the dam body is about at its 1/2 height; the horizontal displacement of upstream portion trends to the upstream, while the downstream part trends to the downstream; the major and minor principal stresses of dam increase with increasing depth. The maximum settlement value of core wall is at about 1/2 the wall height; the displacement along the dam axis of left, right bank both displaced to the middle; the major and minor principal stress of core wall also increase with increasing depth, almost all of the core wall are under pressure, only on the contact parts of left or right bank of core wall with foundation bed a small range of tensile stress zone appears. In impoundment periods, the vertical stress of core wall is greater than upstream water pressure at the same point at any height of the core wall, so the possibility of hydraulic fracturing is small. It is recommended that the slope protection measures should be taken on the slope of both upstream and downstream, the compaction quality of slope must be guaranteed when being constructed; because of the left bank slope is too steep, a relative large tensile stress occurs in the contact area with the concrete block, so a corresponding excavation is necessary.

关 键 词：沥青混凝土心墙 堆石坝 应力变形 有限元分析 

分 类 号：TV641.4[水利工程—水利水电工程]