高寒地区沥青混凝土心墙坝有限元数值分析  

Finite element numerical analysis of asphalt concrete core dam in high cold area

作　　者：孟佳[1] 江浩源 孙新建[1] 曾蜜蜜 

机构地区：[1]青海大学水利电力学院,青海西宁810016

出　　处：《青海大学学报（自然科学版）》2017年第6期41-48,共8页Journal of Qinghai University(Natural Science)

摘　　要：为优化设计和指导施工,基于邓肯张E—B非线性弹性本构模型,采用三维非线性有限元法建立坐落于青藏高寒地区的某沥青混凝土心墙堆石坝的实际地质地形模型,研究分析竣工期和正常蓄水位期,坝体堆石体与沥青混凝土心墙的应力变形特性,讨论温度变化对沥青混凝土心墙工作性能的影响。结果表明:两种工况下,大坝堆石体位移等值线的分布规律基本相似,蓄水期上游堆石体受水浮力的作用位移相对于施工期有减小的趋势,而下游堆石体位移则有增大的趋势;堆石体应力分布规律也比较规则,从坝基至坝顶呈现出逐渐增大的趋势,基本全受压;寒区温度变化对本工程沥青混凝土心墙的工作性能影响较小。研究成果为相关工程的设计、施工及稳定安全运行提供参考。To optimize the design and guide the construction, based on the Duncan Chang E-B non -linear - elastic constitutive model, the three - dimensional nonlinear finite element method is used to establish the actual geological topography model of a asphalt concrete core rockfill dam located in the alpine region of Qinghai - Tibet. At the completion and the normal water level period, the stress and deformation characteristics of the rockfill body of the dam and the asphalt concrete core wall were studied. The influence of the temperature change on the work performance of the asphalt con-crete core wall was analyzed. The results show that the distributions of the displacement contours of the rockfill body of the dam are basically similar in both cases. At the storage stage, a decreasing trend in the maximum displacement of the upstream rockfill body can be seen compared with the construction period, while the maximum displacement of the downstream rockfill body has an in-creasing trend. The distribution of stress is also more regular, which shows a trend of increasing gradually from the dam foundation to the crest. The total rockfill body basically is under pressure. The change of temperatures poses a small impact on the work of the asphalt concrete core wall work performance in cold area. The results of this paper provide a reference for the design, construction and stable and safe operation of related reference.

关 键 词：高寒地区 沥青混凝土心墙 温度 应力变形 有限元分析 

分 类 号：TV641.41[水利工程—水利水电工程]