特高混凝土面板堆石坝的应力变形比较研究  

Comparative Study on Stress and Deformation of Super-high Face Rockfill Dam

作　　者：陈平 朱家奇 王庆祥 CHEN Ping;ZHU Jiaqi;WANG Qingxiang(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,Hunan,China;College of Water-conservancy and Hydropower,Hohai University,Nanjing 210024,Jiangsu,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [2]河海大学水利水电学院,江苏南京210024

出　　处：《水力发电》2022年第6期90-95,104,共7页Water Power

摘　　要：结合金沙江拉哇特高混凝土面板堆石坝,分别采用邓肯E-B模型和河海统一广义塑性模型,考虑堆石料流变的遗传特性,进行大坝三维有限元分析,并在坝料相同试验结果的条件下对比研究两种不同本构模型下堆石体和面板应力变形的差异。结果表明:两种模型计算的堆石体应力变形规律相似,沉降差异不大,但河海统一广义塑性模型计算的堆石体水平位移及面板挠度均小于邓肯E-B模型;混凝土面板的位移分布差别较大,由于邓肯E-B模型不能考虑堆石料的剪胀性,计算满蓄期面板的变形远大于统一广义塑性模型结果;两种模型在满蓄期计算得到的应力较为接近,与统一广义塑性模型相比,邓肯E-B模型计算得到的堆石体第三主应力较小,面板压应力数值偏大,拉应力区域较大。不同本构模型的计算结果均说明拉哇特高混凝土面板堆石坝的变形与应力在安全范围内,现行设计方案可行。In combination with Lawa super-high concrete face rockfill dam in Jinsha River,the Duncan E-B model and the unified generalized plastic model are used to carry out the three-dimensional finite element calculation of the dam respectively considering the genetic properties of rockfill rheology.Under the condition of same dam material test results,the differences of stress and deformation of rockfill body and face slab under two different constitutive models are compared and studied.The results show that:(a)the stress and deformation laws of rockfill body calculated by the two models are similar,and there is little difference in settlement,while both the horizontal displacement of rockfill body and the deflection of face slab calculated by the generalized plastic model are smaller than those calculated by Duncan E-B model;(b)the displacement distribution of face slab calculated by the two models is quite different,and since the Duncan E-B model cannot take into account the dilatancy of rockfill,the deformation of face slab during full reservoir storage period is much larger than that of the unified generalized plastic model;and(c)the stresses calculated by the two models during the full reservoir storage period is relatively close,and compared with the generalized plastic model,the third principal stress of rockfill body calculated by Duncan E-B model is smaller,and the compressive stress and the tensile stress area of face slab is larger.The calculation results of two models all indicate that the deformation and stress of Lawa super-high concrete face rockfill dam are within the safe range,and current design scheme is feasible.

关 键 词：特高混凝土面板堆石坝 有限元 本构模型 应力变形 比较研究 

分 类 号：TV641.43[水利工程—水利水电工程]