考虑覆盖层应力历史的土石坝变形分析  

Strain Analysis of Earth Dam Considering Stress History of Overburden Layer

作　　者：薛建荣[1,2] 代凌辉[1] 乔景顺[3] 

机构地区：[1]黄河水利职业技术学院,河南开封475001 [2]清华大学水利系,北京100084 [3]黄淮学院,河南驻马店463000

出　　处：《人民黄河》2014年第4期99-101,共3页Yellow River

基　　金：河南省教育厅青年骨干教师资助计划项目(2009GGJS-131);黄淮学院校级研究项目(2012XJGLX0204)

摘　　要：介绍了应力历史对坝体变形的影响和邓肯张本构模型中卸荷的判别标准。在考虑覆盖层应力历史的条件下,把坝基覆盖层各单元的应力和历史最大偏应力、历史最大应力水平以及历史最大固结压力作为大坝填筑前有限元分析计算的初始条件,计算坝体的变形。考虑坝基覆盖层应力历史和不考虑坝基覆盖层应力历史两种情况下的计算结果表明:当考虑坝基覆盖层应力历史时,坝体变形明显偏小,并且最大位移值发生位置明显靠向坝体上部,证明坝基覆盖层应力历史对土石坝变形有重要影响。In this paper, the influence of stress history to the strain and the criterion of unloading of Duncan-Chang model were introduced. The el- ement stress and the biggest dcviatoric stress, stress level and consolidation pressure were picked up as the calculation＇ s initial conditions consider- ing the stress history of overburden layer. The results were compared with the same model without considering stress history. It shows that the dam＇ s strain is reduced obviously when considering stress history of overburden layer, and the position of the maximum points rise greatly. So the stress history of overburden layer is very important to the deformation of earth dam.

关 键 词：土石坝 覆盖层 应力历史 初始地应力 

分 类 号：TV641.4[水利工程—水利水电工程]