基于不同接触单元的面板堆石坝动力响应分析  

Dynamic Response Analysis of Rock Fill Dam with Face Slab Based on Different Contact Elements

作　　者：程玲 董景刚 

机构地区：[1]东北电力大学建筑工程学院,吉林吉林132012

出　　处：《人民黄河》2018年第1期82-84,91,共4页Yellow River

基　　金：东北电力大学博士科研启动基金资助项目(BSJXM-201422)

摘　　要：土工结构数值模拟中土与结构接触问题一直是学者研究的热点。通过改变普通四边形单元等效线性黏弹性动力本构模型中的动剪模量和模量指数,提出一种改进薄层接触单元,其与普通四边形单元本构模型一致,物理意义更为明确,模型计算参数更易取得,更适于土与结构接触面的计算。对坝高为200 m的面板堆石坝面板与垫层之间设置改进的薄层接触单元、不加接触单元、采用无厚度的Goodman单元及改变薄层接触单元动力参数等多种工况时,面板的动力响应结果分析比较表明:面板与垫层之间设置改进的薄层接触单元时面板的动力响应介于不设接触单元和设无厚度的Goodman单元之间,合理选取薄层接触单元动力参数可以得到理想的结果。Contact problem of soil and structure is a popular topic for numerical simulation of earthen structure. An improved thin layer contact element was proposed by changing dynamic shear modulus and index of module of linear viscoelasticity dynamic constitutive model based on general quadrilateral contact element. The proposed thin layer contact element,consisted with constitutive model of general quadrilateral contact element was suited for the simulation of rock fill dam with face slab because of the explicit physical interpretation and available calculating parameters. Dynamic response analyses were performed based on the proposed element,Goodman element as well as no contact element. Furthermore,different parameters of the proposed contact element were compared in the analysis of 200 m rock fill dam with face slab.The results show that the dynamic response of the dam,used the proposed contact element is larger than the results based on Goodman element,and smaller than the results of rock fill dam with face slab without contact element. Moreover,the more reasonable results can be obtained by selecting more reasonable parameters of thin layer contact elements.

关 键 词：Goodman单元 改进薄层单元 动力响应 接触面 面板堆石坝 

分 类 号：TV641.43[水利工程—水利水电工程]