碾压混凝土拱坝三维弹塑性有限元分析

在建立碾压混凝土拱坝等效连续概化模型的基础上 ,采用压扁单元和等效连续概化模型相结合来模拟碾压混凝土坝体的方法 ,运用四参数、Mohr- Coulumb和 Drucker- Parger准则分别模拟坝体、层面和基岩 ,以及用分散式裂缝模型模拟坝体开裂状态。对沙牌碾压混凝土拱坝进行的三维弹塑性有限元分析表明 ,坝肩出现了非层面向的裂缝并危及帷幕灌浆体 ,不利于拱坝正常运行。

3-D elastic-plastic FEM analysis of RCC arch dam

Based on the structural feature of roller compacted concrete dam, 3 D elastic plastic finite element method (FEM) analysis of roller compacted concrete (RCC) arch dam is carried out, the equivalent deformation model and equivalent elastic matrix are developed. The method using pressured dam element at key bedding joint and dam element at other dam body is proposed to model RCC dam. Based on smeared cracking model, four parameter criterion, Mohr Coulumb criterion and Drucker Prager criterion are used to simulate nonlinear feature of dam body, bedding joint and foundation. At last, the nonlinear FEM analysis of Shapai RCC Arch Dam is presented.