折线形胶凝砂砾石坝三维静力有限元分析

Three-dimensional static finite element analysis of folded-line cementitious sand gravel dam

以贵州地区某中型水库工程胶凝砂砾坝方案为案例,建立折线形胶凝砂砾石坝及地基的三维有限元计算模型,模型中考虑地基和坝体材料的非线性特性、坝段间接触特性、地应力平衡等。基于ABAQUS三维有限元计算,研究该方案蓄水工况和施工期工况下建坝引起的地基应力变化及各坝段的变形情况,为该项目方案决策提供理论依据。经计算分析,断层破碎带和影响带附近的地基应力及坝体变形均较大,不能满足地基承载力要求和坝段变形控制要求,需提出工程处理措施或其他技术方案进行优化。该有限元计算结果对类似工程如折线形刚性坝、胶凝砂砾石坝以及宽断层破碎带筑坝具有一定的借鉴意义。

Taking the project of a medium-sized reservoir project in Guizhou province as an example,a three-dimensional finite element calculation model of a broken line cement-gravel dam and its foundation was established.The nonlinear characteristics of the foundation and dam material,the contact characteristics between the dam sections and the in-situ stress balance were considered in the model.Based on ABAQUS three-dimensional finite element calculation,the change of foundation stress and the deformation of dam section caused by dam construction under the condition of water storage and construction period are studied,which provides a theoretical basis for the project decision.According to the calculation and analysis,the foundation stress and dam deformation near the fault fracture zone and the influence zone are large,which can not meet the requirements of foundation bearing capacity and dam section deformation control.It is necessary to propose engineering treatment measures or other technical schemes for optimization.The finite element calculation results can be used for reference in similar projects such as the construction of curved rigid dam,cementified sand gravel dam and wide fault fracture zone.