【作者】 周明军；

【导师】 张建海；

【作者基本信息】 四川大学 ， 岩土工程， 2006， 硕士

【摘要】 拱坝坝基和坝肩的稳定性问题历来都是设计和地质专家十分关注和重视的问题。溪洛渡高拱坝坝区构造为一套发育于岩流层层间和层内的错动带如C₁、C₂、C₃、C₃、C₇、C₈、C₉、C₁₀、C₁₁、C₁₂和P₂β_n、L_c等及4组比较发育的节理裂隙系统，其物理力学性质参数低，抗变形能力弱，从而对坝肩（基）岩体整体稳定性产生显著影响。本文在细致模拟坝址区层间层内错动带空间展布和连通特征基础上，采用三维非线性有限元及刚体弹簧元法，对溪洛渡高拱坝坝肩静动力稳定性进行研究：定量分析了层间层内错动带的变形和超载破坏规律；确定了坝肩岩体的超载及综合安全系数、破坏形态和破坏机理；计算了坝肩典型滑动块体在地震作用下的动力抗滑安全系数并分析了坝肩岩体整体抗滑稳定性，从而总体评价工程安全性。主要研究内容如下： 1．根据溪洛渡坝址区的地形地质条件，充分模拟了坝肩岩体层间层内错动带及岩体裂隙分布，较为真实地建立了坝体、坝基及坝肩整体计算模型。 2．采用非线性有限元方法，分析了层间层内错动带变形及破坏规律和坝基岩体可能破坏区域及破坏机理，确定了岩体点安全度、超载系数和综合安全系数，综合评价了静力荷载作用条件下的坝肩稳定性。 3．采用刚体弹簧元法，结合溪洛渡坝址条件选择三种地震波输入，计算坝肩典型滑移块体的地震惯性力和动力抗滑安全系数，分析评价了坝肩动力抗滑稳定性。 4．基于水荷载与坝高的关系推求得到拱端推力理论求解公式，并得到：拱端推力顺河向分量与坝高成三次方关系；横河向分量与坝高成四次方关系。更多还原

【Abstract】 The stability of arch dam foundation and abutment is always of great concern to designer and geological experts. The site formation of Xi Luodu high arch dam are a serial of layered and inner dislocation bands and four groups joint fissures, such as C₁ C₂ C₃ C₅ C₇ C₈ C₉ C₁₀ C₁₁ C₁₂ and P₂ β_n L_c etc,which the physical mechanic parameters are small and the deformability is weak.So they are the most noticeable to the whole rock mass stability of the dam abutment. In this thesis, the static and dynamic stability of dam abutment are studied using 3D non-linear finite element method and 3D RBSM（Rigid Body-spring model）, based on delicate and careful simulation of layered and inner dislocation bands of the dam area: studied the deformation and over-load failure mechanism quantitively;confirmed the over-load and synthetic safety coefficient and the failure conformation and mechanism; calculated the dynamic safety coefficient of the gliding-body and analysed the whole stability of the abutment under the earthquake conditions; evaluated the security of the project. The main research contents are as follows:1. According to the geological conditiongs of Xi Luodu project,layered and inner dislocation bands and joint fissures are fully simulated to establish 3D numerical modal of the arch dam, foundation and abutment.2. Using 3D non-linear finite element method, studied the deformation and over-load failure mechanism of layered and inner dislocation bands and the failure area and mechanism of rock mass,and confirmed the degree of spot safety and the over-load coefficient and the synthetic coefficient,and evaluated the stability of dam abutment under the static load conditions.3. Using 3D RBSM and combined with three seismic waves in the location of更多还原