深覆盖层闸坝结构特性及基础处理措施研究

坝基处理措施及坝体结构特性是深覆盖层上修建闸坝的关键技术问题。以大渡河沙湾水电站为研究背景，利用ANSYS大型有限元分析软件，采用非线性有限元法，根据基础处理时清挖深度以及回填料的不同，分三种地基处理方案进行了计算，研究不同方案下闸坝坝体结构及坝基在完建工况、正常运行工况以及校核洪水位工况的受力特性和应力分布规律，通过对比分析坝体不均匀沉降、应力特征以及坝基承载力，处理方案三的闸室不均匀沉降最小，坝体和坝基特征部位的应力集中程度最弱，受力特性良好，而且满足坝基承载力要求，优化了闸基与纵向防渗墙的接触模式，因此选择此方案为本工程基础处理的推荐方案，为工程实际提供了重要参考。

Research on Dam Structure Characteristics and Foundation Treatment Measures for Gate Dams on Deep Overburden Layers

It is one of key technologies to study foundation treatment and structural characteristics of gate dam on overburden layer. Taking Shawan hydropower station in Dadu River for example, Based on the large finite element analysis software ANSYS and according to the different clear cut depth and different back to packing in foundation treatment ，the nonlinear Finite Element Method is used to study dam structure characteristics and stress distribution law in the construction condition, normal operation condition and check flood level condition, by comparatively analyzing differential settlement, stress characteristics and Dam foundation bearing capacity，the lock chamber uneven settlement of scheme three is minimum, the dam body and dam foundation characteristic parts of the stress concentration degree is the most weak, mechanical characteristics is good, but also meeting the requirements of the dam foundation bearing capacity and optimizing contact mode between foundation and vertical impervious wall and choosing this plan as the recommended scheme of the engineering foundation treatment，Finally,important references is provided to actual project.