中文摘要：

泥土核心墙和具体的截止的墙的关节是在高土和 rockfill 水坝中的最弱的部分之一。一种高度塑料的泥土总是在关节上被修理适合大砍在泥土核心墙和具体的截止的墙之间的变丑因此在高度下面的关节上的流体力学的联合机制强调，高水力的坡度，并且大砍变丑为水坝安全的评估是很重要的。在一个高地球中的高度塑料的泥土和在中国的 rockfill 水坝的关节的流体力学的联合特征被使用一台最新设计的土壤结构接触侵蚀仪器学习。试验性的结果显示那：1 ) 砍关节上的失败由于应力和渗出物失败的流体力学的联合效果。渗出物失败将导致期末考试砍失败当到限制压力的 deviatoric 应力的比率在 1.01.2 以内时；2 ) 为关节的实验模型由最新定义的主要压力功能表示了的否定指数的渗透，考虑在渗透上限制压力和轴的压力的联合效果，基于流体力学的联合被建立实验。3 ) 在渗出物失败前后的解决的变化是很不同的。在渗出物失败前的解决很慢慢地变化，当它在渗出物失败以后显著地增加时。4 ) 压力紧张关系具有弄软类型的紧张。5 ) 沿着关节的流动仍然遵循 Darcian 流动统治。结果将在高地球和 rockfill 水坝的安全上为进一步的评估提供一个重要理论基础。

英文摘要：

The joint of clay core-wall and concrete cut-off wall is one of the weakest parts in high earth and rockftll dams.A kind of highly plastic clay is always fixed on the joint to fit the large shear deformation between clay core-wall and concrete cut-offwall,so the hydro-mechanical coupling mechanisms on the joint under high stress,high hydraulic gradient,and large shear deformation are of great importance for the evaluation of dam safety.The hydro-mechanical coupling characteristics of the joint of the highly plastic clay and the concrete cut-off wall in a high earth and rockfill dam in China were studied by using a newly designed soil-structure contact erosion apparatus.The experimental results indicate that：1） Shear failure on the joint is due to the hydro-mechanical coupling effect of stress and seepage failure.The seepage failure will induce the final shear failure when the ratio of deviatoric stress to confining pressure is within 1.0-1.2; 2） A negative exponential permeability empirical model for the joint denoted by a newly defined principal stress function,which considers the coupling effect of confining pressure and axial pressure on the permeability,is established based on hydro-mechanical coupling experiments.3） The variation of the settlement before and after seepage failure is very different.The settlement before seepage failure changes very slowly,while it increases significantly after the seepage failure.4） The stress-strain relationship is of a strain softening type.5） Flow along the joint still follows Darcian flow rule.The results will provide an important theoretical basis for the further evaluation on the safety of the high earth and rockfill dam.