通过长江科学院研制的大型叠环单剪仪，进行了基于同厚度不同含水率泥皮对接触面力学特性影响的相关试验研究。试验结果表明：泥皮含水率的变化引起夹泥皮接触面剪切应力-剪切位移关系曲线形式的改变。当泥皮含水率较低时，其剪应力与相对剪切位移呈现出较好的双曲线关系；当泥皮含水率较高时，接触面剪切破坏阶段后切向变形表现出明显的刚塑性变形特征。泥皮含水率的变化对接触面抗剪强度及法向应力线性关系影响不大，两者仍保持很好的线性关系。泥皮含水率对法向位移及接触面摩擦角都有一定影响，随着泥皮含水率的增加，法向位移增大，接触面摩擦角减小。

In this paper, a series of mechanical experiments of interface with slurry containing the different capacities of water between the gravel and the concrete are conducted by the monotonic shear apparatus invented by Yangtze River Scientific Research Institute. It is confirmed that the change of water capacity of the slurry will cause that of the curves of shear stress and shear displacement of the interface. When the water capacity of the slurry is small, the relation of shear stress and displacement of the interface is closed to that of the Clough - Duncan hyperbola; in contrast, the relation of shear stress and shear displacement of the interface is closed to that of the characteristics of the rigid plastic shear deformation, which can be analyzed by the rigid - plastic model of Ying Zongze; the water capacity of the slurry has a little affect on the relation of strength and v - stress of the interface, which is still the linear relation. But the big water capacity of the slurry can make the v - displacement bigger and the φ of the interface smaller.