Abstract
The behavior of interfaces between coarse-grained soil and gravel-clay introduced by earthquake plays an important role in analyzing the stability of the impermeable structure in rock filling dams. Using the NGI-type simple shear apparatus, cyclic simple shear tests were performed to study the mechanical behaviors of the interface; shear deformations both along the interface and in the coarse-grained soil were analyzed. The test results indicate that: the cyclic shear strength of the interface was found approximately linearly proportional to the normal stress applied on the interface; meanwhile, the shear deformations reached their peak values in the first cycle, respectively; and the direction of initial shear stress significantly influenced the mode of relative displacement along the interface. In addition, shear shrinkage and shear dilation occurred alternately in each cycle. It also revealed that shear strength of the interface increases as the shear cycle increased and is approximately linear proportional to the normal stress level on the interface.
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