Can interface elements be added between two layers of the same soil having the same properties. The top layer is moving while the bottom one is stable just like the direct shear test.
yes you can do it, this method is used to measure the shear flow between the two layers, but you have to adjust the shear strength of the interface to match the soil shear strength to eliminate the effect of the interface element on the lateral deformation of the model.
Thanks for your answer. So what is the point if the strength parameters of the soil and interface were the same? Do you think that these parameters should be reduced to allow sliding of the upper layer?
if you reduced the shear stiffness of the interface, the sliding will occur on the interface level at lower shearing force than without the interface
It's possible, however, if you don't reduce shear strength of interface, there is no difference between a layer of soil and two layers of same soil having an interface between. By the way, you should not use an interface with reduced strength in a direct shear test.
Do you think that the residual strength should be used instead of the peak strength?
it depends on your software, .. for example, if you are using advanced software like ANSYS you can define the (stress - strain ) relation of the interface exactly as the experiment. But if you are using commercial software like PLAXIS then you have to define constant value for the interface stiffness, in this case the chosen value depends on model purpose, if you interest in ultimate shearing capacity, then use the peak value, on other hand if you interest in deformations you may use the residual value.
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