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Abstract The simple shear tests are conducted to study the shear properties of silty clay-concrete interface by using the improved cyclic simple shear testing system. Three kinds of interface roughnesses，i.e. smooth，general and rough，respectively，and two kinds of soil specimen thicknesses(10，20 mm) are selected with normal pressure varying from 5 to 200 kPa to probe into the effects of these factors on the shear properties of interface. Test results show that the interface exhibits mainly two kinds of shear failure modes，i.e. shear failure in soil nearby the interface and sliding failure at the interface. The shear strength of interface is equal to the lower limit value of these two failure modes；and the stress-strain relationship of interface is accordingly determined by which of the two failure modes happens，although it tends to be the former mode with the increasing interface roughness and normal pressure. The tested stress-strain curves are affected by the thickness of soil specimen that adopted in tests，although this effect decreases rapidly with the increasing interface roughness and normal pressure.
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Received: 01 April 2011
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2011, Vol. 30 
