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Abstract The interaction between soil and structure is a significant mechanical problem with widespread in geotechnical engineering. This paper introduces the development of shear testing device with interface visualization for soil-structure interaction and its application. On the basis of an existing large-scale direct shear test system，the locally perspective rigid shear boxes and data acquisition and analysis system are designed，and relevant devices are developed. Besides the obtainment of mechanical parameters of soil-structure interface，during the process of shear tests，a series of images of the shear band on the interface are captured by digital camera in real time；the thickness of the shear band and the deformation of the soil particles and gravels at the shear band are obtained by images analysis using GeoPIV software. Based on real geological condition of an accumulative landslide in the Three Gorges reservoir area，a series of shear tests of soil-concrete interface are conducted under different water contents. The change law of shear strength parameters and the characteristics of particles movement are obtained during shear tests；the displacement and its change rules of soil particles and gravels are quantitatively analyzed. The testing results indicate that the thickness of the shear band under the circumstance described in this paper is 17–23 mm；there is obvious deformation of soil and gravels in the upper shear box；the horizontal displacement of soil and gravels is less than the relative displacement of shear boxes. The relationship between shear stress and real displacement of soil and gravels is given as well. The research results will not only contribute to shear test of soil-structure interaction，but also provide vital supports for the study of mechanical behavior and constitutive model of interface between soil and structure.
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Received: 27 July 2011
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2012, Vol. 31 
