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| TEST INVESTIGATION ON MECHANICAL BEHAVIOR OF SPHERICAL GRANULAR MEDIA-STEEL PLATE INTERFACE |
| FENG Dakuo1，2，ZHANG Jianmin1，2 |
(1. State Key Laboratory of Hydroscience and Engineering，Tsinghua University，Beijing 100084，China；
2. Institute of Geotechnical Engineering，Tsinghua University，Beijing 100084，China) |
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Abstract Applied with self-developed three-dimensional interface test apparatus，three-dimensional monotonic and cyclic shear mechanical behaviors of ideal spherical granular media-steel plate interface are investigated，which is direct proof and of great significance to its numerical simulation using discrete element method. The test results indicate that the mechanical behavior of ideal interface is very different from that of actual coarse grained soil-structure interface. Ideal interface also presents obvious shear volumetric change，which can be divided into irreversible and reversible components during cyclic shearing. The irreversible component is mainly yielded by particle rearrangement and void reduction. The reversible component is induced by particle climbing or even rolling；and shear path has an obvious influence on reversible component. The hardening behavior of ideal interface due to cyclic shear application is not so apparent as actual gravel-structure interface for little particle crushing. The shear stress-shear displacement relation curves present obvious nonlinearity and the curve patterns are also influenced by shear path. The relationship between shear strength and normal stress of interface can be described with Mohr-Coulomb criterion，in which the friction angle of the interface ?i is approximately 20.2°，which is smaller than internal friction angle of granular media. Shear path has a notable influence on cyclic history curve patterns of principal shear stress ratio of ideal interface，while it has a little influence on peak value of principal shear stress ratio.
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Received: 04 March 2010
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2011, Vol. 30 
