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| STRUCTURE EFFECT STUDY OF DEFORMATION AND FAILURE OF ROCK AND SOIL AGGREGATE WITH CT TECHNIQUE |
| YUAN Weina1，2，LI Xiao1，HE Jianming1，LI Shouding1，CHENG Guowen3，LI Tengfei1，2 |
| (1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Guangdongguanyue Highway and Bridge Co.，Ltd.，Guangzhou，Guangdong 510635，China) |
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Abstract In order to study the structure effects，interior structural deformation of rock and soil aggregate(RSA) under uniaxial compression is studied through the X-ray computed tomography(CT) real-time scanning tests. Based on the scan orientation principle of CT，movement of rock fragments in RSA is analyzed. Moreover，the relationship between interior structural deformation and macroscopic deformation of RSA is studied. The results show that macroscopic deformation and failure of RSA are mainly caused by the position adjustment of interior rock fragments. It is also shown that the integral deformation of rock fragments in RSA can be represented by equivalent structure deformation. By using the method of image threshold segmentation，profiles of the sample are obtained and analyzed. The profiles indicate that interior damage and cracks of sample initiate from the contact zone between rock fragments and soil，and then extend around rock fragments，until they form fracture planes. The results can provide theoretical basis for the monitoring and warning of RSA slope.
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Received: 24 February 2012
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2013, Vol. 32 
