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| STRUCTURE MODEL CONSTRUCTION OF ROCK AND SOIL AGGREGATE BASED ON DIGITAL IMAGE TECHNOLOGY AND ITS NUMERICAL SIMULATION ON MECHANICAL STRUCTURE EFFECTS |
| LIAO Qiulin1，2，LI Xiao1，ZHU Wancheng3，LIU Jishan4 |
(1. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. Beijing Urban Construction Group Co.，Ltd.，Beijing 100088，China；3. Northeastern University，Shenyang，Liaoning 110006，China；4. University of Western Australia，Perth 6009，Australia)
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Abstract Digital image which describes the material by lattice data provides a good base to build the structure model of rock and soil aggregate(RSA) accurately. Based on the analysis of the digital imaging theory，the color contrast between rock and soil in RSA is analyzed. An auto-generating method of RSA structure model is proposed based on digital image to express spatial structure of RSA directly，quickly and accurately. Firstly，the differences of colors between roils and rock blocks are transferred into digital mode，and each pixel in the image of RSA is described by a digital eigenvalue. Then，the threshold for the digital eigenvalue that can represent rock block pixel is obtained by comparing RGB values or HIS values of RSA images. So each pixel is set different material properties according to the threshold；and the numerical structure of RSA is constructed. Besides，the numerical simulation of the structure model of RSA is carried out. It is shown that the nonuniform of rock distribution of RSA will cause an obvious mechanical structure effect on RSA under uniaxial compression.
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Received: 22 February 2009
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