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中文摘要：
基于数码成像原理分析，利用土石混合体中块石与土体颜色属性的巨大差异，提出基于数码图像的土石混合体结构模型自动生成方法，并开发相应程序，以最直接、快捷、准确地反映土石混合体的空间结构。在此基础上，利用有限元数值模拟技术分析土石混合体的力学结构效应，也即在单轴压缩条件下土石混合体的高非均匀与非均质引起其应力场的结构效应非常显著，试样内应力的分布基本受块石的分布与形状控制。研究结果可为工程提供一定的参考。
英文摘要：
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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