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| STUDY OF MESOSCOPIC FRACTAL FEATURE AND MECHANICAL PROPERTIES FOR ROCK AND SOIL AGGREGATES SAMPLES |
| WANG Yu1，2，LI Xiao1 |
| (1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Science，Beijing 100029，China；2. University of Chinese Academy of Sciences，Beijing 100049，China) |
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Abstract Rock and soil aggregates(RSA) has the properties of strong heterogeneity，heterogeneity，discontinuity and environment dependent. Based on the nonlinear property of RSA，the mesoscopic structure characteristics of RSA was analyzed by fractal geometry theory. Remodeling process of RSA samples was explicated，stress-strain relationship under uniaxial compression test and characteristic strength value of RSA samples were mainly discussed. Results show that：(1) As an important index to mechanical characteristics for RSA，stone content is closely associated with RSA granularity fractal dimension and meeting power function relationship. (2) According to uniaxial compression test，the pre-peak stress-strain curve of RSA is divided into four parts：contact consolidation stage，elastic stage，crack stable propagation stage and crack unstable propagation stage. (3) With the increase of stone content，uniaxial compressive strength reaches to maximum when stone content is 50%，axial strain is increasing with stone content，the radial deformation of earth-rock aggregate is more sensitive；(4) Analogy the mechanical properties of brittle rock and concrete，cracking initiation stress of soil-rock TB crack is predicted and stress value is calculated using LSR method，relationship of crack initiation stress，volume dilatation stress and peak stress are analyzed. The mesoscopic structure of RSA has hierarchy and similarity. Fractal geometry theory is a good method to study mesoscopic mechanics characteristics of RSA，which provides theoretical inference to study the mesoscopic structure and mechanical property for RSA.
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2015, Vol. 34 
