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Abstract The mesostructure characteristics significantly affect meso-failure evolution mechanism and the macro- mechanical characteristics of soil-rock mixture(S-RM) under external forces. It is very important for the improvement of theoretical system of S-RM mechanics to study the mesostructural mechanics of S-RM based on its mesostructural characteristics. Accordingly，the statistics，geometry，random simulation techniques，etc. are used，and the random mesostructure generation system of S-RM based on arbitrary polygonal and elliptic rock blocks(R-SRM2D) has been developed. Based on R-SRM2D，a series of random S-RM samples with different rock block contents，granularity compositions，rock block spatial distributions and soil-rock interfaces are generated，which is used to study the relationship between mesostructure difference and meso-failure mechanics or macro- mechanical characteristics of S-RM by numerical test. Meaningful results have been obtained theoretically. It is indicated that with the increment of rock block content，the elastic modulus and uniaxial compressive strength of S-RM increase；at a certain rock block content，the macro-strength of S-RM decreases with the increment of rock block fractal dimension；the compressive strength of S-RM reaches maximum value when the longer axis of rock blocks is perpendicular or parallel to the principal stress axis；when the angle between the longer axis of rock blocks and the principal stress axis is equal to (45°－φs/2)，the compressive strength of S-RM reaches minimum value；the cementation action of soil-rock interface makes the macro-strength of S-RM increases obviously，whose uniaxial compressive strength increases nearly twice.
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Received: 26 December 2008
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