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Abstract In mesoscopic level，the soil-rock mixture is treated as a two-phase composite of rock and soil in two dimensional case. Convex polygons are used to represent the rocks and empty space the soil contents. The convex polygons are randomly scattered in simulated region in the numerical simulation. A rhombus was randomly generated and was randomly transformed into a convex polygon according to the parametric expression of rhombus. The convex polygons of different sizes are randomly assigned into the area of simulation in accordance with a certain distribution functions until the terminating conditions are satisfied. If the distances between a newly generated convex polygon and other polygons the generated previously are not zero；the new generated convex polygon is then adjusted accordingly to simulate the real physical condition of the soil-rock mixture. As such，a soil-rock mixture with the rock content of 72.01% in terms of area ratio is generated within the square of 30 cm in length；and the particle diameter is in the range of 1–8 cm. Finite element mesh of the soil-rock mixture is generated；and a numerical analysis is carried out to simulate a mechanical loading test. The stress concentrations on the interfaces between soil contents and rock particles are observed from the simulated results stress nephograms，which agreed with those in real situations.
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Received: 05 August 2013
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2014, Vol. 33 
