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Abstract The basic process of digital image processing technique is described firstly. Based on the technique，a program is designed to directly set up particle flow model from digital image，which provides a new modeling method for particle flow simulation about mechanical behaviors of soil and rock mixtures(SRM). Then，using the proposed modeling method，a series of biaxial tests are simulated by the particle flow code in 2 dimensions(PFC2D). After that，the results of these biaxial tests for SRM are compared with those of homogeneous soils. The results show that the stress-strain curve of SRM has a feature of stepwise；and the differential value between principal stresses at the first step basically corresponds to the yield strength of soil；and the strength increase is due to strain hardening phenomenon caused by gravel，which is consistent with the field test result. Finally，the failure mode of SRM is studied；and the results show that there is a great difference comparing to that of homogeneous soils；and the failure zone is irregular for SRM；but when the homogeneous soil fails，there exists a banded shear zone.
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Received: 10 August 2009
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