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Soil-rock mixtures (SRM) is a special geomaterical which is composed of soil and rock blocks.Owning to its natural characteristics of inhomogeneity and discontinuity, there are still many difficulties about understanding mechanical properties of the SRM material.This paper presents a particle-scale investigation of geomechanical behavior of the SRM material by the discrete element method (DEM).A series of numerical triaxial compression tests are carried out to study the influence of different ratios of rock block in SRM on the stress-strain behavior, the volumetric response and on the macroscopic properties such as friction angle and dilation angle.It is shown that the ratio of rock block content in SRM significantly affects shear strength and dilation response of the SRM material.The effect of void ratio on geo-mcchanical behavior of the SRM material is also studied using a newly introduced concept of equivalent skeleton void ratio.Furthermore, an attempt is made to reveal the mechanism of geo-mechanical behavior of the SRM material in particle scale.