Abstract：In order to explore the meso-mechanisms of influence of rock block shape on mechanical properties of cemented soil-rock mixture (SRM), Spherical, cubic and cuboid-shaped rock blocks are taken into consideration. SRM with cubic rock blocks are compared with that with spherical rock blocks to explore the influence of block angularity. SRM with cuboid-shaped rock blocks are compared with that with cubic rock blocks to explore the influence of block sphericity. Firstly, numerical models of cubic and cuboid-shaped rock blocks are constructed based on a 3-D DEM refined modeling technology for irregularly shaped particles. Then, 3-D DEM stochastic models of cemented SRM with 30% and 80% rock block proportion (RBP) are established, whose block shape is spherical, cubic and cuboid-shaped respectively. Then, a particle flow simulation of large scale triaxial tests of SRM is conducted to obtain strength and deformation characteristics of SRM with different rock block shape and RBP. Finally, Meso-mechanisms of influence of rock block shape on mechanical properties of cemented SRM with low and high RBP is intensively analyzed. The results show that RBP and rock block shape both significantly affect the mechanical behaviors of SRM and there is complicated interaction of the two factors. The evolution of micro-crack, mean rotation of rock blocks, strain energy and frictional work can well reflect the meso-mechanisms of influence of rock block shape.
2015, Vol. 36 
