Three-dimensional DEM modelling of isotropic compression of cemented sand

抄録

Isotropic compression tests were carried out on virtual cemented specimens with different values of cement content and initial void ratio by using three-dimensional (3-D) distinct element method (DEM), and the effect of cementation on cemented sands was examined. First, a simple 3-D bond contact model was introduced to represent the existence of inter-particle cementation. Second, a series of isotropic compression tests were conducted. Finally, the macro and micro-mechanical responses of cemented sands during loading were discussed. The results show that both cement content and density influence the compression curve of the cemented material. The macroscopic yielding is associated with bond breakage on microscopic scale. Bond breakage is primarily due to tension-shear and compression-shear failure, and occurs mainly in the strong contact force network. In addition, the bonded-contact orientation does not vary with compression pressure and cement content.