The microscopic mechanism associated with mechanical behaviour of sandstone: Using a bonded particle model
Journal
Proceedings of the 12th International Conference on Civil, Structural and Environmental Engineering Computing
ISBN (of the container)
9781905088300
Date Issued
2009
Author(s)
Li, H.H.
Abstract
According to the previous researches of sandstone, it was found that the key microscopic parameters influencing unconfined compressive strength (UCS) are porosity and grain area ratio (GAR). However, the relation of macroscopic properties with the microscopic ones highlights necessities further study in exploring how the microscopic properties influence the macroscopic properties. In this study, numerical analyses based on the bonded particle model were conducted to systematically study the microscopic mechanism. The model is firstly verified by simulating the variation of UCS with different GAR and porosity n. Furthermore, the elasto-plastic deformation of sandstone is explored by means of CTC tests. Analysis results demonstrate the mechanical behaviour of sandstone has the following characteristics: (1) The greater GAR and porosity will lead to the less cohesion, and the higher porosity leads to the lower friction angle; (2) The elastic shear modulus increases with decreasing porosity and increasing GAR; (3) A series of elliptic plastic potential surfaces can be observed; and (4) The variations of plastic angle and plastic strain trajectory under different shear stress are similar to actual behaviours of sandstone. © Civil-Comp Press, 2009.
Event(s)
12th International Conference on Civil, Structural and Environmental Engineering Computing, CC 2009
Subjects
Bonded particle model
Elasto-plastic deformation
Sandstone
Description
12th International Conference on Civil, Structural and Environmental Engineering Computing, CC 2009, 1 September 2009 through 4 September 2009, Funchal, Madeira
Type
conference paper