|
Abstract Based on a series of microscopic mechanical tests on the bonded granules idealized by two glued aluminum rods，a microscopic bond contact model for rocks was proposed and implemented into a commercial distinct element code. The customized code was then used to simulate the uniaxial and biaxial compression tests，the direct tension test and the Brazilian test on rock. The numerical results were compared with available experimental data to verify the bond contact model. The results demonstrate that the distinct element method incorporated with the proposed model can capture the fundamental mechanical behaviors of rocks. The relationship curve between the bond broken number of bonds and the axial stress can be used to distinguish different stages of crack propagation and to predict the crack initiation stress，the crack damage stress and the peak stress.
|
|
Received: 21 May 2012
|
|
|
|
2013, Vol. 32 
