Research on the Effect of Micro Particle Shape of Marble Using Clump Parallel-Bond Models

The deformation and failure characteristics of brittle-ductile-plastic transition, which is shown in the post-peak stage for Jinping deep marble. Using boned-particle model (BPM) to simulate the marble could not show this property. Therefore, it is simulated by clumped-particle model (CPM) to studied from the micro view of the particle flow code (PFC). In the PFC version 5.0, the different shape of particle can be created by the clump templates, it could be templates which combined with the single or multiple particles, and it could be also mixed ball and clump to generate different rock model. In this paper, different clump ratio, different clump components, different clump components position are considered. And then models were applying the uniaxial compression test to research macroscopic mechanical properties of the synthetic rock. The related numerical results have demonstrated that: (1) The effect of particle shape on the rock is very significant, especially in the case of high confining stress. (2) clump template is very important for changing the mechanical behavior of the model. The ratio of the clump is higher, the larger the number of clump particles in the model is, the greater the strength of the model will be. For different clump template, the more closely linked of the pebble is, the greater strange of the model will be. For the same number of the pebble, the larger intersection area is, the greater the “lock-in” effect, the stronger the whole model will be.