Original scientific paper
Meso numerical study on the failure mechanism of rock slope with bedding intermittent joints
Yu Zhou
Jinfei Chai
Guang Han
Abstract
Taking the Muliashi north open-pit mine in Zambia as a case study, the failure mechanism of rock slope with intermittent bedding joints was investigated from a meso mechanical viewpoint using particle flow theory and PFC2D software. In the rock slope model, the rock block and joint were represented by bonded-particle model and smooth-joint model, respectively. The main research results are as follows: (1) Due to orientation and discontinuities of joint, the sliding shape at the bottom of the sliding mass is relatively straight, while the tailing edge shape of sliding mass is flexural and is presenting step-path failure. (2) The fragmented particle assemblies of sliding mass are primarily generated in the middle and bottom part of slope. And they are subsequently generated in the top part of slope. The bulk of fragmented particle assemblies in the middle and bottom part are relatively larger than those in the top part. (3) At the end of sliding process, the contact force of particle is relatively larger along with the direction of rock bridge, and the effect of stress arch is generated around the primary joints. (4) During the sliding process of rock slope, the relationship between the magnitude and count of microseismic events obeys the normal distribution function approximately.
Keywords
rock slope; bedding intermittent joints; particle flow theory; PFC2D; meso research
Hrčak ID:
184816
URI
Publication date:
18.7.2017.
Visits: 809 *