关键词: 颗粒流方法, 交叉结构面, 裂隙岩体, 弱化效应

Abstract:

Aiming at the influence mechanism of crossed joints on the strength and deformation properties of jointed rock mass, the Particle Flow Code (PFC3D) was employed. Combined with the parameter calibration process. Three types of blocks (Series S, SD and SN) with different numbers of joint sets were considered in this article. The uniaxial compression test was carried out to study the effect of crossed joint sets on the strength, deformation and failure characteristics of jointed rock mass. The test results show that: 1) The crackinitiation stress and peak stress of the sample with crossed joint sets was relatively higher in comparison with the sample with the same weakest single joint set. 2) The effect of crossed joint sets on the stress field was carried out. Stress concentration was found with the increase of axial stress. 3） The cracks number of the sample with crossed joint sets was relatively higher in comparison with the sample with the same weakest single joint set under the same stress. 4) The crossed-joints was found to have significant effect on the failure mode of jointed rock mass in a certain range.

Key words: particle flow code, crossed joint sets, jointed rock mass, weakening effect