中山大学学报自然科学版 ›› 2019, Vol. 58 ›› Issue (3): 118-130.doi: 10.13471/j.cnki.acta.snus.2019.03.015

• 论文 • 上一篇    下一篇

交叉结构面对岩体力学特性的弱化效应

刘佳明1,孙少锐2,张中行1,高林1,苏运基1   

  1. 1.中国电建集团海南电力设计研究院有限公司,海南 海口570100;
    2.河海大学地球科学与工程学院,江苏 南京 210098
  • 收稿日期:2018-08-10 出版日期:2019-05-25 发布日期:2019-05-25

Weakening effect of crossed joints on the mechanical characteristics of rock mass

LIU Jiaming1, SUN Shaorui2, ZHANG Zhonghang1, GAO Lin1, SU Yunji1   

  1. 1.Power China Hainan Electric Power Design and Research Institute, Haikou 570100, China;
    2.School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China
  • Received:2018-08-10 Online:2019-05-25 Published:2019-05-25

摘要:

针对交叉结构面对裂隙岩体强度和变形性质的影响,采用颗粒流方法并结合参数校准过程,生成三组(S、SD和SN组)不同结构面组合的试样模型,并对试样模型进行了单轴压缩试验;研究了单轴压缩下交叉结构面的相互作用,以及其相互作用对试样强度、变形和破坏过程的影响。研究表明:1)包含交叉结构面的试样的起裂强度和峰值强度均小于仅包含最不利结构面的单裂隙试样;2)随着轴向荷载增加,结构面交叉处出现显著的应力集中现象,进而促进微裂纹的发展;3)在相同荷载条件下,包含交叉结构面的试样中微裂纹数量明显多于仅包含最不利结构面的单裂隙试样;4)当试样中结构面的倾角在一定区间内时,交叉结构面对试样的破坏形式有明显的影响。

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

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