[1]郇久阳,张志强,李宁.剪切过程中岩石节理宏细观力学特征研究[J].西安建筑科技大学学报(自然科学版),2017,(06):852-859.[doi:10.15986/j.1006-7930.2017.06.013]
 HUAN Jiuyang,ZHANG Zhiqiang,LI Ning.Research of macro-and meco-mechanical characteristics of rock joints during shear process[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2017,(06):852-859.[doi:10.15986/j.1006-7930.2017.06.013]
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剪切过程中岩石节理宏细观力学特征研究()
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西安建筑科技大学学报(自然科学版)[ISSN:1006-7930/CN:61-1295/TU]

卷:
期数:
2017年06期
页码:
852-859
栏目:
出版日期:
2017-12-31

文章信息/Info

Title:
Research of macro-and meco-mechanical characteristics of rock joints during shear process
文章编号:
1006-7930(2017)06-0852-08
作者:
郇久阳张志强李宁
(西安理工大学 岩土工程研究所,陕西 西安 710048)
Author(s):
HUAN Jiuyang ZHANG Zhiqiang LI Ning
(Institute of Geotechnical Engineering, Xi′an University of Technology, Xi′an 710048,China)
关键词:
岩石节理起伏角裂纹扩展剪切过程PFC破坏模式
Keywords:
rock joint slop angle crack propagation shear process PFC failure mode
分类号:
TU452
DOI:
10.15986/j.1006-7930.2017.06.013
文献标志码:
A
摘要:
岩石节理剪切过程中,节理面局部细观破坏控制着节理剪切强度与破坏过程. 借助离散元软件PFC(Particle Flow Code)建立了不同起伏角规则岩石节理试样,在编制了伺服模块的基础上,模拟了试样在不同法向应力下的直剪试验. 通过监测剪切位移和剪力,对节理试样在不同法向应力下的剪切应力.剪切位移曲线规律和剪切应力峰值特征进行了细致讨论. 基于PFC内嵌的fish语言,编制了裂纹扩展监测模块,从细观角度描述了岩石试样的破坏模式. 试样破坏主要集中在节理凸起附近,主要分为滑移破坏、凸起中部剪断破坏和凸起根部剪断破坏三种,破坏模式和规模受节理起伏度以及法向应力影响较大. 将剪切应力变化曲线和裂纹扩展曲线综合分为四个阶段,试样裂纹扩展对剪切应力增长有抑制作用,但相比其存在滞后效应. 试验过程中节理凸起抵抗剪切荷载的能力越强,破坏程度会越大,表现为试样产生裂纹数与剪切应力峰值符合正相关趋势.
Abstract:
During shear process, shear strength and failure process of joint are controlled by local micro damage. Model of rock joint having different slop angle are generated by discrete element software PFC, and direct shear tests under different normal stresses are conducted on the basis of servo module. The law of shear stress-shear displacement curves of samples and characteristics of peak shear stresses under different normal stresses has been carefully discussed by monitoring shear displacement and shear force. In addition, the monitoring module of crack propagation has been prepared by fish language embedded in PFC, and failure mode of rock joint is described from the microscopic point of view during the shearing process. The failure of sample is mainly concentrated on the vicinity of joint, and they are mainly divided into three kinds including slip failure, shear failure in the central of asperity and shear failure in the root of asperity. The failure mode and scale are greatly influenced by the slop angle of joint and normal stress. Change curve of shear stress and crack growth curve are divided into four stages integrally. It is found that the growth of shear stress is inhibited by crack growth in the sample, but there is a lag effect. During the test, the stronger ability to resist the shear load, the greater damage degree will be. Results show that crack number and peak shear stress are in accordance with the positive correlation trend.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-12-04 修改稿日期:2017-11-02 基金项目:国家自然科学基金资助项目(11572246,51179153);陕西省教育厅科研计划资助项目(17JS091) 第一作者:郇久阳(1990-),男,博士生,主要从事岩体裂隙力学及渗流分析方面的研究 E-mail: 424139375@qq.com
更新日期/Last Update: 2018-02-12