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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第10期    总第290期    2018年10月

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文章编号:1672-7207(2018)10-2498-10
平行节理相互作用对节理岩体的力学行为影响
王飞,曹平,曹日红,高青鹏,熊心广,王柱

(中南大学 资源与安全工程学院,湖南 长沙,410083)

摘 要: 以类岩材料制作平行节理试样并开展压剪实验,采用声发射系统监测试样加载过程,研究节理相互作用对岩体力学行为的影响。研究结果表明:1) 节理试样在压剪加载下可分4种破坏模式:共面剪切破坏;沿节理面剪切破坏;沿剪切应力面剪切破坏;类完整型剪切破坏。倾角对试样破坏模式起决定性作用,重叠度影响试样裂隙的发育。2) 试样峰值剪切强度随倾角增加先增大后减小并在45°取得最大值;随着节理重叠度的增大,峰值剪切强度逐渐减小;剪切峰值强度对倾角因素更敏感。3) 不同倾角试样的剪切应力-位移曲线差异主要体现在破裂后阶段,试样的声发射计数变化规律与破坏模式相对应;不同重叠度试样应力-位移曲线形态相似,试样的声发射计数变化规律相似,但计数峰值随重叠度的增大逐渐减小。

 

关键字: 节理相互作用;节理重叠度;压剪试验;力学行为;声发射

Influence of parallel joint interaction on mechanical behavior of jointed rock mass
WANG Fei, CAO Ping, CAO Rihong, GAO Qingpeng, XIONG Xinguang, WANG Zhu

School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Abstract:In order to investigate the influence of joint interaction on the mechanical behavior of rock mass, the compression shear test loading on the parallel jointed specimens was carried out, and the acoustic emission system was used to monitor the loading process. The results show that: 1) Under compressive-shear loading, the failure mode of the jointed specimen can be classified into four types: coplanar shear failure; shear failure along the joint plane; shear failure along the shear stress plane; similar integrity shear failure. The inclination angle has a decisive effect on the failure mode of the specimen, and the joint overlap affects the growth of the specimens’ crack. 2) The peak of shear strength firstly increases and then decreases with the increase of the inclination angle, and reaches the maximum at 45°. The peak of shear strength decreases with the increase of the joint overlap. The peak of shear strength is more sensitive to the joint inclination. 3) The difference of shear stress-displacement curve for different inclination is mainly reflected in the post-rupture stage; the variation of the acoustic emission count for different joint inclination samples corresponds to the failure mode of specimen. The stress-displacement curves of different overlapping specimens are similar, and the change of acoustic emission count is similar, but the peak value of the acoustic emission count decreases with the increase of the joint overlap.

 

Key words: joint interaction; joint overlap; compression-shear test; mechanical behavior; acoustic emission(AE)

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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