›› 2018, Vol. 39 ›› Issue (8): 2865-2872.doi: 10.16285/j.rsm.2017.1080

• 基础理论与实验研究 • 上一篇    下一篇

岩石节理分级剪切加载-蠕变-卸载的能量与变形特征

翟明磊1，郭保华1, 2，李冰洋3，焦 峰1   

  1. 1. 河南理工大学 能源科学与工程学院，河南 焦作454000；2. 河南理工大学 煤炭安全生产河南省协同创新中心，河南 焦作454000； 3. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071
  • 收稿日期:2017-06-02 出版日期:2018-08-11 发布日期:2018-09-02
  • 通讯作者: 郭保华，男，1979年生，博士，副教授，主要从事岩石裂隙变形与渗流方面的研究工作。E-mail：guobaohua@139.com E-mail:minglzhpu@126.com
  • 作者简介:翟明磊，男，1991年生，硕士研究生，主要从事岩石节理剪切流变方面的学习与研究工作。
  • 基金资助:

    国家自然科学基金项目（No. 51109076）。

Energy and deformation characteristics of rock joints under multi-stage shear loading-creep-unloading conditions

ZHAI Ming-lei1, GUO Bao-hua1, 2, LI Bing-yang3, JIAO Feng1   

  1. 1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000 China; 2. The Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo, Henan 454000 China; 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2017-06-02 Online:2018-08-11 Published:2018-09-02
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51109076).

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摘要： 为分析岩石节理在剪切加载-蠕变-卸载下的能量演化与变形特征，利用GCTS（RDS?200型）岩石剪切测试系统对人工劈裂岩石节理进行分级剪切加载-蠕变-卸载试验。结果表明：在法向应力小于6.5 MPa和大于7.8 MPa时，滞回环面积与循环级数分别符合线性和指数关系；总变形能和弹性变形能与法向应力呈正相关，与循环级数呈指数关系；塑性变形能与循环级数和法向载荷呈正相关。各级剪切应力加载终止时的剪切位移外包络线与直剪应力-位移曲线变化趋势相同，具有加速上升段、匀速上升段和匀速下降段；累积剪切塑性变形随循环级数增加而增大，但增大速率逐渐变慢；各级剪切加、卸载曲线均能以剪切滑移点为界分为两个阶段；剪切失稳前，加、卸载阶段的法向位移-剪切应力曲线出现在上一循环前方，循环剪切加载和（或）蠕变结束时的累积法向变形出现从增加到减小的现象。

关键词: 岩石节理, 循环加卸载, 剪切蠕变, 能量演化, 变形特征

Abstract: This study aims to investigate the energy and deformation characteristics of rock joints under multi-stage shear loading-creep-unloading conditions. The experiments were conducted on jointed marble specimens using a GCTS (RDS?200) servo-controlled testing machine. The results showed that the area of the hysteresis loop had linear or exponential relationships with cycling numbers, when the normal stress was lower than 6.5 MPa or higher than 7.8 MPa, respectively. The total deformation energy and the elastic deformation energy were positively related to the normal stress and exponentially related to the cyclic number, respectively. However, the plastic deformation energy was positively correlated with cycle number and normal load. At the ends of different levels of shear stress loading, the outer envelope of the shear displacement curve had the same trend as the direct shear displacement-shear stress curve. It could be divided into three stages: accelerated growth, linearly increasing segment and linearly decreasing segment. The accumulated plastic displacement increased with increasing loading cycles, but the increasing rates decreased gradually. Each shear loading or shear unloading curve can be divided into two stages according to the shear sliding point. Before the shear failure of rock joint, the normal displacement-shear curve became lower than the later ones under shear loading and unloading conditions. The accumulated normal displacement changed from increasing to decreasing at the ends of cyclic shear loading and creeping at each stress level.

Key words: rock joints, cycling loading and unloading, shear creep, energy evolution, deformation characteristic

中图分类号: 

  • TU 453

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