Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (3): 852-860.doi: 10.16285/j.rsm.2017.0964

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of shear deformation characteristics of marble dentate joints

ZHOU Hui1, 2, CHENG Guang-tan1, 2, 3, ZHU Yong1, 2, CHEN Jun1, 2, LU Jing-jing1, 2, CUI Guo-jian1, 2, YANG Pin-qing4   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an, Shandong 271018, China; 4. China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400039, China
  • Received:2017-05-15 Online:2019-03-11 Published:2019-04-03
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51427803, 51709257) and the National Program on Key Basic Research Project of China(973 Program)(2014CB046902).

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Abstract: This study is aimed to investigate the regularities of the shear strength, shear deformation and other mechanical properties of joint rock mass with different roughnesses under compression-shear stress. Marble specimens were prepared with the dentate height of 0, 1 and 3 mm, respectively. Then direct shear tests were conducted on the marble specimens under different normal stresses. Experiment results show that curves of shear stress and displacement can be divided into two types: sliding failure type and peak shear type. The climbing-gnawing process of joints goes through four stages: the compaction stage, the climbing stage, the saw-tooth cutting stage and the completely crushing stage. The curves of shear strength with the normal stress of the dentate joint present more obviously three-segment line feature, and a trilinear shear strength criterion is established. The curves of shear stiffness with normal stress present a convex type, and a shear stiffness model is put forward. The dilatancy curves of dentate joint present firstly shear contraction and then shear dilation, and an empirical formula for evaluating shear dilation is proposed.

Key words: dentate joints, direct shear test, strength characteristics, dilatancy characteristics, shear stiffness

CLC Number: 

  • TU 451
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