›› 2012, Vol. 33 ›› Issue (2): 354-360.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of shear characteristics by simulating rock mass joints sample with second-order asperities

ZHU Xiao-ming1, 2, LI Hai-bo1, LIU Bo1, ZOU Fei1, MO Zhen-ze1, SONG Quan-jie1, NIU Lei1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Gansu Province Transportation Planning, Survey and Design Institute Co., Ltd., Lanzhou 730030, China
  • Received:2010-07-30 Online:2012-02-10 Published:2012-02-14

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Abstract: The monotonic shear tests are carried out to investigate the mechanical properties of rock mass joints with the second-order asperities, which simulated by small regular saw tooth; and gypsum material is used to simulating rock mass joint samples. Five artificial joint samples with different heights of second-order asperities are tested under low normal stress, which keep constant during the tests. Characteristics of shear strength and deformation are analyzed; an interpretation of the joints failure modes is given. Based on the experimental results, it can be found that the second-order asperities have important influence on the shear mechanical properties of joints, and the mechanical properties are different from the joints with first-order asperities only, for which shear stress vs. shear displacement curve just has one peak shear stress; by contrast, the joints with second-order asperities have multi-peak shear stress, which decreases gradually one after one with the increase of shear displacements. As well, the dilatancy curves of the joints with second-order asperities show wave shape. With the increase of second-order asperities height, peak shear strength increases; the failure modes appear wearing, many-times shearing of asperities, and one-time shearing failure of asperities.

Key words: rock mechanics, joints, second-order asperities, shear characteristics, shear stress, dilatancy

CLC Number: 

  • TU 452
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