›› 2015, Vol. 36 ›› Issue (S2): 208-214.doi: 10.16285/j.rsm.2015.S2.027

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of effects of fracture type on strength characteristics and failure modes of fractured rockmass

LIU Xue-wei1, LIU Quan-sheng1, CHEN Yuan2, LI Qiang3   

  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. Wuhan JingLi Engineering Design Consulting Co., Ltd., Wuhan, Hubei 430071, China; 3. Mid-South Design and Research Institute, China Hydropower Engineering Consulting Group Co., Ltd., Changsha, Hunan 410014, China
  • Received:2014-11-05 Online:2015-08-31 Published:2018-06-14

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Abstract: A series of uniaxial compression tests is carried out on the gypsum specimens with different fracture types, including single fracture, two coplanar fractures, T-shape and X-shape cross-fractures, through the electrohydraulic servo machine RMT-150C. Then, influences of fracture types on failure modes and strength characteristics are investigated. The experimental results show that: (1) The failure mode is initial fractures propagation for all the specimens with different fracture types, which means that the relationship between failure mode and fracture type is not obvious. (2) The fracture type can affect the uniaxial compressive strength (UCS) of specimens significantly, with the fracture type transfer from single fracture to the X-shape cross-fractures, the UCS increase gradually; and the total acoustic emission energy of fracture specimens initiation and unstable increase too. Furthermore, the mechanism of how the fracture type affects the UCS is studied preliminarily. The research results can reflect the influence laws of different fracture types on the stability of rock mass.

Key words: fracture type, failure mode, rockmass strength characteristic, experimental study

CLC Number: 

  • TU 452
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