Rock and Soil Mechanics ›› 2018, Vol. 39 ›› Issue (12): 4313-4324.doi: 10.16285/j.rsm.2017.0883

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study on shear-seepage for coal-rock shear fracture surface morphological characteristics

XU Jiang 1, 2, WANG Wei1, 2, LIU Yi-xin 1, 2, PENG Shou-jian 1, 2, WU Shan-kang1, 2, QU Jia-mei1, 2, XIAO Zhi-yuan1, 2   

  1. 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing 400044, China
  • Received:2017-05-05 Online:2018-12-11 Published:2018-12-31
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51474040，51434003) and the National Science and Technology Major Project of the Ministry Science and Technology of China (2016ZX05044-02).

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Abstract: Based on a self-developed shear-seepage coupling testing device for coal-rock, experimental tests were conducted on coal-rock specimens in the process of CO2 injection to investigate shear-seepage of coupled properties. Meanwhile, the sheared fracture surfaces from different normal stresses were scanned, and their characteristics were analysed through two-dimensional (2D) and three-dimensional (3D) statistical parameters. The results show that the shear failure of coal-rock specimen is mainly plastic damage under the condition of constant gas pressure. With the increase of normal stress, the peak shear stress of coal-rock increases as well, and the peak shear stress and normal stress of coal-rock approximate a linear relationship. The normal stress is one of the influence factors of sheared fracture surface characteristics. Under the condition of constant gas pressure, when the normal stress increased, 2D and 3D statistical parameters generally showed a trend of decrease, in other words, the sheared fracture roughness and prominence of the coal-rock decreased with the increase of normal stress. Through analysis on coal-rock shearing process, the normal stress can affect the shape and seepage characteristics of sheared fracture surface of the specimen by influencing the extension area of the shear crack.

Key words: coal-rock, gas pressure, normal stress, shear-seepage, shear fracture surface

CLC Number: 

  • TU 454
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