Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S1): 542-552.doi: 10.16285/j.rsm.2020.1028

• Numerical Analysis • Previous Articles     Next Articles

Particle flow code analysis of the effect of discrete fracture network on rock mechanical properties and acoustic emission characteristics

HU Xun-jian1, 2, BIAN Kang1, 2, LIU Jian1, 2, XIE Zheng-yong3, CHEN Ming1, 2, LI Bing-yang1, 2, CEN Yue1, 2   

  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. Hubei Road and Bridge Group Tianxia Construction Co. Ltd., Wuhan, Hubei 430058, China
  • Received:2020-07-18 Revised:2021-03-04 Online:2022-06-30 Published:2022-07-15
  • Supported by:
    This work was supported by the National Key R&D Program of China(2016YFC0401802), the State Key Program of National Natural Science of China(51539002), the National Natural Science Foundation of China(51779249) and the Natural Science Foundation of Hubei Province (E0312502).

Abstract: Based on the particle flow code platform, using image processing technology and Monte Carlo method, a discrete fracture network is generated. Combined with the grain-based model, the numerical modeling of the granite mesostructure is carried out. Then from a micro perspective, the effect of the discrete fracture network on rock strength and deformation properties and acoustic emission characteristics is described. The main conclusions are as follows: (1) The average length and density of the fractures affect the mechanical properties of the rock. The uniaxial compressive strength and elastic modulus of the rock decrease with the increase of the fracture density. (2) Rock failure under uniaxial compression is dominated by intergranular tensile cracks and intragranular tensile cracks. (3) The discrete fracture network is closely related to the acoustic emission events of the rock. With the increase of fracture density, the b value of acoustic emission and the D value of fractal dimension both show a downward trend. The sharp drop of b and D indicate that the rock instability failure. (4) The discrete fracture network has a certain influence on the magnitude of acoustic emission events. Acoustic emission events with high rupture intensity are prone to occur near discrete fracture networks. In summary, conclusions based on the mesoscopic rock fracture mechanism and acoustic emission phenomena obtained from the joint modeling of discrete fracture networks and grain-based models can effectively make up for the shortcomings of existing research methods in laboratory experiments and provide strong support for the stability evaluation and engineering construction of rock mass with more complex fracture network in the field.

Key words: discrete fracture network, grain-based model, acoustic emission, granite, particle flow code simulation

CLC Number: 

  • TU 452
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