JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2014, Vol. 31 ›› Issue (11): 26-30.DOI: 10.3969/j.issn.1001-5485.2014.11.0062014,31(11):26-30


Crack Propagation Mechanism of Inhomogeneous Medium under Dynamic Load

ZHONG Bo-bo,ZHANG Yong-bin,BAI Xiang-yuan,LI Hong   

  1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2014-08-02 Revised:2014-11-05 Online:2014-11-01 Published:2014-11-05

Abstract: The influences of crack inclination angle, rock bridge’s inclination angle and biaxial load on rock crack propagation mode were studied by using Rock Failure Process Analysis(RFPA-dynamic) on rock samples with pre-existing cracks. The results show that 1) under uniaxial dynamic load, crack inclination angle and rock bridge's inclination angle have little effect on crack propagation , and the crack expands in the direction perpendicular to load; 2) the release of accumulated energy of acoustic emission can be divided into four stages under axial dynamic load; 3) under biaxial load, along with the decrease of load ratio, the bending radian of crack increase and the crack is gradually perpendicular to the horizontal load; 4) when the inclination angle of rock bridge is constant with the increase of crack inclination angle, crack tends to the vertical direction under biaxial dynamic load; 5) under uniaxial static load, crack inclination angle and rock bridge’s inclination angle have significant effect on crack propagation mode but have little effect under uniaxial dynamic load.

Key words: rock mechanics, inhomogeneous medium, dynamic load, crack propagation, numerical simulation

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