›› 2015, Vol. 36 ›› Issue (7): 1892-1898.doi: 10.16285/j.rsm.2015.07.009

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on combined fracture criterion of rock under compression-shear stress

ZHENG An-xing，LUO Xian-qi   

  1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2014-03-25 Online:2015-07-11 Published:2018-06-13

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Abstract: By considering the effect of friction between the crack surfaces on the crack-tip stress field, the fracture angle value of the compression-shear combined crack is deduced by using the maximum circumferential stress criterion. According to the failure characteristics of the crack tip of rock subjected to biaxial stresses, a compression-shear combined fracture criterion is proposed by combining the maximum circumferential stress criterion with the modified Griffith strength theory. The frictional effect of the closed crack propagation is also considered in the criterion. The calculation results show that the fracture angle is influenced by the angle between the crack and the loading orientation, the friction coefficient of the crack surfaces and the lateral pressure coefficient. When the fracture angle of the compression-shear combined crack is one specific value, the ratio of the fracture toughness of the pure mode-II crack to that of pure mode-I crack is only influenced by the friction coefficient of the crack surfaces. This study is essential for the research on the failure models of fractured rock mass under the combined compression-shear stress.

Key words: modified Griffith criterion, compression-shear crack, fracture criterion, fracture angle, rock mechanics

CLC Number: 

  • TU 452
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