›› 2011, Vol. 32 ›› Issue (4): 997-1002.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mechanism of fracture mechanics and physical model test of rocks crack expanding under tension-shear stress

HUANG Da1, 2, 3，JIN Hua-hui1，HUANG Run-qiu3   

  1. 1. College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2. Key Laboratory for Construction & New Technique of Upland City, Ministry of Education, Chongqing University, Chongqing 400045, China; 3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
  • Received:2009-12-24 Online:2011-04-10 Published:2011-04-29

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Abstract:

The rocks cracks are in tension-shear stress state when excavated and unloading. Based on the analysis of stress and deformation for the crack in tension-shear sress state, the mechanism of its expanding is studied by linear elastic fracture mechanics theory and physical model test. The researches show that the frictional force along crack plane is vanished when cracks are in tension-shear stress state; the cracks expanding is started up in the direction of the fracture toughness KI of mode I tensile crack being minimal, and ultimately perpendicular to tension stress. The total displacement is parallel to tension stress under tension-shear stress state, the dynamic stress intensity factor of branching cracks tip in the process of expanding and its expanding length are solved based on energy and linear elastic fracture mechanics theory on the logical displacement hypothesis. The theory results are examined and certified by physical model experiment of some single crack under tension-shear stress.

Key words: rock mechanics, fracture mechanics, tension-shear stress state, rocks crack expanding, dynamic stress intensity factor

CLC Number: 

  • TU 452
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