›› 2015, Vol. 36 ›› Issue (4): 965-970.doi: 10.16285/j.rsm.2015.04.008

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experiment study of the dynamic fractures of rock under impact loading

SONG Yi-min，HE Ai-jun，WANG Ze-jun，CHEN Hao-zhe   

  1. School of Civil Engineering, North China University of Technology, Beijing 100144, China
  • Received:2013-12-12 Online:2015-04-11 Published:2018-06-13

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Abstract: Five groups of impact load-driven fracturing experiments were performed on the granite specimens with different pre-existing crack lengths. The dynamic load was generated by a self-developed impact equipment with an adjustable dropping velocity hammer. The fracturing process of the sample was monitored by using high speed cameras with digital acquisition and the digital speckle correlation method. The characteristics of the dynamic fractures of Type I in the rock specimens under impact loading are quantitatively analyzed, including the development of displacement, the opening displacement of crack tip, expansion history of crack tip and stress intensity factor of dynamic fracturing. Experimental results show that from the moment that the hammer dropped down to the moment when the cracking process began, the crack tip stress intensity factor KI for an individual specimen constantly increase, and the magnitude of KI is greater than that of KII by 1-2 orders. For different specimens with pre-cracks under impact loading, stress intensity factor increases with the pre-cracking length.

Key words: digital speckle correlation method, stress intensity factor, crack propagation speed, rock fracture, impact load

CLC Number: 

  • TU 443
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