Rock and Soil Mechanics ›› 2018, Vol. 39 ›› Issue (12): 4369-4375.doi: 10.16285/j.rsm.2017.2281

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Fracture characteristics of granite with mode-I pre-crack at different loading rates

SONG Yi-min1, XING Tong-zhen1, LÜ Xiang-feng2, ZHAO Ze-xin1, DENG Lin-lin1   

  1. 1.School of Civil Engineering, North China University of Technology, Beijing 100144 China; 2. Geotechnical Engineering Research Center, Beijing Institute of Municipal Engineering, Beijing 100037, China
  • Received:2017-11-16 Online:2018-12-11 Published:2018-12-31
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51474013).

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Abstract: The deformation measurement system was built with a CCD camera and a high-speed camera. Experimental tests were conducted on rectangular granite specimens with pre-cracks of mode-I under different loading rates. The speckle images captured in the process of experiments were analysed by the digital speckle correlation method (DSCM). We studied the speed of crack growth, crack-tip opening displacement, crack tip opening angle and crack stress intensity factor (SIF) of granite specimens with pre-cracks of mode-I under different loading rates. The initial speed of the crack growth of granite specimens increases linearly with the loading rate. With the increase of loading rate, the maximum speed crack increased rapidly at first and then slowly. At different loading rates, the crack-tip opening displacement of granite specimens showed three stages of evolution: nonlinear slow growth，rapid growth, and linear growth. In the linear growth stage, the slope of the curve increased with the increase of loading rate. With the increase of loading rate, the initial crack opening angle of granite specimen decreases gradually and then stabilises to 0.1°～0.13°. Before the initial fracture of granite specimens, the SIF value increased exponentially with the increase of loading rate.

Key words: digital speckle correlation method, rock fracture, crack tip opening displacement, stress intensity factor, crack growth rate, crack tip opening angle

CLC Number: 

  • TU454
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