Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (2): 610-615.doi: 10.16285/j.rsm.2017.1329

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Shear behaviors and fractal dimensions of carol sand at large shear strains

ZHANG Xiao-yan1, 2, CAI Yan-yan2, 3, ZHOU Hao-ran1, YANG Yang1, LI Yu-long1   

  1. 1. School of Mechanics & Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221008, China; 3. Institute of Geotechnical Engineering, Huaqiao University, Xiamen, Fujian 361021, China
  • Received:2017-08-14 Online:2019-02-11 Published:2019-02-14
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51774147, 51809264), the Open Research Fund of State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology (SKLGDUEK1701), the Fundamental Research Funds for the Central Universities (2017QL04) and the Yueqi Distinguished Scholar Project, China University of Mining & Technology (Beijing).

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Abstract: Wille Geotechnik ring shear apparatus was applied to conduct large shear strain ring shear tests on three samples of uniform carol sand with different sizes. This paper investigates the effects of particle breakage on peak strength and residual strength. The experimental results indicate that particle breakage increases with increasing the shear distance, and also increases with increasing particle size. Particle breakage has subtle or negligible effect on the peak strength and residual strength. However, particle breakage remarkably influences the volumetric strain, where the volumetric strain increases with increasing the particle size because of large particles suffered greater particle breakage. An equation for fractal dimension considering length-width ratio, sophericity and camber is established. As the self-similar and no scale of particle along with ranges of sizes, the fractal dimension calculated through the cumulative number of particles with consideration of particle shape is the same with that of particles without considering of particle shape.

Key words: ring shear tests, particle breakage, coral sand, fractal dimension

CLC Number: 

  • TU 441
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