Failure characteristics of rock-like materials with single flaws under uniaxial compression
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A uniaxial compression test was conducted with a servo loading apparatus to study the failure of a rock-like specimen with a pre-existing single flaw. The evolution of cracks was monitored with digital image correlation technology and simulated with the expanded distinct element method based on the strain strength criterion. The concentration and evolution of the principal strain field were found to be consistent with the initiation, propagation, and coalescence of cracks. As the inclination angle increased, the position of the maximum principal strain concentration changed from within the flaw to the flaw tips, and the distribution of the horizontal displacement field changed from symmetric to antisymmetric. The initiation stress and peak strength were affected by the inclination angle; they were minimum when the inclination angle was 60°. As the inclination angle increased, the failure mode of the specimens transformed from mostly tensile failure to mostly shear failure.
KeywordsSingle flaw Uniaxial compression Digital image correlation method (DIC) Strain field Expanded distinct element method (EDEM)
The authors would like to acknowledge the financial support of the National Key Research and Development Plan [grant number 2017YFC0805004], National Natural Science Foundation of China [grant number 41202193,41572262], and the Shanghai Rising-Star Program [grant number 17QC1400600].
- Hu M, Liu Y, Ren J, Wu R, Zhang Y (2017) Laboratory test on crack development in mudstone under the action of dry-wet cycles. Bull Eng Geol Environ 2017(4):1–14Google Scholar
- Huang J, Chen G, Zhao Y, Wang R (1990) An experimental study of the strain field development prior to failure of a marble plate under compression. Tectonophysics 175(1):269–284Google Scholar
- Huang ML, Tang CA, Zhu W (2000) Numerical simulation on failure process of rock. Chin J Rock Mech Eng 19(4):468–471Google Scholar
- Jia CJ, Xu WY, Wang SS, Wang RB, Yu J (2018) Experimental analysis and modeling of the mechanical behavior of breccia lava in the dam foundation of the Baihetan hydropower project. Bull Eng Geol Environ. https://doi.org/10.1007/s10064-018-1228-3
- Jiang MJ, Chen H, Zhang N, Fang R (2014) Distinct element numerical analysis of crack evolution in rocks containing pre-existing double flaw. Rock Soil Mech 35(11):3259–3268Google Scholar
- Reyes O, Einstein HH (1991) Failure mechanisms of fractured rock—a fracture coalescence model. Proc seventh Int Congr. Rock Mech 1:333–340Google Scholar
- Wong LNY, Einstein HH (2006) Fracturing behavior of prismatic specimens containing single flaws. In: Proceedings of the 41st US symposium on rock mechanics, 17–21 June 2006, Golden, ColoradoGoogle Scholar
- Zhang XP, Wong LNY (2012) Cracking processes in rock-like material containing a single flaw under uniaxial compression: a numerical study based on parallel bonded-particle model approach. Rock Mech Rock Eng 45(5):711–737Google Scholar
- Zhao C, Ma CC, Zhao CF, Du SG, Bao C (2017) Crack propagation simulation of rock-like specimen using strain criterion. Eur J Environ Civ Eng. https://doi.org/10.1080/19648189.2017.1359677
- Zhao C, Niu JL, Zhang QZ, Zhao CF, Xie JF (2018a) Buckling behavior of a thin-walled cylinder shell with the cutout imperfections. Mech Adv Mater Struct. https://doi.org/10.1080/15376494.2018.1444225
- Zhao C, Zhou YM, Zhao CF, Bao C (2018b) Cracking processes and coalescence modes in rock-like specimens with two parallel pre-existing cracks. Rock Mech Rock Eng. https://doi.org/10.1007/s00603-018-1525-y