Abstract
In this paper, the coal rock is taken as the research object, and the saw-2000 rock servo test system is used to creep pre damage the coal sample, and the uniaxial compression failure test is carried out. The fracture surface of coal sample after uniaxial compression was observed by xpv-900e computer transmission and reflection polarizing microscope, and the meso images of the fracture surface under different magnification were collected. The meso images obtained were binary processed by ImageJ software and the fractal dimension was calculated. The test results show that: with the increase of creep pre damage degree, the damage degree of coal increases; the peak strength first increases and then decreases; the overall change trend of elastic modulus first increases and then decreases; the micro cracks of coal sample first close and then expand with the increase of creep pre damage degree; the fractal dimension value decreases with the increase of the multiple of mirrors, and then decreases with the increase of damage degree.
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References
Chen L, Wang CP, Liu JF et al (2017) Effects of temperature and stresson the time-dependent behavior of Beishan granite. Int J Rock Mech Min Sci 54(2):316–323
Lemaitre J (1968) Evolution of dissipation and damage in metals, submitted to dynamic loading. Proc. I.C.M.U, Kyoto
Li Y, Xia C (2000) Time-dependent tests on intact rocks in uniaxial compression. Int J Rock Mech Min Sci 37(3):467–475
Li HM, Li ZH, Su CD (2004) Testing study on creep characteristics of marble. Chin J Rock Mech Eng 23(22):3745–3749 (in Chinese)
Liu BG, Cui SD (2010) Experimental study of creep damage of mudstone. Chin J Rock Mech Eng 29(10):2127–2133 (in Chinese)
Munson DE, Devries KL, Fossum AF et al (1993) Extension of the M-D model for treating stress drops in salt. In: Proceedings of 3rd conference on the mechanical behavior of salt. Palaiseau, pp 31–44
Peng RD, Xie HP, Ju Y (2004) Computationmethod of fractal dimension for 2-D digital image. J China Univ Min Technol 33(1):19–24 (in Chinese)
Su CD, Chen XX, Yuan RF (2014) Analysis of deformation and strength characteristics of coal samples under uniaxial compression under step relaxation. Chin J Rock Mech Eng 33(6):1135–1141 (in Chinese)
Su CD, Xiong ZQ, Shaowei L et al (2016) Experimental study of time-lag deformation and failure properties of coal under uniaxial compression. Rock Soil Mech 37(3):665–671 (in Chinese)
Sun J (2007) Rock rheological mechanics and its advance in engineering applications. Chin J Rock Mech Eng 26(6):1081–1106 (in Chinese)
Tian HM, Chen W, Tian T et al (2012) Experimental and theoretical studies of creep damage behavior of soft rock. Chin J Rock Mech Eng 31(3):610–617 (in Chinese)
Wang JB, Liu XR, Yang X et al (2013) Test on creep properties of salt rock under different loading paths. J PLA Univ Sci Techno Nat Sci 14(5):517–523 (in Chinese)
Yang CH, Daemen JJK, Yin JH (1999) Experimental investigation of creep behavior of salt rock. Int J Rock Mech Min Sci 36(2):233–242
Yang CH, Bai SW, Wu YM (2000) Stress level and loading path effect on time dependent properties of salt rock. Chin J Rock Mech Eng 19(3):270–275 (in Chinese)
Yang YS, Zhou H, Zhang CQ et al (2011) Experimental investigation on time-lag failure properties of marble under uniaxial compressive test. Rock Soil Mech 32(9):2714–2720 (in Chinese)
Yang HW, Xu J, Nie W et al (2015) Experimental study on creep of rocks under step loading of seepage pressure. Chin J Geotech Eng 37(9):1613–1619 (in Chinese)
Zhang QS, Yang GS, Ren JX (2003) New study of damage variable and constitutive equation of rock. Chin J Rock Mech Eng 1:30–34 (in Chinese)
Zhang Y, Shao J, Xu W et al (2016) Time-dependent behavior of cataclastic rocks in a multi-loading triaxial creep test. Rock Mech Rock Eng 49(9):3793–3803
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Yang, H., Liu, W. Microscopic Damage Mechanism of Coal Sample Under Uniaxial Compression Test Under Different Creep Pre-damage. Geotech Geol Eng 38, 1675–1687 (2020). https://doi.org/10.1007/s10706-019-01123-5
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DOI: https://doi.org/10.1007/s10706-019-01123-5