Abstract
Compared with the surrounding rock of single rock roadway, the uneven deformation of surrounding rock of thin coal seam roadway is more prominent. This uneven deformation characteristic of thin coal seam surrounding rock between the different surrounding rocks has greatly hindered the mining of thin seam coal mines. Based on the uniaxial loading tests and uniaxial cyclic loading tests of the coal–rock combination, the deformation characteristics and loading failure of coal–rock combination with different height ratios of coal to rock is studied. The results show that the uniaxial compression strength of coal–rock combinations increases with coal height. By comparing and analyzing the energy evolution of the composite with different height ratio, the energy dissipation of the coal–rock combination decreases suddenly between RCR-0.5 and RCR-1 specimens. The coal body is constrained by the sandstone at both ends of the composite specimen, which improved the strength of the coal body. The effect of this constraint decreases with the distance from the coal–rock interface. The failure mode of the composite specimens is dominated by the coal body, which is from splitting failure to shear failure finally becomes middle coal extrusion.
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References
Chen Y, Zuo JP, Song HQ et al (2018) Deformation and crack evolution of coal–rock combined body under cyclic loading-unloading effects. J Min Saf Eng 35(3):826–833
Chen GB, Qin ZC, Zhang GH et al (2020) Law of energy distribution before failure of loaded coal–rock combined body. J Rock Soil Mech 41(6):1–13
Jiao XF, Zhang WJ, Kang TH (2012) Meso simulation of formation and development of rock shear zone and its failure mechanism. J Coal Eng 2:104–107
Kulhawy FH (1975) Stress deformation properties of rock and rock discontinuities. J Eng Geol 9(4):327–350
Lan YW, Zhang GH, Liu HL et al (2018) Mechanical characteristics underlying coal and rock combinations under different combination conditions. J Heilongjiang Univ Sci Technol 28(2):136–141
Liu XS, Tan YL, Ning JG et al (2018) Mechanical properties and damage constitutive model of coal in coal–rock combined body. Int J Rock Mech Min Sci 110:140–150
Miao LG, Niu YY, Shi BM (2019) Impact dynamic tests for rock–coal–rock combination under different strain rates. J Vib Shock 38(17):137–143
Mu ZL, Wang H, Peng P et al (2013) Experimental research on failure characteristics and bursting liability of rock–coal–rock sample. J Min Saf Eng 30(6):841–847
Nie X, Zhou AC (2018) Numerical analysis on mechanical characteristics of coal–rock combination of different height ratios. J Coal Technol 37(3):102–104
Song HQ, Zuo JP, Chen Y et al (2018) Post-peak stress-strain relationship model and brittle characteristics of coal–rock combined body. J Min Saf Eng 35(5):1063–1070
Tang CN, Xu XH (1991) The whole process of rock fracture and the whole sequence of seismogenesis. J Acta Seismol Sin 13(4):517–522
Yang L, Gao FQ, Wang XQ et al (2019) Study on energy evolution law and failure mechanism of coal–rock combined specimen. J China Coal Soc. https://doi.org/10.13225/j.cnki.jccs.2019.0011
Yu WJ, Pan B, Zhang F et al (2019a) Deformation characteristics and determination of optimum supporting time of alteration rock mass in deep mine. J Civ Eng 23(11):4921–4932
Yu WJ, Wu GS, Liu Z et al (2019b) Experimental study on uneven failure of loose coal and rock composite specimen. J Coal Sci Technol 47(1):85–90
Yu WJ, Wu GS, Liu Z et al (2020) Uniaxial compression test of coal–rock–bolt anchorage body and mechanical mechanisms of bolts. Chin J Rock Mech Eng 39(1):57–68
Zhou CY, Liu CX, Ma DP et al (2019) Analysis of strength and acoustic emission characteristics of coal and rock mass in different combinations. J Saf Coal Mines 50(2):232–236
Zuo JP, Chen Y, Zhang JW et al (2016) Failure behavior and strength characteristics of coal–rock combined body under different con- fining pressures. J China Coal Soc 41(11):2706–2713
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51974117), Hunan Provincial Natural Science Foundation of China (No. 2020JJ4027) and Graduate Research and Innovation Projects of Hunan Province (CN) (CX2018b662) and is gratefully acknowledged. In addition, we would like to thank the anonymous reviewers who have helped to improve the paper.
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Pan, B., Yu, W. & Shen, W. Experimental Study on Energy Evolution and Failure Characteristics of Rock–Coal–Rock Combination with Different Height Ratios. Geotech Geol Eng 39, 425–435 (2021). https://doi.org/10.1007/s10706-020-01501-4
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DOI: https://doi.org/10.1007/s10706-020-01501-4