Geomechanics and Engineering

  • 제15권4호
  • /
  • Pages.1017-1027
  • /
  • 2018
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Mechanical behavior of rock-coal-rock specimens with different coal thicknesses

  • Guo, Wei-Yao (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Tan, Yun-Liang (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Yu, Feng-Hai (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Zhao, Tong-Bin (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Hu, Shan-Chao (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Huang, Dong-Mei (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Qin, Zhe (National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and Technology)
  • 투고 : 2017.02.28
  • 심사 : 2018.01.26
  • 발행 : 2018.07.20
⟨ 이전 논문 다음 논문 ⟩

초록

To explore the influence of coal thickness on the mechanical behavior and the failure characteristics of rock-coal-rock (RCR) mass, the experimental investigation of uniaxial compressive tests was conducted first and then a systematic numerical simulation by particle flow code (PFC2D) was performed to deeply analyze the failure mechanical behavior of RCR specimens with different coal thicknesses in conventional compression tests. The overall elastic modulus and peak stress of RCR specimens lie between the rock and the coal. Inter-particle properties were calibrated to match the physical sample strength and the stiffness response. Numerical simulation results show that the deformation and strength behaviors of RCR specimens depend not only on the coal thickness, but also on the confining pressure. Under low confining pressures, the overall failure mechanism of RCR specimen is the serious damage of coal section when the coal thickness is smaller than 30 mm, but it is shear failure of coal section when the coal thickness is larger than 30 mm. Whereas under high confining pressures, obvious shear bands exist in both the coal section and the rock section when the coal thickness is larger than 30 mm, but when the coal thickness is smaller than 30mm, the failure mechanism is serious damage of coal section and shear failure of rock section.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. Bukowska, M. (2013), "Post-peak failure modulus in problems of mining geo-mechanics", J. Min. Sci., 49(5), 731-740. https://doi.org/10.1134/S1062739149050067
  2. Chen, M., Yang, S.Q., Zhang, Y.C. and Zang, C.W. (2016), "Analysis of the failure mechanism and support technology for the Dongtan deep coal roadway", Geomech. Eng., 11(3), 401-420. https://doi.org/10.12989/gae.2016.11.3.401
  3. Chen, X., Liao, Z.H. and Peng, X. (2012), "Deformability characteristics of jointed rock masses under uniaxial compression", Int. J. Min. Sci. Technol., 22(2), 213-221. https://doi.org/10.1016/j.ijmst.2011.08.012
  4. Duncan, J.M. (2000), "Factors of safety and reliability in geotechnical engineering", J. Geotech. Geoenviron. Eng., 126(4), 307-316. https://doi.org/10.1061/(ASCE)1090-0241(2000)126:4(307)
  5. Gale, W.J. (1998), "Coal pillar design issues in longwall mining", Ph.D. Dissertation, University of Wollongong and The Australasian Institute of Mining and Metallurgy, Wollongong, Australia.
  6. Guo, D.M., Zuo, J.P., Zhang, Y. and Yang, R.S. (2011), "Research on strength and failure mechanism of deep coal-rock combination bodies of different inclined angles", Rock Soil Mech., 32(5), 1333-1339 (in Chinese).
  7. Guo, W.Y., Tan, Y.L., Yang, Z.L., Zhao, T.B. and Hu, S.C. (2017b), "Effect of saturation time on the bursting liability indexes of coal and its application for rock burst mitigation", Geotech. Geol. Eng., 36(1), 589-597.
  8. Guo, W.Y., Zhao, T.B., Tan, Y.L., Yu, F.H., Hu, S.C. and Yang, F.Q. (2017a), "Progressive mitigation method of rock bursts under complicated geological conditions", Int. J. Rock Mech. Min. Sci., 96, 11-22. https://doi.org/10.1016/j.ijrmms.2017.04.011
  9. He, X.Q., Chen, W.X., Nie, B.S. and Mitri, H.N. (2011), "Electromagnetic emission theory and its application to dynamic phenomena in coal-rock", Int. J. Rock Mech. Min. Sci., 48(8), 1352-1358. https://doi.org/10.1016/j.ijrmms.2011.09.004
  10. Huang, B.X. and Liu, J.W. (2013), "The effect of loading rate on the behavior of samples composed of coal and rock", Int. J. Rock Mech. Min. Sci., 61(10), 23-30. https://doi.org/10.1016/j.ijrmms.2013.02.002
  11. Huang, W.P., Yuan, Q., Tan, Y.L., Wang, J., Liu, G.L., Qu, G.L. and Li, C. (2017), "An innovative support technology employing a concrete-filled steel tubular structure for a 1000-mdeep roadway in a high in situ stress field", Tunn. Undergr. Sp. Technol., 73, 26-36.
  12. Kaiser, P.K. and Cai, M. (2012), "Design of rock support system under rockburst condition", J. Rock Mech. Geotech. Eng., 4(3), 215-227. https://doi.org/10.3724/SP.J.1235.2012.00215
  13. Lin, H. and Chen, J.Y. (2017), "Back analysis method of homogeneous slope at critical state", KSCE J. Civ. Eng., 21(3), 670-675. https://doi.org/10.1007/s12205-016-0400-1
  14. Lin, H., Zhong, W.W. and Cao, P. (2016), "Three-dimensional rock slope stability analysis considering the surface load distribution", Eur. J. Environ. Civ. Eng., 20(8), 877-898. https://doi.org/10.1080/19648189.2015.1084382
  15. Liu, C.L., Tan, Z.X., Deng, K.Z. and Li, P.X. (2013), "Synergistic instability of coal pillar and roof system and filling method based on plate model", Int. J. Min. Sci. Technol., 23(1), 145-149. https://doi.org/10.1016/j.ijmst.2013.03.005
  16. Lu, C.P., Liu, G.J., Liu, Y., Zhang, N., Xue, J.H. and Zhang, L. (2015), "Microseismic multi-parameter characteristics of rockburst hazard induced by hard roof fall and high stress concentration", Int. J. Rock Mech. Min. Sci., 76, 18-32. https://doi.org/10.1016/j.ijrmms.2015.02.005
  17. Meng, F.Z., Zhou, H., Zhang, C.Q., Xu, R.C. and Lu, J.J. (2015), "Evaluation methodology of brittleness of rock based on postpeak stress-strain curves", Rock Mech. Rock Eng., 48(5), 1787-1805. https://doi.org/10.1007/s00603-014-0694-6
  18. Newman, D.A. (2002), "A case history investigation of two coal bumps in the southern appalachian coalfield", Proceedings of the 21st International Conference on Ground Control in Mining, Morgantown, West Virginia, U.S.A.
  19. Ning, J.G., Wang, J., Jiang, J.Q., Hu, S.C., Jiang, L.S. and Liu, X.S. (2017), "Estimation of crack initiation and propagation thresholds of confined brittle coal specimens based on energy dissipation theory", Rock Mech. Rock Eng., 51(1), 119-134.
  20. Panaghi, K., Golshani, A. and Takemura, T. (2015), "Rock failure assessment based on crack density and anisotropy index variations during triaxial loading tests", Geomech. Eng., 9(6), 793-813. https://doi.org/10.12989/gae.2015.9.6.793
  21. Potyondy, D.O. and Cundall, P.A. (2004), "A bonded-particle model for rock", Int. J. Rock Mech. Min. Sci., 41(8), 1329-1364. https://doi.org/10.1016/j.ijrmms.2004.09.011
  22. Poulsen, B.A., Shen, B., Williams, D.J., Huddlestone-Holmes, C., Erarslan, N. and Qin, J. (2014), "Strength reduction on saturation of coal and coal measures rocks with implications for coal pillar strength", Int. J. Rock Mech. Min. Sci., 71, 41-52. https://doi.org/10.1016/j.ijrmms.2014.06.012
  23. Rodriguez, R. and Lombardia, C. (2010), "Analysis of methane emissions in a tunnel excavated through Carboniferous strata based on underground coal mining experience", Tunn. Undergr. Sp. Technol., 25(4), 456-468. https://doi.org/10.1016/j.tust.2010.02.010
  24. Sherizadeh, T. and Kulatilake, P.H. (2016), "Assessment of roof stability in a room and pillar coal mine in the U.S. using threedimensional distinct element method", Tunn. Undergr. Sp. Technol., 59, 24-37. https://doi.org/10.1016/j.tust.2016.06.005
  25. Song, D.Z., Wang, E.Y., Xu, J.K., Liu, X.F., Shen, R.X. and Xu, W.Q. (2015), "Numerical simulation of pressure relief in hard coal seam by water jet cutting", Geomech. Eng., 8(4), 495-510. https://doi.org/10.12989/gae.2015.8.4.495
  26. Takeuchi, A., Lau, W.S. and Freund, F.T. (2006), "Current and surface potential induced by stress-activated positive holes in igneous rocks", Phys. Chem. Earth, 31(4-9), 240-247. https://doi.org/10.1016/j.pce.2006.02.022
  27. Tan, Y.L., Guo, W.Y., Gu, Q.H., Zhao, T.B., Yu, F.H., Hu, S.C. and Yin, Y.C. (2016), "Research on the rockburst tendency and AE characteristics of inhomogeneous coal-rock combination bodies", Shock Vib., (2), 1-11.
  28. Tan, Y.L., Liu, X.S., Ning, J.G. and Lu, Y.W. (2017), "In situ investigations on failure development of overlying strata induced by mining multiple coalseams", Geotech. Test. J., 40(2), 244-257.
  29. Tan, Y.L., Yu, F.H., Ning, J.G. and Zhao, T.B. (2015), "Design and construction of entry retaining wall along a gob side under hard roof stratum", Int. J. Rock Mech. Min. Sci., 77, 115-121. https://doi.org/10.1016/j.ijrmms.2015.03.025
  30. Vakili, A. and Hebblewhite, B.K. (2010), "A new cavability assessment criterion for longwall top coal caving", Int. J. Rock Mech. Min. Sci., 47(8), 1317-1329. https://doi.org/10.1016/j.ijrmms.2010.08.010
  31. Wang, G., Pan, Y.S., Xiao, X.C., Wu, D., Ding, X. and Zhao, X. (2016) "Experimental study on charge law of coal-rock bodies rock burst tendency and failure characteristics", Chin. Safety Sci. J., 26(7), 135-140 (in Chinese).
  32. Wang, T., Jiang, Y.D., Zhan, S.L. and Wang, C. (2014), "Frictional sliding tests on combined coal-rock samples", J. Rock Mech. Geotech. Eng., 6(3), 280-286. https://doi.org/10.1016/j.jrmge.2014.03.007
  33. Zhang, G.C., Liang, S.J., Tan, Y.L., Xie, F.X., Chen, S.J. and Jia, H.G. (2018) "Numerical modeling for longwall pillar design: A case study from a typical longwall panel in China", J. Geophys. Eng., 15(1), 121-134. https://doi.org/10.1088/1742-2140/aa9ca4
  34. Zhang, X.P. and Wong, L.N.Y. (2013), "Loading rate effects on cracking behavior of flaw-contained specimens under uniaxial compression", Int. J. Fracture, 180(1), 93-110. https://doi.org/10.1007/s10704-012-9803-2
  35. Zhang, X.P., Jiang, Y.J., Wang, G., Wang, J.C., Wu, X.Z. and Zhang, Y.Z. (2016), "Numerical experiments on rate-dependent behaviors of granite based on particle discrete element model", Rock Soil Mech., 37(9), 2679-2685.
  36. Zhang, Z.T., Liu, J.F., Wang, L., Yang, H.T. and Zuo, J.P. (2012), "Effects of combination mode on mechanical properties and failure characteristics of the coal-rock combinations", J. Chin. Coal Soc., 37(10), 1677-1681 (in Chinese).
  37. Zhao, T.B., Guo, W.Y., Lu, C.P. and Zhao, G.M. (2016), "Failure characteristics of combined coal-rock with different interfacial angles", Geomech. Eng., 11(3), 345-359. https://doi.org/10.12989/gae.2016.11.3.345
  38. Zhao, T.B., Guo, W.Y., Tan, Y.L., Lu, C.P. and Wang, C.W. (2017a), "Case histories of rock bursts under complicated geological conditions", Bull. Eng. Geol. Environ., 1-17.
  39. Zhao, T.B., Guo, W.Y., Tan, Y.L., Yin, Y.C., Cai, L.S. and Pan, J.F. (2018), "Case studies of rock bursts under complicated geological conditions during multi-seam mining at a depth of 800 m", Rock Mech. Rock Eng., 51(5), 1539-1564. https://doi.org/10.1007/s00603-018-1411-7
  40. Zhao, T.B., Guo, W.Y., Tan, Y.L., Yu, F.H., Huang, B. and Zhang, L.S. (2017b), "Failure mechanism of layer-crack rock models with different vertical fissure geometric configurations under uniaxial compression", Adv. Mech. Eng., 9(11), 1-15.
  41. Zhao, W.H., Huang, R.Q. and Yan, M. (2015b), "Mechanical and fracture behavior of rock mass with parallel concentrated joints with different dip angle and number based on PFC simulation", Geomech. Eng., 8(6), 757-767. https://doi.org/10.12989/gae.2015.8.6.757
  42. Zhao, Z.H., Wang, W.M., Wang, L.H. and Dai, C.Q. (2015a), "Compressive-shear strength criterion of coal-rock combination model considering interface effect", Tunn. Undergr. Sp. Technol., 47, 193-199. https://doi.org/10.1016/j.tust.2015.01.007
  43. Zuo, J.P., Wang, Z.F., Zhou, H.W., Pei, J.L. and Liu, J.F. (2013), "Failure behavior of a RCR combined body with a weak coal interlayer", Int. J. Min. Sci. Technol., 23(6), 907-912. https://doi.org/10.1016/j.ijmst.2013.11.005
  44. Zuo, J.P., Xie, H.P., Wu, A.M. and Liu, J.F. (2011), "Investigation on failure mechanisms and mechanical behaviors of deep coalrock single body and combined body", Chin. J. Rock Mech. Eng., 30(1), 84-92 (in Chinese).

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