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Failure pattern of large-scale goaf collapse and a controlled roof caving method used in gypsum mine

  • Chen, Lu (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Zhou, Zilong (School of Resources and Safety Engineering, Central South University) ;
  • Zang, Chuanwei (School of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Zeng, Ling (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Zhao, Yuan (School of Resources and Safety Engineering, Central South University)
  • 투고 : 2018.04.06
  • 심사 : 2019.07.01
  • 발행 : 2019.07.20

초록

Physical model tests were first performed to investigate the failure pattern of multiple pillar-roof support system. It was observed in the physical model tests, pillars were design with the same mechanical parameters in model #1, cracking occurred simultaneously in panel pillars and the roof above barrier pillars. When pillars 2 to 5 lost bearing capacity, collapse of the roof supported by those pillars occurred. Physical model #2 was design with a relatively weaker pillar (pillar 3) among six pillars. It was found that the whole pillar-roof system was divided into two independent systems by a roof crack, and two pillars collapse and roof subsidence events occurred during the loading process, the first failure event was induced by the pillars failure, and the second was caused by the roof crack. Then, for a multiple pillar-roof support system, three types of failure patterns were analysed based on the condition of pillar and roof. It can be concluded that any failure of a bearing component would cause a subsidence event. However, the barrier pillar could bear the transferred load during the stress redistribution process, mitigating the propagation of collapse or cutting the roof to insulate the collapse area. Importantly, some effective methods were suggested to decrease the risk of catastrophic collapse, and the deep-hole-blasting was employed to improve the stability of the pillar and roof support system in a room and pillar mine.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. Bruhn, R.W., Magnuson, M.O. and Gray, R. (1978), "Subsidence over the mined-out Pittsburgh Coal", Proceedings of the Coal Mine Subsidence Session, American Society of Civil Engineers Spring Convention.
  2. Cording, E.J., Hashash, Y.M.A. and Oh, J. (2015), "Analysis of pillar stability of mined gas storage caverns in shale formations", Eng. Geol., 184, 71-80. https://doi.org/10.1016/j.enggeo.2014.11.001.
  3. Das, M.N. (1986), "Influence of width/height ratio on post-failure behaviour of coal", Int. J. Min. Geol. Eng., 4(1), 79-87. https://doi.org/10.1007/BF01553759.
  4. Esterhuizen, G.S., Dolinar, D.R. and Ellenberger, J.L. (2011), "Pillar strength in underground stone mines in the United States", Int. J. Rock Mech. Min. Sci., 48(1), 42-50. https://doi.org/10.1016/j.ijrmms.2010.06.003.
  5. Hauquin, T., Deck, O. and Gunzberger, Y. (2016), "Average vertical stress on irregular elastic pillars estimated by a function of the relative ratio", Int. J. Rock Mech. Min. Sci., 83, 122-134. https://doi.org/10.1016/j.ijrmms.2015.12.004.
  6. Hustrulid, W.A. (1976), "A review of coal pillar strength formulas", Rock Mech., 8(2), 115-145. https://doi.org/10.1007/BF01239762
  7. Jaiswal, A. and Shrivastva, B.K. (2009), "Numerical simulation of coal pillar strength", Int. J. Rock Mech. Min. Sci., 46(4), 779-788. https://doi.org/10.1016/j.ijrmms.2008.11.003.
  8. Li, S.C., Wang, D.C., Wang, Q., Wang, F.J., Peng, P., Li, W.T., Jiang, B. and Wang, H.T. (2013), "Development and application of large-scale geomechanical model test system for deep thick top coal roadway", J. Chin. Coal Soc., 38(9), 1522-1530.
  9. Li, X., Wu, Q., Tao, M., Weng, L., Dong, L. and Zou, Y. (2016), "Dynamic Brazilian splitting test of ring-shaped specimens with different hole diameters", Rock Mech. Rock Eng., 49(10), 4143- 4151. https://doi.org/10.1007/s00603-016-0995-z.
  10. Li, Y., Zhang, S. and Zhang, B. (2018a), "Dilatation characteristics of the coals with outburst proneness under cyclic loading conditions and the relevant applications", Geomech. Eng., 14(5), 459-466. https://doi.org/10.12989/gae.2018.14.5.459.
  11. Li, Y.Y., Zhang, S.C. and Zhang, X. (2018b), "Classification and fractal characteristics of coal rock fragments under uniaxial cyclic loading conditions", Arab. J. Geosci., 11(9), 201. https://doi.org/10.1007/s12517-018-3534-2.
  12. Lin, P., Liu, H.Y. and Zhou, W.Y. (2015), "Experimental study on failure behaviour of deep tunnels under high in-situ stresses", Tunn. Undergr. Sp. Techol., 46, 28-45. https://doi.org/10.1016/j.tust.2014.10.009.
  13. Lin, Q. and Labuz, J.F. (2013), "Fracture of sandstone characterized by digital image correlation", Int. J. Rock Mech. Min. Sci., 60, 235-245. https://doi.org/10.1016/j.ijrmms.2012.12.043.
  14. Liu, X.S., Ning, J.G., Tan, Y.L., Xu, Q. and Fan, D.Y. (2018), "Coordinated supporting method of gob-side entry retaining in coal mines and a case study with hard roof", Geomech. Eng., 15(6), 1173-1182. https://doi.org/10.12989/gae.2018.15.6.1173.
  15. Liu, Y.R., Guan, F.H., Yang, Q., Yang, R.Q. and Zhou, W.Y. (2013), "Geomechanical model test for stability analysis of high arch dam based on small blocks masonry technique", Int. J. Rock Mech. Min. Sci., 61, 231-243. https://doi.org/10.1016/j.ijrmms.2013.03.003.
  16. Ma, H.T., Wang, J.A. and Wang, Y.H. (2012), "Study on mechanics and domino effect of large-scale goaf cave-in", Saf. Sci., 50(4), 689-694. https://doi.org/10.1016/j.ssci.2011.08.050.
  17. Nikadat, N. and Marji, M.F. (2017), "Analysis of stress distribution around tunnels by hybridized FSM and DDM considering the influences of joints parameters", Geomech. Eng., 11(2), 269-288. https://doi.org/10.12989/gae.2016.11.2.269.
  18. Ning, J., Wang, J., Tan, Y., Zhang, L. and Bu, T. (2017), "In situ investigations into mining-induced overburden failures in close multiple-seam longwall mining: A case study", Geomech. Eng., 12(4), 657-673. https://doi.org/10.12989/gae.2017.12.4.657.
  19. Poulsen, B.A. (2010), "Coal pillar load calculation by pressure arch theory and near field extraction ratio", Int. J. Rock Mech. Min. Sci., 47(7), 1158-1165. https://doi.org/10.1016/j.ijrmms.2010.06.011.
  20. Poulsen, B.A. and Shen, B.T. (2013), "Subsidence risk assessment of decommissioned bord-and-pillar collieries", Int. J. Rock Mech. Min. Sci., 60, 312-320. https://doi.org/10.1016/j.ijrmms.2013.01.014.
  21. Ren, W., Guo, C., Peng, Z. and Wang, Y. (2010), "Model experimental research on deformation and subsidence characteristics of ground and wall rock due to mining under thick overlying terrane", Int. J. Rock Mech. Min. Sci., 47(4), 614-624. https://doi.org/10.1016/j.ijrmms.2009.12.012.
  22. Sahu, P. and Lokhande, R.D. (2015), "An investigation of sinkhole subsidence and its preventive measures in underground coal mining", Procedia Earth Planet Sci., 11, 63-75. https://doi.org/10.1016/j.proeps.2015.06.009.
  23. Wang, J.A., Shang, X.C. and Ma, H.T. (2008), "Investigation of catastrophic ground collapse in xintai gypsum mines in China", Int. J. Rock Mech. Min. Sci., 45(8), 1480-1499. https://doi.org/10.1016/j.ijrmms.2008.02.012.
  24. Wang, S.Y., Sloan, S.W. and Huang, M.L. (2011), "Numerical study of failure mechanism of serial and parallel rock pillars", Rock Mech. Rock Eng., 44, 179-198. https://doi.org/10.1007/s00603-010-0116-3.
  25. Wu, Q., Chen, L., Shen, B., Dlamini, B., Li, S. and Zhu, Y. (2019a), "Experimental investigation on rockbolt performance under the tension load", Rock Mech. Rock Eng., 1-14. https://doi.org/10.1007/s00603-019-01845-1.
  26. Wu, Q., Weng, L., Zhao, Y., Guo, B. and Luo, T. (2019b), "On the tensile mechanical characteristics of fine-grained granite after heating/cooling treatments with different cooling rates", Eng. Geol., 253, 94-110. https://doi.org/10.1016/j.enggeo.2019.03.014.
  27. Yang, D.W., Ma, Z.G., Qi, F.Z., Gong, P., Liu, D.P., Zhao, G.Z. and Zhang, R.R. (2017), "Optimization study on roof break direction of gob-side entry retaining by roof break and filling in thick-layer soft rock layer", Geomech. Eng., 13(2), 195-215. https://doi.org/10.12989/gae.2017.13.2.195.
  28. Yang, X.L. and Li, K.F. (2016b), "Roof collapse of shallow tunnel in layered Hoek-Brown rock media", Geomech. Eng., 11(6), 867-877. https://doi.org/10.12989/gae.2016.11.6.867.
  29. Yang, X.L., Xu, J.S., Li, Y.X. and Yan, R.M. (2016a), "Collapse mechanism of tunnel roof considering joined influences of nonlinearity and non-associated flow rule", Geomech. Eng., 10(1), 21-35. https://doi.org/10.12989/gae.2016.10.1.021.
  30. Zhang, J.H., Peng, J.H., Zeng, L., Li J. and Li F. (2019), "Rapid estimation of resilient modulus of subgrade soils using performance-related soil properties", Int. J. Pavement Eng., https://doi.org/10.1080/10298436.2019.1643022.
  31. Zhang, S., Guo, W., Li, Y., Sun, W. and Yin, D. (2017), "Experimental simulation of fault water inrush channel evolution in a coal mine floor", Mine Water Environ., 36, 1-9. https://doi.org/10.1007/s10230-017-0433-9.
  32. Zhang, W. and Goh, A.T.C. (2016), "Predictive models of ultimate and serviceability performances for underground twin caverns", Geomech. Eng., 10(2), 175-183. http://dx.doi.org/10.12989/gae.2016.10.2.175.
  33. Zhao, T.B., Guo, W.Y., Tan, Y.L., Lu, C.P. and Wang, C.W. (2018), "Case histories of rock bursts under complicated geological conditions", Bull. Eng. Geol. Environ., 77(4), 1529-1545. https://doi.org/10.1007/s10064-017-1014-7.
  34. 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, 1539-1564. https://doi.org/10.1007/s00603-018-1411-7.
  35. Zhou, Z., Cai, X., Ma, D., Chen, L., Wang, S. and Tan, L. (2018c), "Dynamic tensile properties of sandstone subjected to wetting and drying cycles", Constr. Build. Mater., 182, 215-232. https://doi.org/10.1016/j.conbuildmat.2018.06.056.
  36. Zhou, Z., Chen, L., Cai, X., Shen, B., Zhou, J. and Du, K. (2018a), "Experimental investigation of the progressive failure of multiple pillar-roof system", Rock Mech. Rock Eng., 51(5), 1629-1636. https://doi.org/10.1007/s00603-018-1441-1.
  37. Zhou, Z., Chen, L., Zhao, Y., Zhao, T., Cai, X. and Du, X. (2017), "Experimental and numerical investigation on the bearing and failure mechanism of multiple pillars under overburden", Rock Mech. Rock Eng., 50(4), 995-1010. https://doi.org/10.1007/s00603-016-1140-8.
  38. Zhou, Z., Zhao, Y., Cao, W., Chen, L. and Zhou, J. (2018b), "Dynamic response of pillar workings induced by sudden pillar recovery", Rock Mech. Rock Eng., 51(10), 3075-3090. https://doi.org/10.1007/s00603-018-1505-2.
  39. Zhu, W., Chen, L., Zhou, Z., Shen, B. and Xu, Y. (2018), "Failure propagation of pillars and roof in a room and pillar mine induced by longwall mining in the lower seam", Rock Mech. Rock Eng., 52(4), 1193-1209. https://doi.org/10.1007/s00603-018-1630-y.
  40. Zhu, W.S., Li, Y., Li, S.C., Wang, S.G. and Zhang, Q.B. (2011), "Quasi-three-dimensional physical model tests on a cavern complex under high in-situ stresses", Int. J. Rock Mech. Min. Sci., 48(2), 199-209. https://doi.org/10.1016/j.ijrmms.2010.11.008.

피인용 문헌

  1. Research on the Disintegration Characteristics of Carbonaceous Mudstone and Properties of Modified Materials vol.2019, 2019, https://doi.org/10.1155/2019/4382054
  2. Influencing Factors for the Instability and Collapse Mode of the Goaf Structure in a Gypsum Mine vol.2021, 2019, https://doi.org/10.1155/2021/5577287
  3. Dynamic stability analysis of rock tunnels subjected to impact loading with varying UCS vol.24, pp.6, 2019, https://doi.org/10.12989/gae.2021.24.6.505