Geomechanics and Engineering

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Microseismic monitoring and its precursory parameter of hard roof collapse in longwall faces: A case study

  • Wang, Jun (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) ;
  • Ning, Jianguo (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) ;
  • Qiu, Pengqi (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) ;
  • Yang, Shang (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) ;
  • Shang, Hefu (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)
  • Received : 2018.08.18
  • Accepted : 2019.03.04
  • Published : 2019.03.20
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Abstract

In underground retreating longwall coal mining, hard roof collapse is one of the most challenging safety problems for mined-out areas. Identifying precursors for hard roof collapse is of great importance for the development of warning systems related to collapse geohazards and ground control. In this case study, the Xinhe mine was chosen because it is a standard mine and the minable coal seam usually lies beneath hard strata. Real-time monitoring of hard roof collapse was performed in longwall face 5301 of the Xinhe mine using support resistance and microseismic (MS) monitoring; five hard roof collapse cases were identified. To reveal the characteristics of MS activity during hard roof collapse development and to identify its precursors, the change in MS parameters, such as MS event rate, energy release, bursting strain energy, b value and the relationships with hard roof collapse, were studied. This research indicates that some MS parameters showed irregularity before hard roof collapse. For the Xinhe coalmine, a substantial decrease in b value and a rapid increase in MS event rate were reliable hard roof collapse precursors. It is suggested that the b value has the highest predictive sensitivity, and the MS event rate has the second highest.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Natural Science Foundation of Shandong Province

References

  1. Cao, A.Y., Dou, L.M., Wang, C.B., Yao, X.X., Dong, J.Y. and Gu, Y. (2016), "Microseismic precursory characteristics of rock burst hazard in mining areas near a large residual coal pillar: A case study from Xuzhuang coal mine, Xuzhou, China", Rock Mech. Rock Eng., 49(11), 1-16. https://doi.org/10.1007/s00603-015-0901-0
  2. Dai, F., Li, B., Xu, N. Fan, Y.L. and Zhang, C.Q. (2016), "Deformation forecasting and stability analysis of large-scale underground powerhouse caverns from microseismic monitoring", Int. J. Rock Mech. Min. Sci., 86, 269-281. https://doi.org/10.1016/j.ijrmms.2016.05.001
  3. Diederichs, M.S. and Kaiser, P.K. (1999), "Stability of large excavations in laminated hard rock masses: the voussoir analogue revisited", Int. J. Rock Mech. Min. Sci., 36(1), 97-117. https://doi.org/10.1016/S0148-9062(98)00180-6
  4. Dyke, M.A.V, Su, W.H. and Wickline, J. (2018), "Evaluation of seismic potential in a longwall mine with massive sandstone roof under deep overburden", Int. J. Min. Technol., 28(1), 115-119. https://doi.org/10.1016/j.ijmst.2017.12.014
  5. Gao, F., Stead, D. and Kang, H. (2014), "Simulation of roof shear failure in coal mine roadways using an innovative UDEC Trigon approach", Comput. Geotech., 61(3), 33-41. https://doi.org/10.1016/j.compgeo.2014.04.009
  6. Gholizadeh, S., Leman, Z. and Baharudin, B.T.H.T. (2015), "A review of the application of acoustic emission technique in engineering", Struct. Eng. Mech., 54(6), 1075-1095. https://doi.org/10.12989/sem.2015.54.6.1075
  7. Ghosh, G.K. and Sivakumar, C. (2018), "Application of underground microseismic monitoring for ground failure and secure longwall coal mining operation: A case study in an Indian mine", J. Appl. Geophys., 150, 21-39. https://doi.org/10.1016/j.jappgeo.2018.01.004
  8. Guo, H., Yuan, L., Shen, B.T., Qu, Q.D. and Xue, J.H. (2012), "Mining-induced strata stress changes, fractures and gas flow dynamics in multi-seam longwall mining", Int. J. Min. Technol., 54, 129-139.
  9. Guo, W.Y., Tan, Y.L., Yu, F.H., Zhao, T.B., Hu, S.C., Huang, D.M. and Qin, Z.W. (2018), "Mechanical behavior of rock-coal-rock specimens with different coal thicknesses", Geomech. Eng., 15(4), 1017-1027. https://doi.org/10.12989/GAE.2018.15.4.1017
  10. Gutenberg, B. and Richter, C.F., (1944), "Frequency of earthquakes in California", B. Seismol. Soc. Am., 34(4), 185-188. https://doi.org/10.1785/BSSA0340040185
  11. Hosseini, N. (2017), "Evaluation of the rockburst potential in longwall coal mining using passive seismic velocity tomography and image subtraction technique", J. Seismol., 21(1), 1-10. https://doi.org/10.1007/s10950-016-9620-6
  12. Huang, W.P., Li, C., Zhang, L.W., Yuan, Q., Zheng, Y.S. and Liu, Y. (2018), "In situ identification of water-permeable fractured zone in overlying composite strata", Int. J. Rock Mech. Min. Sci., 105, 85-97. https://doi.org/10.1016/j.ijrmms.2018.03.013
  13. Iannacchione, A.T, Esterhuizen, G.S, Swansonm P.L., Swanson P.L. and Chapman M.C. (2005) "Characteristics of mininginduced seismicity associated with roof falls and roof caving events", Proceedings of the 40th US Rock Mechanics Symposium, Anchorage, Alaska, U.S.A., January
  14. Islam, M.R., Hayashi, D. and Kamruzzaman, A.B.M. (2009), "Finite element modeling of stress distributions and problems for multi-slice longwall mining in Bangladesh, with special reference to the Barapukuria coal mine", Int. J. Coal. Geol., 78(2), 91-109. https://doi.org/10.1016/j.coal.2008.10.006
  15. Jiang, L., Zhang, P., Chen, L., Hao, Z., Sainoki, A., Mitri, H.S. and Wang, Q.B. (2017), "Numerical approach for goaf-side entry layout and yield pillar design in fractured ground conditions", Rock. Mech. Rock. Eng., 345(10), 690-705
  16. Jiang, L.S, Kong, P., Shu, J.M. and Fan, K.G. (2019), "Numerical analysis of support designs based on a case study of a longwall entry", Rock Mech. Rock Eng., 1-12.
  17. Kang, H.P., Lou, J.F., Gao, F.Q., Yang, J.H. and Li, J.Z. (2018), "A physical and numerical investigation of sudden massive roof collapse during longwall coal retreat mining", Int. J. Coal Geol., 188, 25-36. https://doi.org/10.1016/j.coal.2018.01.013
  18. Leake, M.R., Conrad, W.J., Westman, E.C., Afrou, S.G. and Molka, R.J. (2017), "Microseismic monitoring and analysis of induced seismicity source mechanisms in a retreating room and pillar coal mine in the Eastern United States", Undergr. Sp., 2(2), 115-124. https://doi.org/10.1016/j.undsp.2017.05.002
  19. Li, Y., Yang, T.H., Liu, H.L. Wang, H., Hou, X.G., Zhang, P.H. and Wang, P.T. (2016), "Real-time microseismic monitoring and its characteristic analysis in working face with high-intensity mining", J. Appl. Geophys., 132, 152-163. https://doi.org/10.1016/j.jappgeo.2016.07.010
  20. Liu, X.S., Tan, Y.L., Ning, J.G., Lu, Y.W. and Gu, Q.H. (2018), "Mechanical properties and damage constitutive model of coal in coal-rock combined body", Int. J. Rock Mech. Min. Sci., 110, 140-150. https://doi.org/10.1016/j.ijrmms.2018.07.020
  21. Lu, C.P., Liu, Y., Wang, H.Y. and Liu, P.F. (2016), "Microseismic signals of double-layer hard and thick igneous strata separation and fracturing", Int. J. Coal Geol., 160, 28-41. https://doi.org/10.1016/j.coal.2016.04.011
  22. Mahdevari, S., Shahriar, K., Sharifzadeh, M. and Tannant, D.D. (2016), "Assessment of failure mechanisms in deep longwall faces based on mining-induced seismicity", Arab. J. Geosci., 9(18), 709. https://doi.org/10.1007/s12517-016-2743-9
  23. Mohammadi S., Ataei M. and Kakaie R. (2018), "Assessment of the importance of parameters affecting roof strata cavability in mechanized longwall mining", Geotech. Geol. Eng., 36(4), 2667-2682. https://doi.org/10.1007/s10706-018-0490-2
  24. Mondal, D., Roy, P.N.S. and Behera, P.K. (2017), "Use of correlation fractal dimension signatures for understanding the overlying strata dynamics in longwall coal mines" Int. J. Rock Mech. Min. Sci., 91, 210-221. https://doi.org/10.1016/j.ijrmms.2016.11.019
  25. Ning, J.G., Wang, J., Jiang, J.Q., Hu, S.C., Jiang, L.S. and Liu, X.S. (2018), "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. https://doi.org/10.1007/s00603-017-1317-9
  26. Ning, J.G., Wang, J., Jiang, L.S., Jiang, N., Liu, X.S. and Jiang, J.Q. (2017b) "Fracture analysis of double-layer hard and thick roof and the controlling effect on strata behavior: A case study", Eng. Fail. Anal., 81, 117-134. https://doi.org/10.1016/j.engfailanal.2017.07.029
  27. Ning, J.G., Wang, J., Tan, Y.L., Zhang, L.S. and Bu, T.T. (2017a), "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
  28. Paul, P.S. (2016), "Rock mechanical investigation of strata loading characteristics to assess caving and requirement of support resistance in a mechanized powered support longwall face", Int. J. Min. Technol., 26(6), 1081-1087. https://doi.org/10.1016/j.ijmst.2016.09.017
  29. Peng, S.S. (1987), "Support capacity and roof behaviour at longwall faces with shield supports", Int. J. Min. Geol. Eng., 5(1), 29-57. https://doi.org/10.1007/BF01553531
  30. Peng, S.S. (2013), Coal Mine Ground Control, China University of Mining and Technology Press, Xuzhou, China.
  31. Shen, B., King, A. and Guo, H. (2008), "Displacement, stress and seismicity in roadway roofs during mining-induced failure", Int. J. Rock Mech. Min. Sci., 45(5), 672-688. https://doi.org/10.1016/j.ijrmms.2007.08.011
  32. Singh, G.S.P. (2015), "Conventional approaches for assessment of caving behaviour and support requirement with regard to strata control experiences in longwall workings", J. Rock Mech. Geotech. Eng., 7(3), 291-297. https://doi.org/10.1016/j.jrmge.2014.08.002
  33. Szwedzicki, T. (2001), "Geotechnical precursors to large-scale ground collapse in mines", Int. J. Rock Mech. Min. Sci., 38(7), 957-965. https://doi.org/10.1016/S1365-1609(01)00062-4
  34. Tien, D.L., Oh, J., Hebblewhite, B., Zhang, C.G. and Mitra, R. (2018), "A discontinuum modelling approach for investigation of longwall top coal caving mechanisms", Int. J. Rock Mech. Min. Sci., 108, 84-95.
  35. Utsu, T., Ogata, Y. and Ritsuko, S. (1995), "The centenary of the omori formula for a decay law of aftershock activity", J. Phys. Earth, 43(1), 1-33. https://doi.org/10.4294/jpe1952.43.1
  36. Wang, J., Ning, J., Jiang, L.S., Jiang, J.Q. and Bu, T.T. (2018), "Structural characteristics of strata overlying of a fully mechanized longwall face: A case study", J. S. Afr. Inst. Min. Metall., 118(11), 1195-1204
  37. Wang, J., Ning, J.G., Jiang, L.S., Gu, Q.H., Xu, Q.H. and Jiang, J.Q. (2017), "Effects of main roof fracturing on energy evolution during the extraction of thick coal seems in deep longwall faces", Acta Geodyn. Geomater., 14(43), 377-387.
  38. Yin, Y.C., Zhao, T.B., Zhang, Y.B., Tan, Y.L., Qiu, Y., Taheri, A. and Jing, Y. (2019), "An innovative method for placement of gangue backfilling material in steep underground coal mines", Minerals, 9(2), 107. https://doi.org/10.3390/min9020107
  39. Yin, Y.C., Zou, J.C., Zhang, Y.B., Qiu, Y., Fang, K. and Huang, D.M. (2018), "Experimental study of the movement of backfilling gangues for goaf in steeply inclined coal seams", Arab. J. Geosci., 11(12), 318. https://doi.org/10.1007/s12517-018-3686-0
  40. Zhang, C., Li, X.B., Dong, L.J., Ma J. and Huang, L.Q. (2016), "Analysis of microseismic activity parameters pre- and post roof caving and early warning", Chin. J. Rock Mech. Eng., 35(s1), 3214-3221.
  41. 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
  42. Zhang, P., Yang, T., Yu, Q., Xu, T., Zhu, W.C., Liu, H.L., Zhou, J.R. and Zhao, Y.C. (2015), "Microseismicity induced by fault activation during the fracture process of a crown pillar", Rock Mech. Rock Eng., 48(4), 1673-1682. https://doi.org/10.1007/s00603-014-0659-9

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