Geomechanics and Engineering

  • 제28권6호
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  • Pages.613-624
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Study on the water bursting law and spatial distribution of fractures of mining overlying strata in weakly cemented strata in West China

  • Li, Yangyang (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining) ;
  • Zhang, Shichuan (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining) ;
  • Yang, Yingming (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining) ;
  • Chen, Hairui (Shaanxi Zhengtong Coal Industry Co., Ltd) ;
  • Li, Zongkai (Lin Yi. Shandong Energy Mining Group Co., Ltd) ;
  • Ma, Qiang (Lin Yi. Shandong Energy Mining Group Co., Ltd)
  • 투고 : 2021.06.01
  • 심사 : 2021.09.27
  • 발행 : 2022.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

A study of the evolution of overburden fractures under the solid-fluid coupling state was conducted based on the geological and mining characteristics of the coal seam depth, weak strata cementation, and high-intensity mining in the mining areas of West China. These mining characteristics are key to achieving water conservation during mining or establishing groundwater reservoirs in coal mines. Based on the engineering background of the Daliuta Coal Mine, a non-hydrophilic simulation material suitable for simulating the weakly cemented rock masses in this area was developed, and a physical simulation test was carried out using a water-sand gushing test system. The study explored the spatial distribution and dynamic evolution of the fractured zone in the mining overburden under the coupling of stress and seepage. The experimental results show that the mining overburden can be vertically divided into the overall migration zone, the fracture extension zone and the collapse zone; additionally, in the horizontal direction, the mining overburden can be divided into the primary fracture zone, periodic fracture zone, and stop-fracture zone. The scope of groundwater flow in the overburden gradually expands with the mining of coal seams. When a stable water inrush channel is formed, other areas no longer generate new channels, and the unstable water inrush channels gradually close. Finally, the primary fracture area becomes the main water inrush channel for coal mines. The numerical simulation results indicate that the overlying rock breaking above the middle of the mined-out area allows the formation of the water-conducting channel. The water body will flow into the fracture extension zone with the shortest path, resulting in the occurrence of water bursting accidents in the mining face. The experimental research results provide a theoretical basis for the implementation of water conservation mining or the establishment of groundwater reservoirs in western mining areas, and this theoretical basis has considerable application and promotion value.

키워드

과제정보

This research was financially supported by the Open Fund of State Key Laboratory of Water Resource Protection and Utilization in Coal Mining (SHJT-17-42.14), National Natural Science Foundation of China (52004147, 51974173), Natural Science Foundation of Shandong Province (ZR2020QE129).

참고문헌

  1. Annaidh, A.N., Destrade, M., Gilchrist, M.D. and Murphy, J.G. (2013), "Deficiencies in numerical models of anisotropic nonlinearly elastic materials", Biomecha. Model. Mechanobiology, 12(4), 781-791. https://doi.org/10.1007/s10237-012-0442-3.
  2. Bai, M. and Elsworth, D. (1990), "Some aspects of mining under aquifers in China", Min. Sci. a Tech., 10(1), 81-91. https://doi.org/10.1016/0167-9031(90)90878-V.
  3. Bruce, H. (2020), "Fracturing, caving propagation and influence of mining on groundwater above longwall panels - a review of predictive models", Int. J. Min. Sci. Technolo., 30(1), 49-54. https://doi.org/10.1016/j.ijmst.2019.12.001.
  4. Chen, S.J., Yin, D., Jiang, N., Wang, F. and Guo, W. (2019), "Simulation study on effects of loading rate on uniaxial compression failure of composite rock-coal layer", Geomech. Eng., 17(4), 333-342. https://doi.org/10.12989/gae.2019.17.4.333.
  5. Cheng, G., Ma, T., Tang, C., Liu, H. and Wang, S. (2017), "A zoning model for coal mining-induced strata movement based on microseismic monitoring", Int. J. Rock Mech. Min. Sci., 94, 123-138. https://doi.org/10.1016/j.ijrmms.2017.03.001.
  6. Hu, Z., Chen, C., Xiao, W. and Xinjing, W. (2016), "Surface movement and deformation characteristics due to high-intensive coal mining in the windy and sandy region", Int. J. Coal Sci. Technol., 3(3), 339-348. https://doi.org/10.1007/s40789-016-0144-z.
  7. Khorasani, E., Amini, M., Hossaini, M.F. and Medley, E. (2019), "Evaluating the effects of the inclinations of rock blocks on the stability of bimrock slopes", Geomech. Eng., 17(3), 281-287. https://doi.org/10.12989/gae.2019.17.3.281.
  8. Komurlu, E. and Kesimal, A. (2015), "Sulfide-rich mine tailings usage for short-term support purposes: an experimental study on paste backfill barricades", Geomech. Eng., 9(2), 195-205. https://doi.org/10.12989/gae.2015.9.2.195
  9. Kratzsch, H. (1983), Mining Subsidence Engineering. Springer-Verlag, Berlin Heidelberg.
  10. Li, L.P., Chen, D.Y., Li, S.C., Shi, S.S. and Liu, H.L. (2017), "Numerical analysis and fluid-solid coupling model test of filling-type fracture water inrush and mud gush", Geomech. Eng., 13(6), 1011-1025. https://doi.org/10.12989/gae.2017.13.6.1011.
  11. Liao, X., Wei, L. and Hou, J. (2013), "Application of GIS based ecological vulnerability evaluation in environmental impact assessment of master plan of coal mining area", Procedia Environ. Sci., 18, 271-276. https://doi.org/10.1016/j.proenv.2013.04.035.
  12. Lu, W., He, C. and Zhang, X. (2020), "Height of overburden fracture based on key strata theory in longwall face", PLoS ONE 15(1), e0228264. https://doi.org/10.1371/journal.pone.0228264.
  13. Lu, Y., Wang, C., Wang, W., Sun, C. and Zhang, B. (2018), "Height prediction of water flowing fractured zone and thickness effect of long wall caving in thick loose seam with weak cementation in 9th China-Russia symposium", Coal in the 21st Century: Mining, Intelligent Equipment and Environment Protection"(COAL 2018) Atlantis Press.
  14. Morrison, K.G., Reynolds, J.K. and Wright, A. (2019), "Subsidence fracturing of stream channel from longwall coal mining causing upwelling saline groundwater and metal-enriched contamination of surface waterway", Water Air Soil Pollut., 230,37(2019). https://doi.org/10.1007/s11270-019- 4082-4
  15. 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.
  16. Elsworth, Z.O. (1993), "Evaluation of groundwater flow into mined panels", Int. J. Rock Mech. Min. Sci. Geomech., 30(2), 71-79. https://doi.org/10.1016/0148-9062(93)90701-E.
  17. Peng, S.S., Ma, W.M. and Zhong, W.L. (1992), Surface subsidence engineering, Society for Mining, New York: SME.
  18. Schubert, J.P. (1980), "Fracture flow of groundwater in coal-bearing strata", United States: N. p. 1980. Web.
  19. Song, B., Zhang, S., Zhang, D., Fan, G., Yu, W. and Zhao, Q. (2018), "Inorganic cement grouting for reinforcing triangular zone of highly gassy coal face with large mining height", Energies, 11(10), 2549. https://doi.org/10.3390/en11102549.
  20. Sun, L., Ji H. and Yang B. (2019), "Physical and mechanical characteristic of rocks with weakly cemented strata in Western representative mining area", J. China Coal Soc., 44(3), 865-873. https://doi.org/10.13225j.cnki.jccs.2018.6039. https://doi.org/10.13225j.cnki.jccs.2018.6039
  21. Wang, C., Lu, Y., Li, Y., Zhang, B. and Liang, Y. (2019), "Deformation process and prediction of filling gangue: a case study in china", Geomech. Eng., 18(4), 417-426. https://doi.org/10.12989/gae.2019.18.4.417.
  22. Wang, C., Shen, B., Chen, J., Tong, W. and Li, Y. (2020), "Compression characteristics of filling gangue and simulation of mining with gangue backfilling: an experimental investigation", Geomech. Eng., 20(6), 485-495. https://doi.org/10.12989/gae.2020.20.6.485.
  23. Whittaker, B.N. and Reddish, D.J. (1989), Subsidence: Occurrence, Prediction and Control. Elsevier Science & Technology, Amsterdam.
  24. Zhang, G., Wang, H., Yan, S., Jia, C. and Song, X. (2020), "Simulated experiment of water-sand inrush across overlying strata fissures caused by mining", Geofluids, 2020(8), 1-11. https://doi.org/10.1155/2020/6614213.
  25. Zhang, S.C., 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 & the Environment 36(3), 1-9. https://doi.org/10.1007/s10230-017-0433-9.
  26. Zhang, Y., Tu, S., Bai, Q. and Li, J. (2013), "Overburden fracture evolution laws and water-controlling technologies in mining very thick coal seam under water-rich roof", Int. J. Min. Science Technol., 23(5), 693-700. https://doi.org/10.1016/j.ijmst.2013.08.013.