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DOI QR Code

Force change of the gravel side support during gangue heaping under a new non-pillar-mining approach

  • Liu, Jianning (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology - Beijing) ;
  • He, Manchao (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology - Beijing) ;
  • Hou, Shilin (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology - Beijing) ;
  • Zhu, Zhen (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology - Beijing) ;
  • Wang, Yanjun (ShanXiYinFeng S&T CO., LTD) ;
  • Yang, Jun (State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology - Beijing)
  • 투고 : 2020.08.08
  • 심사 : 2021.09.28
  • 발행 : 2021.10.10

초록

The force change characteristics of gravel side support structures during gangue heaping can provide useful information about roadway stability in a new non-pillar-mining approach-noncoal pillar mining with automatically formed gob-side entry (NMAFG). Considering the dynamic shock and static stacking phenomena during gangue heaping, the coefficient of restitution and Janssen model are introduced into the theoretical analysis. Analytical results show that the impact force decreased with increasing gangue heaping height under dynamic shock, while under static stacking, the gangue extrusion force first increased sharply, then increased slowly and stabilized, and the final force was unrelated to the gangue heaping height. Field monitoring was conducted to verify the rationality of the pattern obtained from theoretical analysis. The gangue support structure lateral stress from field monitoring can be divided into two periods. In Period I, the peak value at the lower monitoring point was greater than that at any other point. The lowest sensor was subjected to the greatest impact, at 59.09 kN. In Period II, the stress value first rapidly increased, then slowly increased and stabilized. The final force was unrelated to the gangue height. The sensors at #2 (highest position), #4 (middle position), and #6 (lowest position) measured 31.91 kN, 44.82 kN and 38.19 kN, respectively. The analysis confirmed the variation characteristics of the impact force and extrusion force.

키워드

과제정보

This work is supported by the Foundation for the Opening of State Key Laboratory for Geomechanics & Deep Underground Engineering (SKLGDUEK2024), the National Key R&D Program (No. 2016YFC0600900), the National Natural Science Foundation of China (No. 51904207, 51674265) and China Scholarship Council (CSC NO. 202006430081), which are gratefully acknowledged.

참고문헌

  1. Asteriou, P. and Tsiambaos, G. (2018), "Effect of impact velocity, block mass and hardness on the coefficients of restitution for rockfall analysis", Int. J. Rock Mech. Min. Sci., 106, 41-50. https://doi.org/10.1016/j.ijrmms.2018.04.001.
  2. Nakajima, S., Abe, K., Shinoda, M., Abe, K., Shinoda, M., Nakamura, S. and Nakamura, H. (2020), "Experimental study on impact force due to collision of rockfall and sliding soil mass caused by seismic slope failure", Landslide, 18(1), 195-216. https://doi.org/10.1007/s10346-020-01461-z.
  3. Cisneros, L.A.T., Marzulli, V., Windows-Yule, C. R. K.and Poeschel, T. (2020), "Impact in granular matter: Force at the base of a container made with one movable wall", Phys. Rev. E, 102(1), 012903. https://doi.org/10.1103/PhysRevE.102.012903.
  4. Di Luzio, E.,Mazzanti, P., Brunetti, A. and Baleani, M. (2020), "Assessment of tectonic-controlled rock fall processes threatening the ancient Appia route at the Aurunci Mountain pass (central Italy)", Nat. Hazards, 102(3), 909-937. https://doi.org/10.1007/s11069-020-03939-4.
  5. Fanos, A.M., Pradhan, B., Mansor, S., Yusoff, Z.M.. and bin Abdullah, A.F. (2018) "A hybrid model using machine learning methods and GIS for potential rockfall source identification from airborne laser scanning data", Landslides, 15(9), 1833-1850. https://doi.org/ 10.1007/s10346-018-0990-4.
  6. Gao, G. and Meguid, M. (2018), "Modeling the impact of a falling rock cluster on rigid structures", J. Eng. Mech., 18(2), 04017141. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001045.
  7. He, M.C., Guo, P.F., Chen, S.Y., Gao, Y.B. and Wang Y.J. (2017), "Supporting technology of roadside in gob-side entry in 110 longwall mining method", AIP Conf. Proc., 1839, 020020. https:// doi.org/10.1063/1.4982385.
  8. He, M.C., Wang, Q. and Wu, Q.Y. (2021), "Innovation and future of mining rock mechanics", J. Rock Mech. Geotech. Eng., 13, 1-21. https://doi.org/10.1016/j.jrmge.2020.11.005.
  9. Horabik, J., Parafiniuk, P. and Molenda, M. (2016), "Experiments and discrete element method simulations of distribution of static load of grain bedding at bottom of shallow model silo", Biosyst. Eng., 149, 60-71. https://doi.org/10.1016/j.biosystemseng.2016.06.012.
  10. Hosseini, N. (2017). "Evaluation of the rockburst potential in longwall coal mining using passive seismic velocity tomography and image subtraction technique", J. Seismol., 21(5), 1101-1110. https://doi.org/10.1007/s10950-017-9654-4.
  11. Hu, J.Z., He, M.C., Wang, J. Ma, Z.M., Wang Y.J. and Zhang, X.Y. (2019). "Key parameters of roof cutting of gob-side entry retaining in a deep inclined thick coal seam with hard roof." Energies, 12, 934. https://doi.org/ 10.3390/en12050934.
  12. Konicek, P. and Schreiber, J. (2018). "Heavy rockbursts due to longwall mining near protective pillars: A case study", Int. J. Min. Sci. Technol., 28(5), 799-805. https://doi.org/10.1016/j.ijmst.2018.08.010.
  13. Le Roy, G., Helmstetter, A., Amitrano, D., Guyoton, F. and Le Roux-Mallouf, R. (2019), "Seismic analysis of the detachment and impact phases of a rockfall and application for estimating rockfall volume and free-fall height", J. Geophys. Res., 124(11), 2602-2622. https://doi.org/10.1029/ 2019JF004999.
  14. Liu, H.F., Zhang, J.X., Li, B.Y., Zhou, N., Li D.Q., Zhang, L.B. and Xiao X. (2021), "Long term leaching behavior of arsenic from cementzed paste backfill made of construction and demolition waste: Experimental and numerical simulation studies", J. Hazard. Mater., 416, 125813. https://doi.org/10.1016/j.jhazmat.2021.125813.
  15. Liu, J.N., He, M.C., Wang, Y.J., Huang, R.F., Yang, J., Tian, X.C., Ming, C. and Guo S. (2019), "Stability analysis and monitoring method for the key block structure of the basic roof of noncoal pillar mining with automatically formed gob-side entry", Adv. Civ. Eng., 5347683. https://doi.org/10.1155/2019/5347683.
  16. Mahajan, S., Tennenbaum, M., Pathak, S.N., Baxter, D., Fan, X.C., Padilla, P., Anderson, C., Fernandez-Nieves, A. and Ciamarra, M.P. (2020), "Reverse Janssen Effect in Narrow Granular Columns", Phys. Rev. Lett. 124(12), 128002. https://doi.org/10.1103/PhysRevLett.124.128002.
  17. Matchett, A.J., Langston, P.A. and McGlinchey, D. (2018), "A model for stresses in a circular silo with an off-centre circular core, using the concept of a principal stress cap: Solution for a completely filled silo and comparison with Janssen and DEM data", Chem. Eng. Res. Des., 129, 412-414. https://doi.org/ 10.1016/j.cherd.2017.11.029.
  18. Sarfarazi, V., Haeri, H. and Khaloo, A. (2016), "The effect of non-persistent joints on sliding direction of rock slopes", Comput. Concrete, 17(6), 723-737. https://doi.org/ 10.12989/cac.2016.17.6.723.
  19. Tan, Y.L., Ma, Q., Zhao, Z.H., Gu, Q.H., Fan, D.Y., Song S.L. and Huang, D. (2019), "Cooperative bearing behaviors of roadside support and surrounding rocks along gob-side", Geomech. Eng., 18(4), 439-448. https://doi.org/10.12989/gae.2019.18.4.439.
  20. Wojtecki, A., Mendecki, M.J. and Zuberek, W.M. (2016). "The seismic source parameters of tremors provoked by destress blastings in coal seam", J. Min. Sci., 52(2), 258-264. https://doi.org/ 10.1134/S1062739116020382.
  21. Yang, H.Y., Liu, Y.B., Cao, S.G., Pan, R.K., Wang, H., Li Y. and Luo F. (2020), "A caving self-stabilization bearing structure of advancing cutting roof for gob-side entry retaining with hard roof stratum", Geomech. Eng., 21(1), 23-33. https://doi.org/10.12989/gae.2020.21.1.023.
  22. Yoon, J., Ban, H., Hwang, Y. and Park, D. (2020), "Mitigation method of rockfall hazard on rock slope using large-scale field tests and numerical simulations", Adv. Civ. Eng., 3610651. https://doi.org/10.1155/2020/3610651.
  23. Zhang, C., Canbulat, I., Hebblewhite, B. and Ward, C.R. (2017), "Assessing coal burst phenomena in mining and insights into directions for future research", Int. J. Coal Geol. 179, 28-44. https://doi.org/ 10.1016/j.coal.2017.05.011.
  24. Zhang, X.Y., He, M.C., Yang. J., Wang, E.Y., Zhang, J.B. and Sun, Y. (2020), "An innovative non-pillar coal-mining technology with automatically formed entry: A case study", Engineering, 6, 1315-1329, https://doi.org/10.1016/j.eng.2020.01.014.
  25. Zhang, Z.Y., Shimada, H., Qian, D.Y. and Sasaoka, T. (2015), "Application of the retained gob-side gateroad in a deep underground coalmine", Int. J. Min. Reclam. Env., 30(5), 371-389. http://doi.org/10.1080/17480930.2015.1093729.
  26. Zhen, E.Z., Gao, Y.B., Wang, Y.J and Wang, S. (2019), "Comparative study on two types of nonpillar mining techniques by roof cutting and by filling artificial materials", Adv. Civ. Eng. https://doi.org/10.1155/2019/5267240.
  27. Zheng L., Chen, G.Q., Zen, K. and Kasama, K. (2012), "Numerical validation of multiplex acceleration model for earthquake induced landslides", Geomech. Eng., 4(1), 39-53. https://doi.org/10.12989/gae. 2012.4.1.039.
  28. Zidek, M., Zegzulka, J., Jezerska, L., Rozbroj, J., Gelnar, D. and Necas, J. (2020), "Simulation model of loading bin bottom by bulk material", Chem. Eng. Res. Des., 154, 151-161. https://doi.org/10.1016/j.cherd.2019.12.008.
  29. Zhou, P., Wang Y., Zhu G. and Gao Y. (2019), "Comparative analysis of the mine pressure at non-pillar longwall mining by roof cutting and traditional longwall mining", J. Geophys. Eng., 16, 423-438. https://doi.org/10.1093/jge/gxz026