Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Ground response of a gob-side gateroad suffering mining-induced stress in an extra thick coal seam

  • He, Fulian (School of Energy and Mining Engineering, China University of Mining and Technology (Beijing)) ;
  • Gao, Sheng (School of Energy and Mining Engineering, China University of Mining and Technology (Beijing)) ;
  • Zhang, Guangchao (School of Energy and Mining Engineering, China University of Mining and Technology (Beijing)) ;
  • Jiang, Bangyou (College of Energy and Mining Engineering, Shandong University of Science and Technology)
  • Received : 2020.03.26
  • Accepted : 2020.05.18
  • Published : 2020.07.10
⟨ Previous Next ⟩

Abstract

This paper presents an investigation of the ground response of a gob-side gateroad suffering mining stress induced by a 21 m-thick coal seam extraction. A field observation, including entry convergence and stress changes monitoring, was first conducted in the tailgate 8209. The observation results of entry convergence showed that, during the adjacent panel 8210 retreating period, the deformation of the gob-side gateroad experienced a continuous increase stage, subsequently, an accelerating increase stage, and finally, a slow increase stage. However, strong ground response, including roof bending deflection, rib extrusion and floor heave, occurred during the current panel 8209 retreating period, and the maximum floor heave reached 1530 mm. The stress changes within coal mass of the two ribs demonstrated that the gateroad was always located in the stress concentrated area, which responsible for the strong response of the tailgate 8209. Subsequently, a hydraulic fracture technique was proposed to pre-fracture the two hard roofs above the tailgate 8209, thus decreasing the induced disturbance on the tailgate. The validity of the above roof treatment was verified via field application. The finding of this study could be a reference for understanding the stability control of the gob-side gateroad in extra thick coal seams mining.

Keywords

Acknowledgement

This study was supported by the National Natural Science Foundation of China (No.51974317 and 51904164), Yue Qi Distinguished Scholar Project (800015Z1138) China University of Mining & Technology (Beijing), Fundamental Research Funds for the Central Universities (800015J6), the Natural Science Foundation of Shandong Province (ZR2018QEE001).

References

  1. Adhikary, D.P. and Guo, H. (2015), "Modelling of longwall Mining-Induced strata permeability change", Rock Mech. Rock Eng., 48(1), 345-359. https://doi.org/10.1007/s00603-014-0551-7.
  2. Basarir, H., Ferid Oge, I. and Aydin, O. (2015), "Prediction of the stresses around main and tail gates during top coal caving by 3D numerical analysis", Int. J. Rock Mech. Min. Sci., 76, 88-97. https://doi.org/10.1016/j.ijrmms.2015.03.001.
  3. Bai, J.B, Shen, W.L, Guo, G.W., Wang, X.Y. and Yu, Y. (2015), "Roof deformation, failure characteristics, and preventive techniques of Gob-Side entry driving heading adjacent to the advancing working face", Rock Mech. Rock Eng., 48(6), 2447-2458. https://doi.org/10.1007/s00603-015-0713-2.
  4. Bai, Q.S., Tu, S.H., Wang, F.T. and Zhang, C. (2017), "Field and numerical investigations of gateroad system failure induced by hard roofs in a longwall top coal caving face", Int. J. Coal Geol., 173, 176-199. https://doi.org/10.1016/j.coal.2017.02.015.
  5. Carranza-Torres, C. (2009), "Analytical and numerical study of the mechanics of rockbolt reinforcement around tunnels in rock masses", Rock Mech. Rock Eng., 42(2), 175-228. https://doi.org/10.1007/s00603-009-0178-2.
  6. Feng, X.W., Zhang, N., Xue, F. and Xie, Z. (2019), "Practices, experience, and lessons learned based on field observations of support failures in some Chinese coal mines", Int. J. Rock Mech. Min. Sci., 123, 104097. https://doi.org/10.1016/j.ijrmms.2019.104097.
  7. Huang, B.X., Chen, S.L. and Zhao, X.L. (2017), "Hydraulic fracturing stress transfer methods to control the strong strata behaviours in gob-side gateroads of longwall mines", Arab. J. Geosci., 10(11), 236. https://doi.org/10.1007/s12517-017-3024-y.
  8. Jiang, B.Y., Gu, S.T., Wang, L.G., Zhang, G.C. and Li, W.L. (2019), "Strainburst process of marble in tunnel-excavationinduced stress path considering intermediate principal stress", J. Central South Univ., 26(4), 984-999. https://doi.org/10.1007/s11771-019-4065-z.
  9. Li, C.C. (2010), "Field observations of rock bolts in high stress rock masses", Rock Mech. Rock Eng., 43(4), 491-496. https://doi.org/10.1007/s00603-009-0067-8.
  10. Liu, Q., Chai, J., Chen, S.J., Zhang, D.D., Yuan, Q. and Wang, S. (2020), "Monitoring and correction of the stress in an anchor bolt based on pulse prepumped Brillouin optical time domain analysis", Energy Sci. Eng., 1-13. https://doi.org/10.1002/ese3.644.
  11. 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.
  12. Oreste, P. (2005), "Back-analysis techniques for the improvement of the understanding of rock in underground constructions", Tunn. Undergr. Sp. Technol., 20(1), 7-21. https://doi.org/10.1016/j.tust.2004.04.002.
  13. Qiu, P.Q., Wang, J., Ning, J.G., Liu, X.S., Hu, S.C. and Gu, Q.H. (2019), "Rock burst criteria of deep residual coal pillars in an underground coal mine: A case study", Geomech. Eng., 19(6), 499-511. https://doi.org/10.12989/gae.2019.19.6.499.
  14. Seo, H., Choi, H. and Lee, I. (2016), "Numerical and experimental investigation of pillar reinforcement with pressurized grouting and pre-stress", Tunn. Undergr. Sp. Technol., 54, 135-144. https://doi.org/10.1016/j.tust.2015.10.018.
  15. Shabanimashcool, M. and Li, C.C. (2015), "Analytical approaches for studying the stability of laminated roof strata", Int. J. Rock Mech. Min. Sci., 79, 99-108. https://doi.org/10.1016/j.ijrmms.2015.06.007.
  16. Shen, W.L., Bai, J.B., Li, W.F. and Wang, X.Y. (2018), "Prediction of relative displacement for entry roof with weak plane under the effect of mining abutment stress", Tunn. Undergr. Sp. Technol., 71, 309-317. https://doi.org/10.1016/j.tust.2017.08.023.
  17. Shnorhokian, S., Mitri, H.S. and Thibodeau, D. (2014), "A methodology for calibrating numerical models with a heterogeneous rockmass", Int. J. Rock Mech. Min. Sci., 70, 353-367. https://doi.org/10.1016/j.ijrmms.2014.05.011.
  18. Wang, H.W., Xue, S., Jiang, Y.D., Deng, D., Shi, S. and Zhang, D. (2018), "Field investigation of a roof fall accident and large roadway deformation under geologically complex conditions in an underground coal mine", Rock Mech. Rock Eng., 51(6), 1863-1883. https://doi.org/10.1007/s00603-018-1425-1.
  19. Wang, J., Ning, J.G., Qiu, P.Q., Yang, S. and Shang, H.F. (2019), "Microseismic monitoring and its precursory parameter of hard roof collapse in longwall faces: A case study", Geomech. Eng., 17(4), 375-383. https://doi.org/0.12989/gae.2019.17.4.375. https://doi.org/10.12989/GAE.2019.17.4.375
  20. Wang, J., Qiu, P.Q., Ning, J.G., Zhuang L. and Yang, S. (2020), "A numerical study of the mining-induced energy redistribution in a coal seam adjacent to an extracted coal panel during longwall face mining: A case study", Energy Sci. Eng., 8(3), 817-835. https://doi.org/10.1002/ese3.553.
  21. Yavuz, H. (2004), "An estimation method for cover pressure reestablishment distance and pressure distribution in the goaf of longwall coal mines", Int. J. Rock Mech. Min. Sci., 41(2), 193-205. https://doi.org/10.1016/S1365-1609(03)00082-0.
  22. Zang, C.W., Chen, M., Zhang, G.C., Wang, K. and Gu, D.D. (2020), "Research on the failure process and stability control technology in a deep roadway: Numerical simulation and field test", Energy Sci. Eng. https://doi.org/10.1002/ese3.664.
  23. Zhang, G.C., Chen, L.J., Wen, Z.J., Chen, M., Tao, G.Z., Li, Y. and Zuo, H. (2020), "Squeezing failure behavior of roof-coal masses in a gob-side entry driven under unstable overlying strata", Energy Sci. Eng. https://doi.org/10.1002/ese3.678.
  24. Zhang, G.C., He F.L., Jia H.G. and Lai Y.H. (2017), "Analysis of gateroad stability in relation to yield pillar size: A case study", Rock Mech. Rock Eng., 50(5), 1263-1278. https://doi.org/10.1007/s00603-016-1155-1.
  25. Zhang, G.C., Tan, Y.L., Liang, S.J. and Jia, H.G. (2018), "Numerical estimation of suitable Gob-Side filling wall width in a highly gassy longwall mining panel", Int. J. Geomech., 18(8), 04018091. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001217.
  26. Zhang, G.C., Wen, Z.J., Liang, S.J., Tan, Y.L., Tian, L., Zhao, Y. Q. and Zhao, D.S. (2019), "Ground response of a gob-side entry in a longwall panel extracting 17 m-Thick coal seam: A case study", Rock Mech. Rock Eng., 53, 497-516. https://doi.org/10.1007/s00603-019-01922-5.

Cited by

  1. Accurate Perception of Rock Strata Movement for Environmental Protection in Coal Mining: Taking Thick and Hard Roof Cooperative Control as an Example vol.2021, 2020, https://doi.org/10.1155/2021/4321255
  2. A study on the geometric effects of a concrete filling body in remaining roadways with fully mechanised caving vol.18, pp.5, 2020, https://doi.org/10.1093/jge/gxab043