Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Study on the distribution law of stress deviator below the floor of a goaf

  • Li, Zhaolong (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing)) ;
  • Shan, Renliang (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing)) ;
  • Wang, Chunhe (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing)) ;
  • Yuan, Honghu (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing)) ;
  • Wei, Yonghui (School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing))
  • Received : 2020.02.07
  • Accepted : 2020.03.25
  • Published : 2020.05.10
⟨ Previous Next ⟩

Abstract

In the process of mining closely spaced coal seams, the problem of roadway arrangement in lower coal seams has long been a concern. By means of mechanical model calculation and numerical simulation postprocessing, the distribution of the stress deviator below the floor of a goaf and the evolution of the stress deviator in the vertical and horizontal directions are studied under the influence of horizontal stress. The results of this theoretical study and numerical simulation show that the stress deviator decreases exponentially with increasing depth from the floor below the coal side. With the increase in the horizontal stress coefficient λ, the stress deviator concentration area shifts. The stress deviator is concentrated within 10 m below the goaf and 15 m laterally from the coal side; thus, the magnitude of the surrounding rock stress deviator should be considered when planning the construction of a roadway in this area.

Keywords

Acknowledgement

Supported by : China University of Mining & Technology (Beijing)

The research described in this paper was financially supported by the Fundamental Research Funds for Central Universities of China University of Mining & Technology (Beijing) (CN) (2010YL09).

References

  1. Bernasconi, A. (2002), "Efficient algorithms for calculation of shear stress amplitude and amplitude of the second invariant of the stress deviator in fatigue criteria applications", Int. J. Fatigue, 24(6), 649-657. https://doi.org/10.1016/S0142-1123(01)00181-5.
  2. Brady, B.H. and Brown, E.T. (1993), Rock Mechanics: for Underground Mining, Springer Science & Business Media.
  3. Cao, Z., He, X., Wang, E. and Kong, B. (2018). "Protection scope and gas extraction of the low-protective layer in a thin coal seam: Lessons from the DaHe coalfield, China", Geosci. J., 22(3), 487-499. https://doi.org/10.1007/s12303-017-0061-1.
  4. Chen, M., Yang, S.Q., Zhang, Y.C. and Zang, C.W. (2016). "Analysis of the failure mechanism and support technology for the Dongtan deep coal roadway", Geomech. Eng., 11(3), 401-420. https://doi.org/10.12989/gae.2016.11.3.401.
  5. Chen, Y., Ma, S. and Cao, Q. (2018), "Extraction of the remnant coal pillar in regular and irregular shapes: A case study", J. Loss Prevent. Process Industr., 55, 191-203. https://doi.org/10.1016/j.jlp.2018.06.012.
  6. Cui. L. (2017). "Analysis on reasonable location and extraction effect of high-level gas drainage roadway in Malan Mine", China Energy Environ. Protect., 39(6), 132-136 (in Chinese).
  7. Das, A.J., Mandal, P.K., Paul, P.S. and Sinha, R.K. (2019), "Generalised analytical models for the strength of the inclined as well as the flat coal pillars using rock mass failure criterion", Rock Mech. Rock Eng., 52(10), 3921-3946. https://doi.org/10.1007/s00603-019-01788-7.
  8. Fu, J., Song, W.D. and Tan, Y.Y. (2018). "Study of stability and evolution indexes of gobs under unloading effect in the deep mines", Geomech. Eng., 14(5), 439-451. https://doi.org/10.12989/gae.2018.14.5.439.
  9. He, F., Xu, L., Wu, H.K. and Li, T.D. (2014), "Deviatoric stress transfer and stability of surrounding rock in large-section open-off cut roof", Chin. J. Geotech. Eng., 36(6), 1122-1128 (in Chinese). https://doi.org/10.11779/CJGE201406018.
  10. 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.
  11. Jaouhar, E.M., Li, L and Aubertin, M. (2018), "An analytical solution for estimating the stresses in vertical backfilled stopes based on a circular arc distribution", Geomech. Eng., 15(3), 889-898. https://doi.org/10.12989/gae.2018.15.3.889.
  12. Jiang, Y. and Wang, Q. (2004), "J* integral of the specific deviator strain energy and its application", Appl. Math. Mech., 25(1), 110-122. https://doi.org/10.1007/BF02437299.
  13. Krause, E. (2009), "Systematisation of seams designed for extraction in mines from the aspect of the mining-geological and gas recognition level", Arch. Min. Sci., 54(2), 203-222.
  14. Kroon, M. and Faleskog, J. (2013). "Numerical implementation of a J2 and J3 dependent plasticity model based on a spectral decomposition of the stress deviator", Comput. Mech., 52(5), 1059-1070. https://doi.org/10.1007/s00466-013-0863-6.
  15. Li, Z.L., Dou, L.M., Cai, W., Wang, G.F., Ding, Y.L. and Kong, Y. (2016), "Roadway stagger layout for effective control of gob-side rock bursts in the longwall mining of a thick coal seam", Rock Mech. Rock Eng., 49(2), 621-629. https://doi.org/10.1007/s00603-015-0746-6.
  16. Liu, X., Li, X. and Pan, W. (2016), "Analysis on the floor stress distribution and roadway position in the close distance coal seams", Arab. J. Geosci., 9(2), 83. https://doi.org/10.1007/s12517-015-2035-9.
  17. Lockner, D.A. and Stanchits, S.A. (2002), "Undrained poroelastic response of sandstones to deviatoric stress change", J. Geophys. Res. Solid Earth, 107(B12), ETG-13. https://doi.org/10.1029/2001JB001460 .
  18. Mahdevari, S., Haghighat, H.S. and Torabi, S.R. (2013), "A dynamically approach based on SVM algorithm for prediction of tunnel convergence during excavation", Tunn. Undergr. Sp. Technol., 38, 59-68. https://doi.org/10.1016/j.tust.2013.05.002 .
  19. Mahdevari, S., Shahriar, K. and Esfahanipour, A. (2014), "Human health and safety risks management in underground coal mines using fuzzy TOPSIS", Sci. Total Environ., 488, 85-99. https://doi.org/10.1016/j.scitotenv.2014.04.076.
  20. Mahdevari, S., Shahriar, K., Sharifzadeh, M. and Tannant, D.D. (2017). "Stability prediction of gate roadways in longwall mining using artificial neural networks", Neur. Comput. Appl., 28(11), 3537-3555. https://doi.org/10.1007/s00521-016-2263-2 .
  21. 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.
  22. Majcherczyk, T., Niedbalski, Z. and Malkowski, P. (2014), "Analysis of yielding steel arch support with rock bolts in mine roadways stability aspect", Arch. Min. Sci., 59(3), 641-654. https://doi.org/10.2478/amsc-2014-0045.
  23. Marino, G.G. and Osouli, A. (2012), "Influence of softening on mine floor-bearing capacity: Case history", J. Geotech. Geoenviron. Eng., 138(10), 1284-1297. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000693.
  24. Nevitt, J.M. and Pollard, D.D. (2017), "Impacts of off fault plasticity on fault slip and interaction at the base of the seismogenic zone", Geophys. Res. Lett., 44(4), 1714-1723. https://doi.org/10.1002/2016GL071688.
  25. Shan. R., Kong. X. and Yu, Z. (2013), "Theory and application of strong support for coal roadway sidewall", Chin. J. Rock Mech. Eng., 32(7), 1304-1314 (in Chinese).
  26. Shang, H., Ning, J., Hu, S., Yang, S. and Qiu, P. (2019), "Field and numerical investigations of gateroad system failure under an irregular residual coal pillar in close‐distance coal seams", Energy Sci. Eng., 7(6), 2720-2740. https://doi.org/10.1002/ese3.455.
  27. Singh, A.K., Singh, R., Maiti, J., Kumar, R. and Mandal, P.K. (2011), "Assessment of mining induced stress development over coal pillars during depillaring", Int. J. Rock Mech. Min. Sci., 48(5), 805-818. https://doi.org/10.1016/j.ijrmms.2011.04.004.
  28. Sivakugan, N., Widisinghe, S. and Wang, V.Z. (2014), "Vertical stress determination within backfilled mine stopes", Int. J. Geomech., 14(5), 06014011. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000367.
  29. Suchowerska, A.M., Merifield, R.S. and Carter, J.P. (2013), "Vertical stress changes in multi-seam mining under supercritical longwall panels", Int. J. Rock Mech. Min. Sci., 61, 306-320. https://doi.org/10.1016/j.ijrmms.2013.02.009.
  30. Sun, J., Wang, L. and Zhao, G. (2019), "Stress distribution and failure characteristics for workface floor of a tilted coal seam", KSCE J. Civ. Eng., 23(9), 3793-3806. https://doi.org/10.1007/s12205-019-0786-7.
  31. Sun, J., Wang, L. and Zhao, G. (2019), "Stress distribution and failure characteristics for workface floor of a tilted coal seam", KSCE J. Civ. Eng., 23(9), 3793-3806. https://doi.org/10.1007/s12205-019-0786-7.
  32. Sun, Y.J., Xie, S.R., Li, S.J., Song, B.H. and Huang, X. (2016), "Reasonable location of roadway in coal pillar area under different layer-located key blocks and its surrounding rock control", J. China Univ. Min. Technol., 45(4), 694-701 (in Chinese). https://doi.org/10.13247/j.cnki.jcumt.000550.
  33. Tan, Y.L., Zhao, T.B. and Xiao, Y.X. (2010). "In situ investigations of failure zone of floor strata in mining close distance coal seams", Int. J. Rock Mech. Min. Sci., 47(5), 865-870. https://doi.org/10.1016/j.ijrmms.2009.12.016.
  34. Torano, J., Diez, R.R., Cid, J.R. and Barciella, M.C. (2002), "FEM modeling of roadways driven in a fractured rock mass under a longwall influence", Comput. Geotech., 29(6), 411-431. https://doi.org/10.1016/S0266-352X(02)00006-X.
  35. Wang, H., Zhao, Y.X., Mu, Z.L., Jiao, Z.H., Zhang, X. and Lu, Z.G. (2017), "The mechanism of rockburst in district coal pillar with high stress deviator and mining tremors impact and its prevention methods", J. China Univ. Min. Technol., 46(6), 1202-1212 (in Chinese). https://doi.org/10.13247/j.cnki.jcumt.000729.
  36. Wang, Z.J., Luo, Y.S., Guo, H. and Tian, H. (2012), "Effects of initial deviatoric stress ratios on dynamic shear modulus and damping ratio of undisturbed loess in China", Eng. Geol., 143, 43-50. https://doi.org/10.1016/j.enggeo.2012.06.009.
  37. Widisinghe, S. and Sivakugan, N. (2014), "Vertical stress isobars for trenches and mine stopes containing granular backfills", Int. J. Geomech., 14(2), 313-318. https://doi.org/10.12989/gae.2018.15.3.889.
  38. Xu, Y., Pan, K. and Zhang, H. (2019), "Investigation of key techniques on floor roadway support under the impacts of superimposed mining: Theoretical analysis and field study", Environ. Earth Sci., 78(15), 436. https://doi.org/10.1007/s12665-019-8431-9.
  39. Yan, H., Weng, M.Y., Feng, R.M. and Li, W.K. (2015), "Layout and support design of a coal roadway in ultra-close multiple-seams", J. Central South Univ., 22(11), 4385-4395. https://doi.org/10.1007/s11771-015-2987-7.
  40. Yavuz, H. (2004), "An estimation method for cover pressure re-establishment 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.
  41. Yuan, H.H., Shan, R.L. and Su, X.G. (2018), "Deformation characteristics and stability control of a gateroad in fully mechanized mining with large mining height", Arab. J. Geosci., 11(24), 767. https://doi.org/10.1007/s12517-018-4087-0.
  42. Zhang, M. and Zhang, Y. (2018), "Stability evaluation method for gateways in closely spaced coal seams and surrounding rock control technology", Arab. J. Sci. Eng., 43(10), 5469-5485. https://doi.org/10.1007/s13369-018-3201-7 .
  43. Zhang, W., Zhang, D., Qi, D., Hu, W., He, Z. and Zhang, W. (2018), "Floor failure depth of upper coal seam during close coal seams mining and its novel detection method", Energy Explor. Exploit., 36(5), 1265-1278. https://doi.org/10.1177/0144598717747622.
  44. Zhang. G. and He, F. (2016), "Asymmetric failure and control measures of large cross-section entry roof with strong mining disturbance and fully-mechanized caving mining", Chin. J. Rock Mech. Eng., 35(4), 806-818 (in Chinese). https://doi.org/10.13722/j.cnki.jrme.2015.0917.
  45. Zhao, C., Hebblewhite, B.K. and Galvin, J.M. (2000), "Analytical solutions for mining induced horizontal stress in floors of coal mining panels", Comput. Meth. Appl. Mech. Eng., 184(1), 125-142. https://doi.org/10.1016/S0045-7825(99)00097-3.
  46. Zhao, Z., Deng, G., Han, Y., Zhang, Z., Dong, Y. and Gao, Y. (2020), "Comparison of deformation behavior of saturated sand under constant and variable deviatoric stress", KSCE J. Civ. Eng., 24(3), 762-769. https://doi.org/10.1007/s12205-020-0976-3.
  47. Zhu, S., Lu, L., Wu, Y. and Zhang, T. (2017), "Comprehensive study on the deformation and failure characteristics of a mining-impacted deep double-longwall working face floor", J. Geophys. Eng., 14(3), 641-653. https://doi.org/10.1088/1742-2140/aa64aa.

Cited by

  1. Hoek-Brown Failure Criterion-Based Creep Constitutive Model and BP Neural Network Parameter Inversion for Soft Surrounding Rock Mass of Tunnels vol.11, pp.21, 2020, https://doi.org/10.3390/app112110033