Advertisement

Distribution and Evolution Characteristics of Macroscopic Stress Field in Gob-Side Entry Retaining by Roof Cutting

  • Zhen ZhuEmail author
  • Chun Zhu
  • Hongping Yuan
Original Paper
  • 45 Downloads

Abstract

Non-pillar mining technology plays an important role in sustainable exploitation of coal resources. Gob-side entry retaining by roof cutting (GERRC) is a new technique regarding a non-pillar mining method based on the “cutting cantilever beam theory”. In order to study the distribution and evolution characteristics of macroscopic stress field of surrounding rocks in GERRC, and find out differences from traditional pillar retained mining method (PRMM), some key issues about abutment pressure and stress concentration shell were analyzed by numerical simulations. Results show that: (1) distribution characteristics of lead abutment pressure for the two mining methods are basically the same during the primary mining stage; (2) during the secondary mining stage, peak stress in front of mining face of the two modes is close, while the abutment pressure can be transferred more evenly to coal and rock mass far away from goaf when using GERRC, and that is more likely to cause high stress concentration in the coal mass near the goaf when mining with PRMM; (3) for the PRMM, lateral abutment pressure will produce a higher stress concentration in section coal pillar and a high residual stress will be maintained in it when coal masses on both sides of the pillar are extracted; (4) adjacent goafs can be connected to form a wide range of pressure relief region when using GERRC, and shape of distribution of the maximum principal stress appears a semi-space ellipsoidal shell in three-dimensional space, and it is a single arch shape in the section perpendicularly to the mining direction, however, it looks like a “m” shape in that section when mining with PRMM because of the high stress concentration in the coal pillar.

Keywords

Roof cutting and pressure relief Non-pillar mining method Macroscopic stress field Abutment pressure Stress concentration shell Evolving characteristic 

Notes

Acknowledgements

The authors wish to acknowledge the funding support from Fund Project: the National Key Research Development Program (China) (Grant No. 2016YFC0600900) and the National Natural Science Foundation of China (Grant No. 41602308)

References

  1. Chang JC (2011) Distribution laws of abutment pressure around fully mechanized top-coal caving face by in situ measurement. J Coal Sci Eng (China) 17(1):1–5CrossRefGoogle Scholar
  2. Gao YB, Yang J, He MC, Wang YJ, Gao Q (2017) Mechanism and control techniques for gangue rib deformations in gob-side entry retaining formed by roof fracturing in thick coal seams. Chin J Rock Mech Eng 36(10):2492–2502Google Scholar
  3. Gao YB, He MC, Yang J, Ma XG (2018) Experimental study of caving and distribution of gangues influenced by roof fracturing in pillarless mining with gob-side entry retaining. J China Univ Min Technol 47(1):21–31Google Scholar
  4. Guo ZB, Wang J, Cao TP, Chen L, Wang J (2016) Research on key parameters of gob-side entry retaining automatically formed by roof cutting and pressure release in thin coal seam mining. J China Univ Min Technol 45(5):879–885Google Scholar
  5. Guo PF, He MC, Wang J, Zhou HT (2017) Test study on multi tray bolt in gob-side entry retaining formed by roof cut and pressure releasing. Geotech Geol Eng 35(5):2497–2506CrossRefGoogle Scholar
  6. He MC, Zhu GL, Guo ZB (2015) Longwall mining “cutting cantilever beam theory” and 110 mining method in China: the third mining science innovation. J Rock Mech Geotech Eng 7:483–492CrossRefGoogle Scholar
  7. He MC, Chen SY, Guo ZB, Yang J, Gao YB (2017) Control of surrounding rock structure for gob-side entry retaining by cutting roof to release pressure and its engineering application. J China Univ Min Technol 46(5):959–969Google Scholar
  8. He MC, Gao YB, Yang J, Guo ZB, Wang EY, Wang YJ (2018) An energy-gathered roof cutting technique in no-pillar mining and its impact on stress variation in surrounding rocks. Chin J Rock Mech Eng 39(1):254–264Google Scholar
  9. Li JZ, Zhang M, Li Y, Hu H (2018) Surrounding rock control mechanism in the gob-side retaining entry in thin coal seams. J South Afr Inst Min Metall 118:471–480Google Scholar
  10. Liu GJ, Mu ZL, Chen JJ, Yang J, Cao JL (2018) Rock burst risk in an island longwall coal face by stress field. Geosci J 22(4):609–622CrossRefGoogle Scholar
  11. Luan HJ, Jiang YJ, Lin HL, Li GF (2018) Development of a new gob-side entry-retaining approach and its application. Sustainability 10(2):470CrossRefGoogle Scholar
  12. Luo F, Cao SG, Li GD, Li Y (2018) Evolution of mine-induced stress concentration shell and stress relief body and its gas migration. J Min Saf Eng 35(1):155–162Google Scholar
  13. Qian MG, Xu JL, Wang JC (2018) Further on the sustainable mining of coal. J China Coal Soc 25(1):1–13Google Scholar
  14. Sun XM, Liu X, Liang GF, Wang D, Jiang YL (2014) Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams. Chin J Rock Mech Eng 33(7):1449–1456Google Scholar
  15. Wang HB, Chao A, Zhang SD (2014) Application on gob-side entry retaining technology with coal gangue bag packing in medium-thick coal seams. Appl Mech Mater 446–447:1364–1368CrossRefGoogle Scholar
  16. Wang M, Bai JB, Li WF, Wang XY, Cao SG (2015) Failure mechanism and control of deep gob-side entry. Arab J Geosci 8:9117–9131CrossRefGoogle Scholar
  17. Wang JC, Liu F, WANG L (2016) Sustainable coal mining and mining sciences. J China Coal Soc 41(11):2651–2660Google Scholar
  18. Wang CB, Cao AY, Zhu GA, Jing GC, Li J, Chen T (2017a) Mechanism of rock burst induced by fault slip in an island coal panel and hazard assessment using seismic tomography: a case study from Xuzhuang colliery, Xuzhou, China. Geosci J 21(3):469–481CrossRefGoogle Scholar
  19. Wang Q, Pan R, Jiang B, Li SC, He MC, Sun HB, Wang L, Qin Q (2017b) Study on failure mechanism of roadway with soft rock in deep coal mine and confined concrete support system. Eng Fail Anal 81:155–177CrossRefGoogle Scholar
  20. Wang PF, Zhao JL, Wang ZQ, Sun ZW, Xu CH, Song ZY, Su Y (2017c) Mechanism of gob-pillar interaction for subcritical panels and its application. Chin J Rock Mech Eng 36(5):1185–1200Google Scholar
  21. Xia HC, Song ZQ, Ru LJ (2011) Finite element analysis of abutment pressure distribution characteristic of working faces in fully mechanized sublevel caving face. Appl Mech Mater 71–78:3358–3361CrossRefGoogle Scholar
  22. Xie GX (2005) Mechanical characteristics of fully mechanized top-coal caving face and surrounding rock stress shell. J China Coal Soc 30(3):309–313Google Scholar
  23. Xie GX (2006) Influence of mining thickness on mechanical characteristics of working face and surrounding rock stress shell. J China Coal Soc 31(1):6–10Google Scholar
  24. Xie GX, Wang L (2008) Effect of longwall length on mechanical characteristics of surrounding rock stress shell in mining face. J China Coal Soc 33(12):1336–1340Google Scholar
  25. Xie GX, Wang L (2013) Lithologic effect on the mechanical characteristics of mining-induced stress shell. J China Coal Soc 38(1):44–49Google Scholar
  26. Yang ZQ, Liu C, Tang SC, Dou LM, Cao JL (2018a) Rock burst mechanism analysis in an advanced segment of gob-side entry under different dip angles of the seam and prevention technology. Int J Min Sci Technol.  https://doi.org/10.1016/j.ijmst.2017.11.001
  27. Yang YS, Zhang DM, Bai X, Yang H (2018b) Research on correlation between abutment pressure and gas drainage flow of coal seam. Geotech Geol Eng 36(4):2087–2095CrossRefGoogle Scholar
  28. Yao QL, Zhou J, Li YN, Tan YM, Jiang ZG, (2015) Distribution of side abutment stress in roadway subjected to dynamic pressure and its engineering application. Shock Vib 929836Google Scholar
  29. Yuan L (2017) Scientific conception of precision coal mining. J China Coal Soc 42(1):1–7Google Scholar
  30. Yuan Y, Wang WJ, Li SQ, Zhu QJ (2018) Failure mechanism for surrounding rock of deep circular roadway in coal mine based on mining-induced plastic zone. Adv Civ Eng 2018,1835381Google Scholar
  31. Zhang N, Zhang NC, Han CL, Qian DY, Xue F (2013) Borehole stress monitoring analysis on advanced abutment pressure induced by longwall mining. Arab J Geosci 7(2):457–463CrossRefGoogle Scholar
  32. Zhang W, Zhang DS, Chen JB, Xu MT (2014) Control of surrounding rock deformation for gob-side entry driving in narrow coal pillar of island coalface. J China Univ Min Technol (China) 43(1):36–43+55Google Scholar
  33. Zhang ZZ, Bai JB, Chen Y, Yan S (2015) An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving. Int J Rock Mech Min Sci 80:1–11CrossRefGoogle Scholar
  34. Zhang ZZ, Wang WJ, Li SQ, Yu XY (2018) Analysis on rockbolt support interaction with roof dilatancy above roadside backfill area in gob-side entry retaining. Geotech Geol Eng 36(4):2577–2591CrossRefGoogle Scholar
  35. Zhu Z, Zhang KX, Yuan HP (2018) Control technology and its application of roadway side wall formed by gangue in gob-side entry retaining formed by roof cutting and pressure releasing. Coal Sci Technol 46(3):25–32Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.State Key Laboratory for GeoMechanics and Deep Underground EngineeringChina University of Mining and TechnologyBeijingChina
  2. 2.Shaanxi Ruineng Coal Co., LtdYananChina

Personalised recommendations