Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Effects of the borehole drainage for roof aquifer on local stress in underground mining

  • Shao, Jianli (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Zhang, Qi (Department of Civil and Environmental Engineering, Stanford University) ;
  • Zhang, Wenquan (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Wang, Zaiyong (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology) ;
  • Wu, Xintao (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology)
  • Received : 2020.09.07
  • Accepted : 2021.02.09
  • Published : 2021.03.10
⟨ Previous Next ⟩

Abstract

Pre-drainage of groundwater in the roof aquifer by boreholes is the main method for prevention of roof water disaster, and the drop in the water level during the drainage leads to the variation of the local stress in the overlying strata. Based on a multitude of boreholes for groundwater drainage from aquifer above the 1303 mining face of Longyun Coal Mine, theoretical analysis and numerical simulation are used to investigate the local stress variation in the process of borehole drainage. The results show that due to the drop in the water level of the roof aquifer during the drainage, the stress around the borehole gradually evolved. From the center of the borehole to the outside, a stress-relaxed zone, a stress-elevated zone, and a stress-recovered zone are sequentially formed. Along with the expansion of drainage influence, the stress peak in the stress-elevated zone also moves to the outside. When the radius of influence develops to the maximum, the stress peak position no longer moves outward. When the coal mining face advances to the drainage influence range, the abutment pressure in front of the mining face is superimposed with the high local stress around the borehole, which increases the risk of stress concentration. The present study provides a reference for the stress concentration caused by borehole drainage, which can be potentially utilized in the optimal arrangement of drainage boreholes in underground mining.

Keywords

References

  1. Ahmed, E., Fumagalli, A. and Budisa, A. (2019), "A multiscale flux basis for mortar mixed discretizations of reduced Darcy-Forchheimer fracture models", Comput. Method. Appl. Mech. Eng., 354, 16-36. https://doi.org/10.1016/j.cma.2019.05.034.
  2. Celik, F. (2019), "The observation of permeation grouting method as soil improvement technique with different grout flow models", Geomech. Eng., 17(4), 367-374. https://doi.org/10.12989/gae.2019.17.4.367.
  3. Dong, D., Sun, W. and Xi, S. (2012), "Optimization of mine drainage capacity using FEFLOW for the No. 14 coal seam of China's Linnancang Coal Mine", Mine Water Environ., 31(4), 353-360. https://doi.org/10.1007/s10230-012-0205-5.
  4. Deng, D.P., Li, L. and Zhao, L.H. (2019), "Stability analysis of slopes under groundwater seepage and application of charts for optimization of drainage design", Geomech. Eng., 17(2), 181-194. https://doi.org/10.12989/gae. 2019.17.2.181.
  5. Feng, Q., Yuan, X. and Zhan, H. (2019), "Flow to a partially penetrating well with variable discharge in an anisotropic two-layer aquifer system", J. Hydrol., 578(124027). https://doi.org/10.1016/j.jhydrol.2019.124027.
  6. Feng, X. and Ding, W. (2007), "Experimental study of limestone micro-fracturing under a coupled stress, fluid flow and changing chemical environment", Int. J. Rock Mech. Min. Sci., 44(3), 437-448. https://doi.org/10.1016/j.ijrmms.2006.07.012.
  7. FiaFR (2020), Flow in a Fractured Reservoir 90421; COMSOL Inc. http://cn.comsol.com/model/flow-in-a-fractured-reservoir90421.
  8. Hu, Z.Q., Chen, C., Xiao, W., Wang, X.J. and Gao, M.J. (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.
  9. Huang, H. (2017), "Optimization research on dewatering technology of roof water in Jinjie mine", Ph.D. Dissertation, Graduate School of China Coal Research Institute, Beijing, China.
  10. Ji, Y., and Li, X. (2018), "Analysis on Geo-stress and casing damage based on fluid-solid coupling for Q9G3 block in Jibei oil field", Geomech. Eng., 15(1), 677-686. https://doi.org/10.12989/gae.2018.15.1.677.
  11. Kim, J., Kim, J., Lee, J. and Yoo, H. (2018), "Prediction of transverse settlement trough considering the combined effects of excavation and groundwater depression", Geomech. Eng., 15(3), 851-859. https://doi.org/10.12989/gae.2018.15.3.851.
  12. Kim, N., Park, D., Jung, H. and Kim, M. (2020), "Deformation characteristics of tunnel bottom after construction under geological conditions of long-term deformation", Geomech. Eng., 21(2), 171-178. https://doi.org/10.12989/gae.2020.21.2.171.
  13. Li, B., Fang, H., Yang, K., He, H., Tan, P. and Wang, F. (2019), "Mechanical response and parametric sensitivity analyses of a drainage pipe under multiphysical coupling conditions", Complexity, 3635621. https://doi.org/10.1155/2019/3635621.
  14. Loupasakis, C., Angelitsa, V., Rozos, D. and Spanou, N. (2014), "Mining geohazards-land subsidence caused by the dewatering of opencast coal mines: The case study of the Amyntaio coal mine, Florina, Greece", Nat. Hazards, 70(1), 675-691. https://doi.org/10.1007/s11069-013-0837-1.
  15. Louis, C. (1974), Rock Hydraulics, in Rock Mechanics, Springer, Vienna, Austria.
  16. Ma, D., Rezania, M., Yu, H. and Bai, H. (2017), "Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration", Eng. Geol., 217, 61-70. https://doi.org/10.1016/j.enggeo.2016.12.006.
  17. Ma, D., Wang, J. and Li, Z. (2019), "Effect of particle erosion on mining-induced water inrush hazard of karst collapse pillar", Environ. Sci. Pollut. R., 26(19), 19719-19728. https://doi.org/10.1007/s11356-019-05311-x.
  18. Meng, L., Feng, Q. and Li, Q. (2018), "Coupled simulation-optimization model for draining confined aquifer via underground boreholes to prevent water inrush of coal mines", Environ. Earth Sci., 77(17), 607. https://doi.org/10.1007/s12665-018-7794-7.
  19. Palmer, I. (2009), "Permeability changes in coal: Analytical modeling", Int. J. Coal Geol., 77(1-2), 119-126. https://doi.org/10.1016/j.coal.2008.09.006.
  20. Rongved, M. and Cerasi, P. (2019), "Simulation of stress hysteresis effect on permeability increase risk along a fault", Energies, 12(18), 3458. https://doi.org/10.3390/en12183458.
  21. Rutqvist, J. and Tsang, C. (2002), "A study of caprock hydromechanical changes associated with CO2-injection into a brine formation", Environ. Geol., 42(2-3), 296-305. https://doi.org/10.1007/s00254-001-0499-2.
  22. Samani, N., Kompani-Zare, M., Seyyedian, H. and Barry, D.A. (2006), "Flow to horizontal drains in isotropic unconfined aquifers", J. Hydrol., 324(1-4), 178-194. https://doi.org/10.1016/j.jhydrol.2005.10.003.
  23. Shu, C.X. (2019), "The mechanism and prevention of rock burst at the water-rich working face in the deep zone of mine in the adjacent area of Shaanxi and Inner Mongolia", Ph.D. Dissertation, University of Science and Technology Beijing, Beijing, China.
  24. Sun, W.J., Zhou, W.F. and Jiao, J. (2016), "Hydrogeological classification and water inrush accidents in China's coal mines", Mine Water Environ., 35(2), 214-220. https://doi.org/10.1007/s10230-015-0363-3.
  25. Taleghani, A. D., Gonzalez-Chavez, M., Yu, H., and Asala, H. (2018), "Numerical simulation of hydraulic fracture propagation in naturally fractured formations using the cohesive zone model", J. Petrol. Sci. Eng., 165, 42-57. https://doi.org/10.1016/j.petrol.2018.01.063.
  26. Wang, B., Wu, C., Kang, L.G., Reniers, G. and Huang, L. (2018), "Work safety in China's thirteenth five-year plan period (2016-2020): Current status, new challenges and future tasks", Safety Sci., 104, 164-178. https://doi.org/10.1016/j.ssci.2018.01.012.
  27. Wu, Q., Liu, Y., Wu, X., Liu, S., Sun, W. and Zeng, Y. (2016), "Assessment of groundwater inrush from underlying aquifers in Tunbai coal mine, Shanxi province, China", Environ. Earth Sci., 75(7379). https://doi.org/10.1007/s12665-016-5542-4.
  28. Yao, Q.L. (2011), "Researches on strength weakening mechanism and control of water-enriched roofs of roadway", Ph.D. Dissertation, China University of Mining and Technology, Xuzhou, China.
  29. Yasuhara, H., Kinoshita, N., Ohfuji, H., Lee, D.S., Nakashima, S. and Kishida, K. (2011), "Temporal alteration of fracture permeability in granite under hydrothermal conditions and its interpretation by coupled chemo-mechanical model", Appl. Geochem., 26(12), 2074-2088. https://doi.org/10.1016/j.apgeochem.2011.07.005.
  30. Zhang, Q. (2020), "Hydromechanical modeling of solid deformation and fluid flow in the transversely isotropic fissured rocks", Comput. Geotech., 128, 103812. https://doi.org/10.1016/j.compgeo.2020.103812.
  31. Zhang, Q., Yan, X. and Shao, J. (2021), "Fluid flow through anisotropic and deformable double porosity media with ultralow matrix permeability: A continuum framework", J. Petrol. Sci. Eng., 200, 108349. https://doi.org/10.1016/j.petrol.2021.108349.
  32. Zhao, C., Jin, D., Geng, J. and Sun, Q. (2019a), "Numerical simulation of the groundwater system for mining shallow buried coal seams in the ecologically fragile areas of Western China", Mine Water Environ., 38(1), 158-165. https://doi.org/10.1007/s10230-018-0551-z.
  33. Zhao, C., Jin, D., Wang, H., Wang, Q., Wang, S. and Liu, Y. (2019b), "Construction and application of overburden damage and aquifer water loss model in medium-deep buried coal seam mining in Yushen mining area", J. China Coal Soc., 44(7), 2227-2235. https://doi.org/10.13225/j.cnki.jccs.2019.0159.
  34. Zhao, J.H., Zhang, X.G., Jiang, N., Yin, L.M. and Guo, W.J. (2020a), "Porosity zoning characteristics of fault floor under fluid-solid coupling", B. Eng. Geol. Environ., 78(8), 6267-6283. https://doi.org/10.1007/s10064-019-01508-z.
  35. Zhao, Y., Wu, Q., Chen, T., Zhang, X., Du, Y. and Yao, Y. (2020b), "Location and flux discrimination of water inrush using its spreading process in underground coal mine", Safety Sci., 124, 104566. https://doi.org/10.1016/j.ssci.2019.104566.
  36. Zhou, F., Sun, W., Shao, J., Kong, L. and Geng, X. (2020), "Experimental study on nano silica modified cement base grouting reinforcement materials", Geomech. Eng., 20(1), 67-73. https://doi.org/10.12989/gae.2020.20.1.067.

Cited by

  1. Mathematical Evaluation on the Control of Mining-Induced Ground Subsidence in Thick Loose Strata vol.6, pp.50, 2021, https://doi.org/10.1021/acsomega.1c04970