Abstract
Multi-seam upward mining is of considerable importance to improve the resource recovery rate and realize waste-free mining. Taking the Dianping coal mine in Shanxi Province as an example, the development height and evolution process of the overburden fracture after mining of the Taiyuan Group coal seam were studied by combining theoretical analysis, field measurement, and numerical simulation to verify the feasibility of upward mining (UM) of the multi-layer soft–hard alternate complex roof of Taiyuan group coal seam in Shanxi Province, China. A new method for determining the development height of overburden fractures (DHOF) is proposed on the basis of analyzing the fracture characteristics of rock strata with different lithologies. This method first calculates the fracture of key strata and then that of key soft rock strata controlled by key strata. The above method found that the DHOF of the Dianping coal mine is 52.5 m, and the field measurement and numerical simulation results are 53 and 49.7 m, respectively. The numerical simulation study found that after the upper and lower coal seams were mined, the rock fissures between the two seams were only connected to a small extent near the open-off cut, and most of the area still impermeable. Therefore, using the proposed method in UM is feasible after simple reinforcement of the rock seam in the vicinity of the open-off cut. In addition, on-site field measurements applied the borehole resistivity method to present a dynamic all-round view of the overburden fracture development process, and monitoring results indicate the existence of an unconnected fracture zone at the top of the fracture zones. Research results provide an important theoretical and technical basis for the prediction of the development height of the overlying rock fracture zone and the feasibility of UM in the Taiyuan coalfield, Shanxi Province.
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References
Adhikary DP, 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
Bai JW, Feng GR, Wang SY, Qi TY, Yang J, Guo J, Li Z, Du XJ, Wang ZH, Du YL, Zhang YJ (2018) Vertical stress and stability of interburden over an abandoned pillar working before upward mining: a case study. Roy Soc Open Sci 5(8):180346. https://doi.org/10.1098/rsos.180346
Cheng GW, Ma TH, Tang CA, Liu HY, Wang SJ (2017) A zoning model for coal mining - induced strata movement based on microseismic monitoring. Int J Rock Mech Min Sci 94:123–138. https://doi.org/10.1016/j.ijrmms.2017.03.001
Cheng GW, Yang TH, Liu HY, Wei LK, Zhao Y, Liu YL, Qian JW (2020) Characteristics of stratum movement induced by downward longwall mining activities in middle-distance multi-seam. Int J Rock Mech Min Sci 136:104517. https://doi.org/10.1016/j.ijrmms.2020.104517
Cui F, Jia C, Lai XP (2019a) Study on deformation and energy release characteristics of overlying strata under different mining sequence in close coal seam group based on similar material simulation. Energies 12(23):4485. https://doi.org/10.3390/en12234485
Cui F, Yang YB, Lai XP, Cao JT (2019b) Similar material simulation experimental study on rockbursts induced by key stratum breaking based on microseismic monitoring. Chin J Rock Mech Eng 38:803–814. https://doi.org/10.13722/j.cnki.jrme.2018.1423
Guo WB, Lou GZ (2018) Definition and distinguishing method of critical mining degree of overburden failure. J China Coal Soc 44(3):755–766. https://doi.org/10.13225/j.cnki.jccs.2018.6038
He X, Zhao YX, Zhang C, Han PH (2020) A model to estimate the height of the water-conducting fracture zone for longwall panels in Western China. Mine Water Environ 39(4):1–16. https://doi.org/10.1007/s10230-020-00726-2
Hou GY, Hu T, Li ZX, Xie BB, Zhou XHL, TC, (2020) Fiber optic strain characterization of “two zones” deformation of overburden mining based on BOFDA. J Min Saf Eng 37:224–237. https://doi.org/10.13545/j.cnki.jmse.2020.02.002
Hu T, Hou G, Bu S, Zhu Z, Wang Y, Hu ZY, Li ZX (2020a) A novel approach for predicting the height of water-conducting fracture zone under the high overburden caving strength based on optimized processes. Processes 8(8):950. https://doi.org/10.3390/pr8080950
Hu T, Hou G, Li Z (2020b) The field monitoring experiment of the roof strata movement in coal mining based on DFOS. Sensors 20(5):1318. https://doi.org/10.3390/s20051318
Huang BX, Liu CY, Xu JL (2010) Research on through degree of overlying strata fracture fissure induced by mining. J China U Min Techno 39(1):45–49
Huang WP, Li C, Zhang LW, Yuan Q, Zheng YS, Liu Y (2018) In situ identification of water-permeable fractured zone in overlying composite stratum. Int J Rock Mech Min Sci 105:85–97. https://doi.org/10.1016/j.ijrmms.2018.03.013
Karacan C, Goodman G (2009) Hydraulic conductivity changes and influencing factors in longwall overburden determined by slug tests in gob gas ventholes. Int J Rock Mech Min Sci 46(7):1162–1174. https://doi.org/10.1016/j.ijrmms.2009.02.005
Li Z, Xu Y, Li L, Zhai C (2015) Forecast of the height of water flowing fractured zone based on BP neural networks. J Min Safety Eng 32:905–910. https://doi.org/10.13545/j.cnki.jmse.2015.06.006
Liang Z, Song W, Liu W (2020) Theoretical models for simulating the failure range and stability of inclined floor strata induced by mining and hydraulic pressure. Int J Rock Mech Min Sci 132:104382. https://doi.org/10.1016/j.ijrmms.2020.104382
Liu SL, Li WP, Wang QQ, Pei YB (2018) Investigation on mining-induced fractured zone height developed in different layers above Jurassic coal seam in western China. Arab J Geosci 11(2):30. https://doi.org/10.1007/s12517-018-3383-z
Liu X, Tan Y, Ning J, Tian C, Wang J (2015) The height of water-conducting fractured zones in longwall mining of shallow coal seams. Geotech Geol Eng 33:693–700. https://doi.org/10.1007/s10706-015-9851-2
Liu Y, Liu QM, Li WP, Li T, He JH (2019) Height of water-conducting fractured zone in coal mining in the soil–rock composite structure overburdens. Environ Earth Sci 78(7):242. https://doi.org/10.1007/s12665-019-8239-7
Majdi A, Hassani F, Nasiri M (2012) Prediction of the height of destressed zone above the mined panel roof in longwall coal mining. Int J Coal Geol 98:62–72. https://doi.org/10.1016/j.coal.2012.04.005
Qian MG, Shi PW, Xu JL (2010) Mine pressure and strata control. China University of Mining and Technology Press, Xuzhou
Ren Z, Wang N (2020) The overburden strata caving characteristics and height determination of water conducting fracture zone in fully mechanized caving mining of extra thick coal seam. Geotech Geol Eng 38(1):329–341. https://doi.org/10.1007/s10706-019-01019-4
Sun Y, Zuo J, Karakus M, Wang J (2019) Investigation of movement and damage of integral overburden during shallow seam mining. Int J Rock Mech Min Sci 117:63–75. https://doi.org/10.1016/j.ijrmms.2019.03.019
Sun YJ, Zuo JP, Murat K, Jinhao W (2020) A novel method for predicting movement and damage of overburden caused by shallow coal mining. Rock Mech Rock Eng 53(4):1545–1563. https://doi.org/10.1007/s00603-019-01988-1
Wang F, Xu J, Chen S, Ren MZ (2019) Method to predict the height of the water conducting fractured zone based on bearing structures in the overlying strata. Mine Water Environ 38(4):767–779. https://doi.org/10.1007/s10230-019-00638-w
Wang YG, Guo WB, Bai EH, Zhang ZY, Kang YP, Chai HB, Chen JJ (2018) Characteristics and mechanism of overlying strata movement due to high-intensity mining. J China Coal Soc 43(S1):28–35. https://doi.org/10.13225/j.cnki.jccs.2017.1423
Wei JC, Wu FZ, Yin HY, Guo JB, Xie DL, Xiao LL, Zhi HF, Lefticariu L (2017) Formation and height of the interconnected fractures zone after extraction of thick coal seams with weak overburden in Western China. Mine Water Environ 36(1):59–66. https://doi.org/10.1007/s10230-016-0396-2
Wu BY, Deng ZG, Feng YF (2017a) Li F (2017a) analysis of the influence of interlayer rock on ascending mining under special conditions. J China Coal Soc 42(4):842–848. https://doi.org/10.13225/j.cnki.jccs.2016.0621
Wu YP, Gao XC (2010) Experimental comparative study on lateral deformation characteristics of coal sample in different loading path. J China Coal Soc 35(S0):44–48. https://doi.org/10.13225/j.cnki.jccs.2010.s1.015
Wu Q, Shen J, Liu W, Wang Y (2017b) A RBFNN-based method for the prediction of the developed height of a water-conductive fractured zone for fully mechanized mining with sublevel caving. Arab J Geosci 10(7):172. https://doi.org/10.1007/s12517-017-2959-3
Yang XB, Han XX, Liu EL, Zhang ZP, Wang TJ, Zhang LH (2018) Properties of non-uniform deformation evolution of rock under uniaxial cyclic loading and unloading. J China Coal Soc 43(2):449–456. https://doi.org/10.13225/j.cnki.jccs.2017.1119
Zhang KG (2016) Bearing Capacity of Spreading Foundation on Finite Element and Plastic Hinge Theory Analysis. Dissertation, Chongqing University
Zhang TJ, Zhang L, Li SG, Zhang C, Song S, Bao RY (2017) Characteristics of the surface deformation of specimens with a hole during the progressive failure. J China Coal Soc 42(10):2623–2630. https://doi.org/10.13225/j.cnki.jccs.2017.0022
Zhang Y, Cao SG, Gao R, Guo S, Lan LX (2018) Prediction of the heights of the water-conducting fracture zone in the overlying strata of short wall block mining beneath aquifers in western China. Sustainability 10(5):1636. https://doi.org/10.3390/su10051636
Zhao CH, Jin DW, Wang H, Wang QM, Wang SD, Liu Y (2019a) 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
Zhao ZL, Jing HW, Shi XS, Han GS (2019b) Experimental and numerical study on mechanical and fracture behavior of rock-like specimens containing pre-existing holes flaws. Eur J Environ Civ En. https://doi.org/10.1080/19648189.2019.1657961
Zhong CM (2011) Research on movement and deformation rules of rock strata between coal seams in caving method up ward mining of left-over coal with numerical simulation. Dissertation, Taiyuan University of Technology
Zhu T, Li W, Wang Q, Fan K, Du J (2020) Study on the height of the mining-induced water-conducting fracture zone under the Q2l loess cover of the Jurassic coal seam in northern Shaanxi, China. Mine Water Environ 39(1):57–67. https://doi.org/10.1007/s10230-020-00656-z
Zhou Z (2017) Study on the development law of mining fracture and karst surface collapse when mining in karst area. Dissertation, Hunan University of Science And Technology
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This study was supported by The Fundamental Research Funds for the Central Universities (No. 2021YJSDC21).
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Liu, Y., Cheng, J., Jiao, J. et al. Feasibility study on multi-seam upward mining of multi-layer soft–hard alternate complex roof. Environ Earth Sci 81, 424 (2022). https://doi.org/10.1007/s12665-022-10537-z
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DOI: https://doi.org/10.1007/s12665-022-10537-z