Abstract
Due to the presence of the hard suspended roof, it cannot collapse naturally after the coal seam is mined. If the roof strata are suddenly destroyed without human intervention, it will cause serious geologic disasters. In this paper, we discuss the mechanisms and applications of hydraulic fracturing in alleviating the potential for catastrophic disasters. After preliminary analysis of fracturing crack propagation law, we investigate the failure and stress characteristics of overburden with and without fracturing, taking a coal mine in Dongsheng mining area as an example. The results show that the hard roof suffers severe damage after fracturing, and the initial rupture distance of the hard roof is reduced to about 40.0 m. Besides, the development height of the water-conducting fissure zone is approximately 138.18 m. The fracturing effect can be preliminarily speculated according to fluid pressure change curves. It is inferred that hydraulic fracturing point 3 has the best fracturing effect on hard-suspended roofs. On the other hand, we find the most overburden at the monitoring sites essentially bear compressive stress in fracturing and non-fracturing conditions, and a common trait of overburden stress is easily observed, namely, that overburden stress after fracturing shows a relatively smaller value than that of non-fracturing condition, and the overburden stress reduction is more significant at the goaf center and near the stop** site. The study provides theoretical support for the safety management of thick hard roofs, especially in the coal mines seriously affected by roof accidents.
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References
Adachi J, Siebrits E, Peirce A, Desroches J (2007) Computer simulation of hydraulic fractures. Int J Rock Mech Min Sci 44(5):739–757. https://doi.org/10.1016/J.IJRMMS.2006.11.006
Cai QW, Huang BX, Zhao XL, **ng YK, Liu SL (2023) Experimental investigation on the morphology of fracture networks in hydraulic fracturing for coal mass characterized by x-ray micro-computed tomography. Rock Mech Rock Eng 56(4):2551–2571. https://doi.org/10.1007/s00603-022-03210-1
Cao WZ, Yildirim B, Durucan S, Wolf K-H, Cai W, Agrawal H, Korre A (2021) Fracture behaviour and seismic response of naturally fractured coal subjected to true triaxial stresses and hydraulic fracturing. Fuel 288:119618. https://doi.org/10.1016/j.fuel.2020.119618
Cui F, Zhang TH, Lai XP, Cao JT, Shan PF (2019) Study on the evolution law of overburden breaking angle under repeated mining and the application of roof pressure relief. Energies 12:4513. https://doi.org/10.3390/en12234513
De Graaf WW, Spiteri W (2018). A preliminary qualitative evaluation of a hydraulic splitting cylinder for breaking rock in deep-level mining. J S Afr Inst Min Metall 118(8):891–897. https://doi.org/10.17159/2411-9717/2018/v118n8a13
Gu ST, Chen HX, Li WS, Jiang BY, Chen X (2022) Study on occurrence mechanism and prevention technology of rock burst in narrow coal pillar working face under large mining depth. Sustainability 14:15435. https://doi.org/10.3390/su142215435
Guo DY, Lv PF, Zhao JC, Zhang C (2020) Research progress on permeability improvement mechanisms and technologies of coalbed deep-hole cumulative blasting. Int J Coal Sci Technol 7(2):329–336. https://doi.org/10.1007/s40789-020-00320-5
Hu JH, Lei T, Zhou KP, Liu L, Lao DZ (2014) Mechanism on simulation and experiment of pre-crack seam formation in stope roof. J Cent South Univ 21:1526–1533. https://doi.org/10.1007/s11771-014-2093-2
Huang BX, Cheng QY, Zhao XL, Xue WC, Scoble M (2018) Using hydraulic fracturing to control caving of the hanging roof during the initial mining stages in a longwall coal mine: a case study. Arab J Geosci 11:603. https://doi.org/10.1007/s12517-018-3969-5
Jiang JY, Yang WH, Cheng YP, Lv BM, Zhang K, Zhao K (2018) Application of hydraulic flushing in coal seams to reduce hazardous outbursts in the Meng** mine. China Environ Eng Geosci 24(4):425–440. https://doi.org/10.2113/EEG-2110
Kamal A, Elsheikh A, Showaib E (2020) Pre-Cracking techniques of polymeric materials: an overview. IOP Conf Ser Mater Sci Eng 973:012028. https://doi.org/10.1088/1757-899X/973/1/012028
Kang HP, Lv HW, Gao FQ, Meng XZ, Feng YJ (2018) Understanding mechanisms of destressing mining-induced stresses using hydraulic fracturing. Int J Coal Geol 196:19–28. https://doi.org/10.1016/j.coal.2018.06.023
Kang HP, Wu L, Gao FQ, Lv HW, Li JZ (2019) Field study on the load transfer mechanics associated with longwall coal retreat mining. Int J Rock Mech Min 124:104141. https://doi.org/10.1016/j.ijrmms.2019.104141
Kang HP, Jiang PF, Feng YJ, Gao FQ, Zhang Z, Liu XG (2023) Application of large-scale hydraulic fracturing for reducing mining-induced stress and microseismic events: a comprehensive case study. Rock Mech Rock Eng 56(2):1399–1413. https://doi.org/10.1007/s00603-022-03061-w
Li T, Zhang L, Jiang Q, Feng C, Zhao R (2021) Safe thickness and fracture evolution law determined for hydraulic fracturing of water-resistant rock mass with hidden karst based on Gdem. Tunn Constr 41:67–76
Li JW, Fu BJ, Zhang HL, Zhao QC, Bu QW (2023) Study on fracture behavior of directly covered thick hard roof based on bearing capacity of supports. Appl Sci 13:2546. https://doi.org/10.3390/app13042546
Liu JW, Wu N, Si GY, Zhao MX (2021) Experimental study on mechanical properties and failure behaviour of the pre-cracked coal-rock combination. Bull Eng Geol Environ 80(3):2307–2321. https://doi.org/10.1007/s10064-020-02049-6
Long TW, Hou EK, **e XS, Fan ZG, Tan EM (2022) Study on the damage characteristics of overburden of mining roof in deeply buried coal seam. Sci Rep 12:11141. https://doi.org/10.1038/s41598-022-15220-8
López-Comino JÁ, Cesca S, Niemz P, Dahm T, Zang A (2021) Rupture directivity in 3d inferred from acoustic emissions events in a mine-scale hydraulic fracturing experiment. Front Earth Sci 9:670757. https://doi.org/10.3389/feart.2021.670757
Lu YY, Gong T, **a BW, Yu B, Huang F (2019) Target stratum determination of surface hydraulic fracturing for far-field hard roof control in underground extra-thick coal extraction: a case study. Rock Mech Rock Eng 52:2725–2740. https://doi.org/10.1007/s00603-018-1616-9
Luo HY, Liang S, Yao QL, Hao YS, Li XH, Wang FR, Chen XY, Yang M (2022) Mechanism and application of hydraulic fracturing in the high-level thick and hard gangue layer to improve top coal caving in fully mechanized caving mining of an ultra-thick coal seam. Minerals 12:1605. https://doi.org/10.3390/min12121605
Mazaira A, Konicek P (2015) Intense rockburst impacts in deep underground construction and their prevention. Can Geotech J 52(10):1426–1439. https://doi.org/10.1139/cgj-2014-0359
Park JO, Woo I (2019) Field tests of hydraulic rock splitting technique using arrays of injection holes with guide slots. J Eng Geol 29:405–415. https://doi.org/10.9720/kseg.2019.4.405
Pei XL, Huang LW, Yang PZ, Feng C, Zhu XG, Li FN, Cheng PD (2021) Numerical simulation of the open-pit mine goafs control effect by means of dilapidation using blasting method. J Water Resour Archit Eng 19(5):87–91
Peng S, Cheng JY, Du F, Xue YT (2019) Underground ground control monitoring and interpretation, and numerical modeling, and shield capacity design. Int J Min Sci Technol 29(1):79–85. https://doi.org/10.1016/j.ijmst.2018.11.026
Qian MG, Miao XX, Li LJ (1995) Mechanism for the fracture behaviors of main floor in longwall mining. Chin J Geotech Eng 17:55–62
Rashid H, Olorode O, Chukwudozie C (2022) An iteratively coupled model for flow, deformation, and fracture propagation in fractured unconventional reservoirs. J Petrol Sci Eng 214:110468. https://doi.org/10.1016/j.petrol.2022.110468
Salimzadeh S, Paluszny A, Zimmerman RW (2017) Three-dimensional poroelastic effects during hydraulic fracturing in permeable rocks. Int J Solids Struct 108:153–163. https://doi.org/10.1016/j.ijsolstr.2016.12.008
Sepehri M, Apel DB, Adeeb S, Leveille P, Hall RA (2020) Evaluation of mining-induced energy and rockburst prediction at a diamond mine in Canada using a full 3D elastoplastic finite element model. Eng Geol 266:105457. https://doi.org/10.1016/j.enggeo.2019.105457
Stacey TR (2016) Addressing the consequences of dynamic rock failure in underground excavations. Rock Mech Rock Eng 49(10):4091–4101. https://doi.org/10.1007/s00603-016-0922-3
Sun YX, Fu YK, Wang T (2021) Field application of directional hydraulic fracturing technology for controlling thick hard roof: a case study. Arab J Geosci 14(6):438. https://doi.org/10.1007/s12517-021-06790-4
Wang GF, Xu YX, Ren HW (2019) Intelligent and ecological coal mining as well as clean utilization technology in China: review and prospects. Int J Min Sci and Technol 29(2):161–169. https://doi.org/10.1016/j.ijmst.2018.06.005
Wang J, Yang JX, Wu FF, Hu TF, Faisal SA (2020) Analysis of fracture mechanism for surrounding rock hole based on water-filled blasting. Int J Coal Sci Technol 7(4):704–713. https://doi.org/10.1007/s40789-020-00327-y
Xu JZ, Zhai C, Qin L (2017) Mechanism and application of pulse hydraulic fracturing in improving drainage of coalbed methane. J Nat Gas Sci Eng 40:79–90. https://doi.org/10.1016/j.jngse.2017.02.012
Xu JZ, Zhai C, Ranjith PG, Sun Y, Guo JS, Ma Z, Ma HT, Qin L (2019) Investigation of the velocities of coals of diverse rank under water- or gas-saturated conditions for application in coalbed methane recovery. Geofluids 2019:1–14. https://doi.org/10.1155/2019/3729381
Zhang FT, Wang XY, Bai JB, Wu BW, Wang GH, Li JC, Chen DC (2022) Study on hydraulic fracture propagation in hard roof under abutment pressure. Rock Mech Rock Eng 55:6321–6338. https://doi.org/10.1007/s00603-022-02989-3
Zhao N, Meng LX, Wang LG, Zhang YB (2022) Numerical simulation of creep fracture evolution in fractured rock masses. Front Earth Sci 10:901742. https://doi.org/10.3389/feart.2022.901742
Zheng ZT, Xu Y, Li DS, Dong JH (2015) Numerical analysis and experimental study of hard roofs in fully mechanized mining faces under sleeve fracturing. Minerals 5:758–777. https://doi.org/10.3390/min5040523
Zheng KG, Liu Y, Zhang T, Zhu JZ (2021a) Mining-induced stress control by advanced hydraulic fracking under a thick hard roof for top coal caving method: a case study in the shendong mining area, China. Minerals 11:1405. https://doi.org/10.3390/min11121405
Zheng KG, Zhang T, Zhao JZ, Liu Y, Yu F (2021b) Evolution and management of thick-hard roof using goaf-based multistage hydraulic fracturing technology—a case study in western Chinese coal field. Arab J Geosci 14:876. https://doi.org/10.1007/s12517-021-07111-5
Acknowledgements
The authors are grateful for the technical services from Gdem Technology, Bei**g, Co., Ltd. during numerical simulation.
Funding
This work was supported by the National Natural Science Foundation of China (42372316), the project of “Enlisting and Leading” of China Coal (2022JB01), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX23_2760), the Fundamental Research Funds for the Central Universities (2023XSCX003), and the Graduate Innovation Program of China University of Mining and Technology (2023WLKXJ003).
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**gzhong Zhu: writing—original draft, methodology, investigation, visualization, project administration. Wen** Li: supervision, writing—review and editing, funding acquisition. Teng Bo: data collection. Yu Liu: visualization.
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Zhu, J., Li, W., Teng, B. et al. Failure characteristics of thick hard roof stratum under hydraulic pre-splitting and its application in a coal mine, Dongsheng mining area. Environ Earth Sci 83, 153 (2024). https://doi.org/10.1007/s12665-024-11505-5
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DOI: https://doi.org/10.1007/s12665-024-11505-5