Abstract
Reasonable retention of safe coal and rock pillars is significant for safe mining and liberating coal resources under thick loose aquifers. The 18,041 working face of Chengcun Mine is taken as the research background. The elastic foundation model of the rock-clay synergistic aquiclude was creatively constructed, and the structural instability criterion was derived. The dynamic evolution law of thin bedrock failure and the vertical settlement law of clay layer are studied by numerical simulation test. A similar material simulation test is used to simulate the development law of water flowing fractured zone and the evolution law of vertical displacement of rock strata under the condition of fluid–solid coupling and to verify the stability of rock-clay synergistic water-resisting structure. The research shows that: (1) The maximum tensile stress in the middle of the long side of the rock stratum at the top of the bedrock is 0.652 MPa, less than its tensile strength threshold. (2) The clay and rock layers at the top of the bedrock have a synergistic settlement. The vertical settlement distribution transitions from a 'concentric circle' to a 'concentric ellipse'. The maximum deformation value in the central area is 0.5 m. (3) The development of water-conducting fractures under the thick loose layer and thin bedrock presents a 'double peak and one valley' shape, with a maximum height of 45.2 m. The rock-clay synergistic water-resisting structure maintains the effective water-resisting property, thus verifying the feasibility of the 4 m mining scheme.
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References
An B, Li N, Yi Q et al (2021) Nonlinear elastic foundation plate model study on overlying strata movement in working face with solid backfilling mining. Shock Vib 2021:1–14. https://doi.org/10.1155/2021/4829761
Arasteh H, Esmaeili K, Saeedi G et al (2022) Discontinuous modeling of roof strata caving in a mechanized longwall mine in tabas coal mine. Int J Geomech 22(5):04022040
Attom MF, Vandanapu R, Khan Z et al (2024) Prediction of internal erosion parameters of clay soils using initial physical properties. Water 16(2):232. https://doi.org/10.3390/w16020232
Bazaluk O, Rysbekov K, Nurpeisova M et al (2022) Integrated monitoring for the rock mass state during large-scale subsoil development. Front Environ Sci 10:329. https://doi.org/10.3389/fenvs.2022.852591
Brook M, Hebblewhite B, Mitra R (2020) Coal mine roof rating (CMRR), rock mass rating (RMR) and strata control: Carborough Downs Mine, Bowen Basin, Australia. Int J Min Sci Technol 30(2):225–234. https://doi.org/10.1016/j.ijmst.2020.01.003
Chen B, Zhang S (2021) Experimental study on water and sand inrush of mining cracks in loose layers with different clay contents. Bull Eng Geol Environ 80:663–678. https://doi.org/10.1007/s10064-020-01941-5
Cheng G, Chen C, Ma T (2017) A case study on the strata movement mechanism and surface deformation regulation in Chengchao underground iron mine. Rock Mech Rock Eng 50:1011–1032. https://doi.org/10.1007/s00603-016-1132-8
Das AJ, Mandal PK, Paul PS et al (2019) Assessment of the strength of inclined coal pillars through numerical modelling based on the ubiquitous joint model. Rock Mech Rock Eng 52:3691–3717. https://doi.org/10.1007/s00603-019-01826-4
Fan H, Wang LG, Lu YL (2020) Height of water-conducting fractured zone in a coal seam overlain by thin bedrock and thick clay layer: a case study from the Sanyuan coal mine in North China. Environ Earth Sci 79:125. https://doi.org/10.1007/s12665-020-8873-0
Fan Z, Fan K, Liu Z et al (2021) Experimental study on the mining-induced water-resistance properties of clay aquicludes and water conservation mining practices. Adv Civil Eng 2021:1–12. https://doi.org/10.1155/2021/4868998
Fei Y, Liu S, Xu Y et al (2020) Failure analysis of thin bedrock and clay roof in underground coal mining: case study in Longdong coal mine. Int J Geomech 20(10):04020187. https://doi.org/10.1061/(ASCE)GM.1943-5622.0001839
Galav A, Singh GSP, Sharma SK (2022) A numerical modeling approach for assessment of seepage characteristics and performance of protective water barrier pillars in underground coal mines. Min Metall Explor 39(5):2047–2063. https://doi.org/10.1007/s42461-022-00672-3
Ghabraie B, Ren G, Zhang X et al (2015) Physical modelling of subsidence from sequential extraction of partially overlap** longwall panels and study of substrata movement characteristics. Int J Coal Geol 140:71–83. https://doi.org/10.1016/j.coal.2015.01.004
Hasim R, Jaiswal A, Shrivastva B (2018) Estimation of rock load height during development operation in bord and pillar coal mine using numerical simulation method. Modell Meas Control C 79(2):24–34
Hu Y, Gui H, Ma T (2023) Stability criteria for a composite clay-overlying strata aquiclude during mining under a loose pressurized aquifer. Geotech Geol Eng 41(2):1339–1352
Ip SC, Borja RI (2022) Evolution of anisotropy with saturation and its implications for the elastoplastic responses of clay rocks. Int J Numer Anal Meth Geomech 46(1):23–46. https://doi.org/10.1002/nag.3289
Kantesaria N, Sachan A (2022) Strain energy, yielding and undrained shear characteristics of high plasticity compacted clay subjected to stress anisotropy. Geotech Geol Eng 40:213–236. https://doi.org/10.1007/s10706-021-01897-7
Keawsawasvong S, Shiau J, Limpanawannakul K et al (2022) Stability charts for closely spaced strip footings on Hoek–Brown rock mass. Geotech Geol Eng 40(6):3051–3066. https://doi.org/10.1007/s10706-022-02077-x
Li T, Tang Y, Li L et al (2023) Study of the catastrophic process of water–sand inrush in a deep buried stope with thin bedrock. Water. https://doi.org/10.3390/w15152847
Li QW, Shen JJ, Zhang HD et al (2024) Characteristics of overlying rock mining failure and evaluation of water-sand controlling performance in thin bedrock areas. Coal Sci Technol, 1011–1032. http://kns.cnki.net/kcms/detail/11.2402.TD.20240104.1452.002.html
Lin Y, Huang Z, Jiang Z et al (2023) Investigation of physical and mechanical properties of clay soils around deep shafts. Bull Eng Geol Env 82(6):1–15. https://doi.org/10.1007/s10064-023-03212-5
Meng Y, **g H, Yin Q (2020) Experimental study on seepage characteristics and water inrush of filled karst structure in tunnel. Arab J Geo Sci 13:450. https://doi.org/10.1007/s12517-020-05474-9
Mohammadi S, Ataei M, Kakaie R et al (2021) A probabilistic model to determine main caving span by evaluating cavability of immediate roof strata in longwall mining. Geotech Geol Eng 39:2221–2237. https://doi.org/10.1007/s10706-020-01620-y
Ni T, Pesavento F, Zaccariotto M et al (2021) Numerical simulation of forerunning fracture in saturated porous solids with hybrid fem/peridynamic model. Comput Geotech 133:104024
Paul A, Murthy VMSR, Prakash A et al (2020) Estimation of rock load for junctions based on roof failure cases for safe mining operation. Arab J Geosci 13:1–10. https://doi.org/10.1007/s12517-020-06045-8
Pidho JJ, Batte AG, AlTammar MJ et al (2023) Inclusion of anisotropy in understanding rock deformation and inter-well fracture growth in layered formation through CZM based XFEM. Geoenergy Sci Eng 227:211863. https://doi.org/10.1016/j.geoen.2023.211863
Prakash A, Kumar N, Kumbhakar D et al (2018) A safe depillaring design for shallow depth of cover with influence of surface ground movements: a study in Jharia Coalfield. Arab J Geosci 11(8):164. https://doi.org/10.1007/s12517-018-3508-4
Prime N, Levasseur S, Miny L et al (2015) Drying-induced shrinkage of Boom clay: an experimental investigation. Can Geotech J 53(3):396–409. https://doi.org/10.1007/s10706-023-02582-7
Shi X, **g H, Zhao Z (2020) Structural characteristics of the overlying strata in a fully mechanized longwall face with the low-position thick-hard roof. Geotech Geol Eng 38:4767–4777. https://doi.org/10.1007/s10706-020-01326-1
Wu G, Bai H, Du B (2019) Study on the failure mechanism of clay layer overlying thin bedrock in coal seam mining. Environ Earth Sci 78:315. https://doi.org/10.1007/s12665-019-8306-0
Yang Y, Li Y, Wang L et al (2023) On strata damage and stress disturbance induced by coal mining based on physical similarity simulation experiments. Sci Rep 13:15458. https://doi.org/10.1038/s41598-023-42148-4
Zhao Z, Wang H, Han L, Zhao Z (2023) Study of water–sand inrush through a vertical karst conduit uncovered through tunnel excavation. Water 15:2010. https://doi.org/10.3390/w15112010
Zhu G, Wang S, Zhang W (2022) Fluid-solid coupling materials to similar simulation test on water inrush in geotechnical and mining engineering. Geotech Geol Eng 40(12):5755–5768. https://doi.org/10.1007/s10706-022-02246-y
Funding
This research was funded by the National Natural Science Foundation of China (Grant 52304238), the Natural Science Foundation of Shandong Province (Grant ZR2023ME002), and the SDUST Research Fund (Grant 2018TDJH102).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by WL, JS, JZ and HL. The first draft of the manuscript was written by WL, JS, JZ and HL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Liu, W., Li, H., Zhao, J. et al. Deformation and Stability in Coal Seam Mining Under Fluid–Solid Coupling. Geotech Geol Eng (2024). https://doi.org/10.1007/s10706-024-02783-8
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DOI: https://doi.org/10.1007/s10706-024-02783-8