Abstract
Underground mining of coal resources deep below the surface of the earth requires the excavation of deep shafts. The thickness of the Cenozoic in a minefield in Shandong, China, exceeds 700 m, which is one of the mines with the largest thickness of loose layers. The large thickness of the layer has made the excavation of the mineshaft and its subsequent maintenance difficult. In order to understand the state change of deep large thickness geotechnical loose layers after disturbance and the impact on engineering, a large number of clay samples of different depths from the surface to more than 700 m were obtained. The influence of shaft excavation on the physico-mechanical properties of deep clay was studied through systematic tests. The test results indicated that the physical properties of deep clay soil do not change significantly as the soil depth increases and that soil dispersion was large because of the disturbance caused to the clay sample during sampling. The deep clay structure is obvious, and microscopic cracks are generally developed. After loading–unloading compression and water expansion had occurred, the original clay structure displayed significant damage, and the cracks in the sample displayed an uneven expansion. The number and width of the cracks have significantly increased compared with those of the original sample. Thus, soil disturbance due to shaft excavation and soil expansion due to water immersion will lead to the destruction of the original structure of clay, and shaft excavation will have a significant impact on the structure of deep clay.
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References
Atterberg A (1911) Über die physikalische Bodenuntersuchung und über die Plastizit¨at der Tone. Int Mitteilungen Für Bodenkunde 1:10–43
Cao ZD, Gu QX, Huang Z, Fu JJ (2022) Risk assessment of fault water inrush during deep mining. Int J Min Sci Techno 32(2):423–434. https://doi.org/10.1016/j.ijmst.2022.01.005
Chen GQ, Wang YS, Leng YG, Zhang CH (2014) Experimental study on unloading mechanical properties of long-term high pressure K_0 consolidated clay. Chin J Rock Mech Eng 33:2996–3002. https://doi.org/10.13722/j.cnki.jrme.2014.s1.057
Cui GX (1999) The basic theory for analyzing loads on underground structure in deep alluvium – mechanics of deep soil. J China Coal Soc 24:123–126. https://doi.org/10.1088/0256-307X/16/9/020
Di Remigio G, Rocchi I, Zania V (2021) Scanning electron microscopy and clay geomaterials: from sample preparation to fabric orientation quantification. Appl Clay Sci 214:106249. https://doi.org/10.1016/j.clay.2021.106249
Guggenheim S, Martin RT (1995) Definition of clay and clay mineral: joint report of the AIPEA nomenclature and CMS nomenclature committees. Clay Clay Miner 43(2):255–256. https://doi.org/10.1346/CCMN.1995.0430213
Hou XL, Zhou JH, Zhao XB (2011) Research on unloading rebound deformation of muddy silty clay at Hexi district in Nanjing city. J Disaster Prev Mitig Eng 31:397–402. https://doi.org/10.13409/j.cnki.jdpme.2011.04.006
Huang Z, Gu QX, Wu YF, Wu Y, Li SJ, Zhao K, Zhang R (2021) Effects of confining pressure on acoustic emission and failure characteristics of sandstone. Int J Min Sci Techno 31(5):963–974. https://doi.org/10.1016/j.ijmst.2021.08.003
Huang Z, Wu Y, Zhang R, Zhong W, Li SJ, Zhang CL (2022) Experimental investigation on the grouting characteristics of fractured sandstones under different confining pressures. Geomech Geophys Geo 8(6):201. https://doi.org/10.1007/s40948-022-00512-0
Huang Z, Zeng W, Zhao K (2019) Experimental investigation of the variations in hydraulic properties of a fault zone in Western Shandong, China. J Hydrol 574:822–835. https://doi.org/10.1016/j.jhydrol.2019.04.063
Jiang YK, Sun RH (2012) Experimental study on permeability of deep clay. Chin J Geotech Eng 34:268–273
Li WP (2000) Testing and theoretical studies on the interaction between soil and shaft wall during deep soil compression due to losing water. Chin J Geotech Eng 22:475–480. https://doi.org/10.3321/j.issn:1000-4548.2000.04.018
Li WP, Wang WL, Zhang ZY, Li YS, Sun RH (2004) Study on the characteristics of deformation and strength of a deep clay under triaxial high pressure unloading test. J Eng Geol 12:307–311. https://doi.org/10.3969/j.issn.1004-9665.2004.03.016
Moreno-Maroto JM, Alonso-Azcárate J, O’Kelly BC (2021a) Review and critical examination of fine-grained soil classification systems based on plasticity. Appl Clay Sci 200:105955. https://doi.org/10.1016/j.clay.2020.105955
Moreno-Maroto JM, Alonso-Azcárate J, O’Kelly BC (2021b) Reply to discussion on “Review and critical examination of fine-grained soil classification systems based on plasticity” by J. M. Moreno-Maroto, J. Alonso-Azcárate and B. C. O’Kelly, Applied Clay Science 200 (2021) 105955. Appl Clay Sci 206:106074. https://doi.org/10.1016/j.clay.2021.106074
O’Kelly BC, Vardanega PJ, Haigh SK (2022) Discussion of “Mohajerani method: Tool for determining the liquid limit of soils using fall cone test results with strong correlation with the Casagrande test” by E. Hrubesova, B. Lunackova and M. Mohyla [Engineering Geology 278 (2020) 105852]. Eng Geol 302:106623. https://doi.org/10.1016/j.enggeo.2022.106623
Polidori E (2015) Proposal for a new classification of common inorganic soils for engineering purposes. Geotech Geol Eng 33(6):1569–1579. https://doi.org/10.1007/s10706-015-9922-4
Prakash K, Sridharan A (2021) Discussion on review and critical examination of fine-grained soil classification systems based on plasticity {Authored by Moreno-Maroto, JM, Alonso-Azcárate, J. and O’Kelly, BC, Applied Clay Science, vol. 200, No. 1, pp. 1–13}. Appl Clay Sci 206:106008. https://doi.org/10.1016/j.clay.2021.106008
Qi QX, Pan YS, Shu LY (2018) Theory and technical framework of prevention and control with different sources in multi-scales for coal and rock dynamic disasters in deep mining of coal mines. J China Coal Soc 43:1801–1810. https://doi.org/10.13225/j.cnki.jccs.2018.0660
Shang XY, Yu HS, Zhou GQ, Wang F, Lu Y (2012) Micro analysis of mechanical characteristics of deep clay under high stress level. Chin J Geotech Eng 34:363–368
Sun Q, Jiang ZQ, Li YM, Zhu SY (2012) Experimental study on microscopic properties of deep clay in Wanfu well field. J China Coal Soc 37:2026–2030. https://doi.org/10.13225/j.cnki.jccs.2012.12.002
Wang DL, Sui WH (2012) Grout diffusion characteristics during chemical grouting in a deep water-bearing sand layer. Int J Min Sci Technol 22:589–593. https://doi.org/10.1016/j.ijmst.2012.02.003
Wang YS, Jia JB, Chen GQ, Wen K (2017) Experimental study on long-term high-pressure K0 consolidation of deep remolded clay. J Min Saf Eng 34:1169–1178. https://doi.org/10.13545/j.cnki.jmse.2017.06.020
Xie HP, Gao F, Ju Y (2015) Research and development of rock mechanics in deep ground engineering. Chin J Rock Mech Eng 34:2161–2178. https://doi.org/10.13722/j.cnki.jrme.2015.1369
Xie HP, Gao F, Ju Y (2017) Theoretical and technological conception of the fluidization mining for deep coal resources. J China Coal Soc 42:547–556. https://doi.org/10.13225/j.cnki.jccs.2017.0299
Xie HP, Ju Y, Gao MZ, Gao F, Liu JZ, Ren HW, Ge SR (2018) Theories and technologies for in-situ fluidized mining of deep underground coal resources. J China Coal Soc 43:1210–1219. https://doi.org/10.13225/j.cnki.jccs.2018.0519
Xu YC (2004) Mechanics characteristics of deep saturated clay. J China Coal Soc 29:26–30. https://doi.org/10.3321/j.issn:0253-9993.2004.01.006
Yang JM, Li J (2014) A practical method for calculating layerwise rebound at the bottom of foundation pit. Rock Soil Mech 35:1413–1420. https://doi.org/10.16285/j.rsm.2014.05.039
Yang WH, Li F, Wang ZS, Huang JH (2007) Field measurements for strains in shaft lining in alluvium during drainage and grouting. Chin J Rock Mech Eng 26:2713–2717. https://doi.org/10.3321/j.issn:1000-6915.2007.z1.018
Yuan HP, Han ZY, Lin H, Wang B, Chen SM (2014) Rcbond effect of rock & soil excavation based on M-C elastic-plastic consititutive model. Chin J Geotech Eng 36:24–29. https://doi.org/10.11779/CJGE2014S2005
Yuan L (2021) Research progress of mining response and disaster prevention and control in deep coal mines. J China Coal Soc 46:716–725. https://doi.org/10.13225/j.cnki.jccs.YT21.0158
Zhang B, Yang WH, Wang BS (2018a) Plastic design theory of frozen wall thickness in an ultradeep soil layer considering large deformation characteristics. Math Probl Eng 2018:8513413. https://doi.org/10.1155/2018/8513413
Zhang JX, Zhang Q, Ju F, Zhou N, Li M, Sun Q (2018b) Theory and technique of greening mining integrating mining, separating and backfilling in deep coal resources. J China Coal Soc 43:377–389. https://doi.org/10.13225/j.cnki.jccs.2017.4102
Zhang X, Liu SY, Wu K, Cai GJ, Lu TS (2021) Numerical simulation analysis of the effect of engineering piles on the rebound deformation of foundation pits. Chin J Geotech Eng 43:11–14
Zhang ZP, Gao MZ, Zhang ZT, Zhang R, Li G (2015) Research on permeability characteristics of raw coal in complete stress-strain process under different gas pressure. J China Coal Soc 40:836–842. https://doi.org/10.13225/j.cnki.jccs.2014.3018
Zhao Y, Lu Z, Yao HL, Gu F, Duan YH (2020) Experimental study of dynamic resilient modulus of subgrade soils under coupling of freeze-thaw cycles and dynamic load. J Cent South Univ 27:2043–2053. https://doi.org/10.1007/s11771-020-4429-4
Zhou GQ, Kuang LF, Ma JR, Shang XY, Zhao XD (2016) Status quo and prospects of the deep soil mechanical properties. J China Univ Min Technol 45:195–204. https://doi.org/10.13247/j.cnki.jcumt.000472
Zhou ZA, Li ZQ, Yang WM (2005) Analysis of engineering geological characteristics of shaft wall within deep thick clay layer. Coal Geol Explor 01:52–54. https://doi.org/10.3969/j.issn.1001-1986.2005.01.017
Funding
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (52274082, 52064016); the Jiangxi Provincial Natural Science Foundation (20202ACB214006); the Innovative Experts, Long-term Program of Jiangxi Province (jxsq2018106049); the Supported by Program of Qingjiang Excellent Young Talents, Jiangxi University of Science and Technology (JXUSTQJBJ2020003); and the Jiangxi Key Research and Development Program (No. 20212BBG71009).
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Writing, original draft, and investigation, Y.L. and Zhen Huang; conceptualization, writing, original draft, and data curation, Z.H. and C.G.; supervision and writing, review, Z.J.; supervision, K.Z. and Q.G.; and resources and data curation, Y.F. and R.Z. All the authors have read and agreed to the published version of the manuscript.
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Lin, Y., Huang, Z., Jiang, Z. et al. Investigation of physical and mechanical properties of clay soils around deep shafts. Bull Eng Geol Environ 82, 221 (2023). https://doi.org/10.1007/s10064-023-03212-5
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DOI: https://doi.org/10.1007/s10064-023-03212-5