Abstract
Non-uniform consolidation of dredged soil under the vacuum preloading and corresponding clogging effect were investigated by series tests. Water content and permeability of soil at different consolidation distances and time were measured during the vacuum preloading. The drainage water volume and drainage rate in the test were also recorded. Test results showed that the uniform soil became non-uniform once the vacuum preloading started. Permeability of soil near the drainage boundary decreased by 50–100 times at the very beginning of vacuum preloading, leading to a serious clogging effect that reduced the drainage rate of soil by around 90% at the same time. Non-uniformity and clogging effect of soil reached the peak value after 24–48 h vacuum preloading in different cases. Based on the test results and Ruth theory, it was found that lower water content, higher salt content, lower vacuum pressure and flocculant additive relieved the clogging effect and made the soil more uniform after the consolidation. Finally, comparison between test and analytical results clarified that the non-uniformity and clogging effect should be considered in the consolidation of soil under the vacuum preloading.
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The datasets generated for this study are available on request to the corresponding author.
References
Hansbo, S. (1981). Consolidation of fine-grained soils by prefabricated drains. Proc of the ICSMFE 3: 677–682.
Pyrah IC (1996) One dimensional consolidation of layered soils. Geotechnique 45(3):555–560
**e KH, **e XY, Wen J (2002) A study on one-dimensional nonlinear consolidation of double-layered soil. Comput Geotech 29(2):151–168
Basu D, Prezzi PBM (2006) Analytical solutions for consolidation aided by vertical drains. Geomech Geoeng 1(1):63–71
Walker R, Indraratna B (2006) Vertical drain consolidation with parabolic distribution of permeability in smear zone. J Geotech Geoenviron Eng 132(7):937–941
Chen GH, **e KH, Cheng YF, Xu Y (2011) Analytical solutions for consolidation of sand-drained ground considering variation of permeability coefficient in smeared zone. J Zhejiang University Eng Sci 45(4):665–670
Indraratna B, Zhong R, Fox PJ, Rujikiatkamjorn C (2016) Large-strain vacuum-assisted consolidation with non-Darcian radial flow incorporating varying permeability and compressibility. J Geotech Geoenviron Eng 143(1):04016088
Nguyen BP, Do TH, KimL YT (2020) Large-strain analysis of vertical drain-improved soft deposit consolidation considering smear zone, well resistance, and creep effects. Comput Geotech 123:103602
Pu HF, Yang P, Lu MM, Zhou Y, Chen JN (2020) Piecewise-linear large-strain model for radial consolidation with non-Darcian flow and general constitutive relationships. Comput Geotech 118:103327
Imai G, Tang Y (1992) A constitutive equation of one-dimensional consolidation derived from inter-connected tests. Soils Found 32(2):83–96
Watabe Y, Udaka K, Kobayashi M, Tabata T, Emura T (2008) Effects of friction and thickness on long-term consolidation behavior of Osaka Bay clays. Soils Found 48(4):547–561
Zhou Y, Chai JC (2017) Equivalent sear effect due to non-uniform consolidation surrounding a PVD. Geotechnique 25:101–110
Zhou Y, Khoteja D, Xu F (2019) Numerical study: influences of local radial consolidation for soft clay. Soil Mech Found Eng 56(3):157–163
Zhou Y, Xu F (2021) A novel semi-analytical method for evaluating average consolidation degree of a two-soil-layer deposit. Bull Eng Geol Env 81:13
Indraratna B, Rujikiatkamjorn C, Baral P, Ameratunga J (2019) Performance of marine clay stabilised with vacuum pressure: based on Queensland experience. J Rock Mech Geotech Eng 11(3):598–611
López-Acosta NP, Espinosa-Santiago AL, Pineda-Núñez VM, Ossa A, Mendoza MJ, Ovando-Shelley E, Botero E (2019) Performance of a test embankment on very soft clayey soil improved with drain-to-drain vacuum preloading technology. Geotext Geomembr 47(5):618–631
Stoltz G, Delmas P, Barral C (2019) Comparison of the behaviour of various geotextilesused in the filtration of clayey sludge: an experimental study. Geotext Geomembr 47(2):230–242
Wang P, Gu BW, Yang H, Yang XT, Yu Z (2021) Analysis method for consolidation of soil under vacuum preloading assisted by air booster. Mar Georesour Geotechnol. https://doi.org/10.1080/1064119X.2021.2001611
Wang, P., Yang, X.T., Zhang, J., Ge, X.Y. 2022. Vacuum consolidation of soil: clogging effect, varying permeability and compressibility. Proceedings of the Institution of Civil Engineers—Geotechnical Engineering. https://doi.org/10.1680/jgeen.21.00237.
Chen L, Zhang FH, Li ZP, An YY, Li YL (2016) Experimental study on radial consolidation of soil around drainage plate. Chin J Geotech Eng 38(1):163–168
Lei HY, Lu HB, Liu JJ, Zheng G (2017) Experimental study of the clogging of dredger fills under vacuum preloading. Int J Geomech 17(12):04017117
Shi L, Wang QQ, Xu SL, Pan XD, Sun HL, Cai YQ (2018) Numerical study on clogging of prefabricated vertical drain in slurry under vacuum loading. Granular Matter 20(4):74
Shi L, Jiang JW, Wang QQ, Xu SL, Yuan ZH, Pan XD (2021) Numerical study on movements of soil particles forming clogging layer during vacuum preloading of dredged slurry. Granular Matter 23:92
Deng YF, Liu L, Cui YJ, Feng Q, Chen X, He N (2019) Colloid effect on clogging mechanism of hydraulic reclamation mud improved by vacuum preloading. Can Geotech J 56(5):611–620
Cai YQ, **e ZW, Wang J, Wang P, Geng XY (2017) A new approach of vacuum preloading with booster PVDs to improve deep marine clay strata. Can Geotech J 54(4):547–560
Hu XP, Zhang WK, Fu HT, Wang J, Ni JF (2021) Clogging effect of prefabricated horizontal drains in dredged soil by air booster vacuum consolidation. Geotext Geomembr 49(6):1529–1538
Fu HT, Cai YQ, Wang J, Wang P (2017) Experimental study on the combined application of vacuum preloading-variable-spacing electro-osmosis to soft ground improvement. Geosynth Int 24(1):72–81
Lei HY, Hu Y, Lei SH, Qi ZY, Xu YG (2019) Analysis of microstructure characteristics of air-booster vacuum preloading for ultra-soft dredger fills. Rock Soil Mech 40(S1):32–40
Wang J, Cai YQ, Ma JJ, Chu J, Fu HT, Wang P, ** YW (2016) Improved vacuum preloading method for consolidation of dredged clay-slurry fill. J Geotech Geoenviron Eng 142(11):06016012
Mishra PN, Scheuermann A (2021) Ventilated well method for efficient dewatering of soft soils: experimental investigations. J Geotech Geoenviron Eng 147(11):04021112
Fu HT, Chai JC (2020) Performance of a winged PVD (WPVD) for vacuum consolidation of soft clayey deposits. Transp Geotech 24:1–9
Chai JC, Saito A, Hino T, Negami T (2022) Behaviour of winged PVD and the method for calculating its induced degree of consolidation. Int J Geosynth Ground Eng. https://doi.org/10.1007/s40891-022-00394-y
Wang P, Han YB, Wang J, Cai YQ, Geng XY (2019) Deformation characteristics of soil between prefabricated vertical drains under vacuum preloading. Geotext Geomembr 47(6):798–802
Zhou Y, Yang H, Wang P, Yang XT, Xu F (2022) Vacuum-induced lateral deformation around a vertical drain in dredged slurry. Geosynth Int. https://doi.org/10.1680/jgein.21.00006a
Chai JC, Zhou Y (2018) Method for considering the effect of nonuniform consolidation. Int J Geomech 18(2):97–98
Chai JC, Fu HT, Wang J, Shen SL (2020) Behaviour of a PVD unit cell under vacuum pressure and a new method for consolidation analysis. Comput Geotech 120:103415
Liu SJ, Cai YQ, Sun HL, Shi L, Pan XD (2021) Consolidation considering clogging effect under uneven strain assumption. Int J Geomech 21(1):04020239
Liu SJ, Sun HL, Geng XY, Cai YQ, Shi L, Deng YF, Cheng K (2022) Consolidation considering increasing soil column radius for dredged slurries improved by vacuum preloading method. Geotext Geomembr 50(3):535–544
ASTM. 2010b. Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). D2487 American society for testing and materials. Philadelphia.
Gu RG, Fang YG (2009) Experimental research on ion effects of ultrafine granular clay seepage. Rock Soil Mech 30(6):1595–1598
Wu YJ, Tran QC, Zhang XD, Lu YT, Xu JL, Zhang HQ (2022) Experimental investigation on the treatment of different typical marine dredged sludge by focculant and vacuum preloading. Arab J Geosci 15:642
Indraratna B, Rujikiatkamjor C, Sathananthan L (2005) Analytical and numerical solutions for a single vertical drain including the effects of vacuum preloading. Can Geotech J 42(4):994–1014
Guo X, **e KH, Deng YB (2014) Consolidation by prefabricated vertical drains with a threshold gradient. Math Probl Eng 9:410390
Tyler SW, Wheatcraft SW (1992) Fractal scaling of soil particle size distribution: analysis and limitations. Soil Sci Soc Am J 56:362–369
Yuan XQ, Wang Q, Sun T, **a YB, Chen HE, Song J (2012) Pore distribution characteristics of dredger fill during hierarchical vacuum preloading. J Jilin Univ 42(1):169–176
Taylor DW (1948) Fundamental of soil mechanics. JohnWiley and Sons Inc., New York
Ruth BF (1935) Studies in filtration, III derivation general filtration equations. Ind Eng Chem Res 27:708–723
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This study was supported by the National Natural Science Foundation of China (Grant No. 51778499).
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Wang, P., Wu, J., Ge, X. et al. Non-uniform Consolidation of Soil and Influence of Corresponding Clogging Effect During Vacuum Preloading. Int. J. of Geosynth. and Ground Eng. 8, 58 (2022). https://doi.org/10.1007/s40891-022-00402-1
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DOI: https://doi.org/10.1007/s40891-022-00402-1