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Nonlinear consolidation of vertical drains with coupled radial‐vertical flow considering time and depth dependent vacuum pressure
Author(s) -
Liu Sijie,
Geng Xueyu,
Sun Honglei,
Cai Yuanqiang,
Pan Xiaodong,
Shi Li
Publication year - 2019
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.2888
Subject(s) - consolidation (business) , compressibility , geotechnical engineering , pore water pressure , void ratio , mechanics , nonlinear system , permeability (electromagnetism) , materials science , geology , physics , chemistry , accounting , quantum mechanics , business , biochemistry , membrane
Summary The system of vacuum pressure combined with vertical drains to accelerate soil consolidation is one of the most effective ground improvement methods. The consolidation theories of soft soil improved by vertical drains including void ratio–dependent compressibility and permeability have been widely applied in practice to predict the consolidation behavior. In this paper, analytical solutions of the consolidation of vertical drains are derived incorporating the loss and propagating stage of vacuum pressure. In addition, special solutions are obtained for the cases of instantaneous surcharge loading and staged surcharge loading, based on the general solution. The solution is verified by ignoring the propagating stage of vacuum pressure formation and comparing it with an existing solution. The effects of vacuum pressure loss and propagating stage combined with other parameters are investigated through the ratio between excess pore water pressure and surcharge loading.