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| Nonlinear radial consolidation theory for prefabricated vertical drain based on the equivalent elliptical cylinder model |
| TIAN Yi1，WU Wenbing1，2，KANG Cheng1，JIANG Guosheng1，MEI Guoxiong1，2，ZHOU Keqing1 |
| (1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；2. College of Civil Engineering and Architecture，Guangxi University，Nanning，Guangxi 530004，China) |
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Abstract Based on the equivalent elliptical cylinder model，by introducing the e-lgσ' and e-lgkh nonlinear relationships and the linear loss law of the negative pressure in the prefabricated vertical drain(PVD)，a numerical solution and a simplified analytical solution are obtained by the differential algorithm and the simplified method，respectively. On basis of the presented solutions，the comparative analyses between the numerical solution and the simplified solution，and between the degree of consolidation based on pore water pressure(Up) and that in terms of deformation(Us) are conducted. Then，the influences of the ratio of compression index to permeability index，c(Cc/Ck)and the vacuum load on consolidation behavior are investigated. Lastly，the prediction ability of the presented solutions is verified by comparing them with the test results. The results show that，the numerical solution is almost identical with the simplified solution for c = 1，but there is a difference between that two solutions for c＜1 or c＞1. Under different c，Us is always lager than Up at same time，and the consolidation slows down as the increasing of c. As for the consolidation process defined by the dissipation of excess pore water pressure，when c＜1，the consolidation speeds up with the increase in vacuum load; however，when c = 1，the variation in the vacuum load has no effect on the rate of consolidation，and when c＞1，the larger the vacuum load，the slower the consolidation.
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2020, Vol. 39 
