Nonlinear consolidation of vertical drains with coupled radial-vertical flow considering time and depth dependent vacuum pressure |
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| Authors: | Si-jie Liu Xue-yu Geng Hong-lei Sun Yuan-qiang Cai Xiao-dong Pan Li Shi |
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| Institution: | 1. Research Center of Coastal and Urban Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China;2. School of Engineering, University of Warwick, Coventry, U.K.;3. Institute of Disaster Prevention and Reduction Engineering and Protective Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China;4. Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, China |
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| Abstract: | 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. |
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| Keywords: | consolidation multistage loading vacuum pressure loss vacuum pressure propagating stage vertical drain |
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