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 J4  2012, Vol. 46 Issue (3): 441-447    DOI: 10.3785/j.issn.1008-973X.2012.03.009
Study on properties of one-dimensional complex
nonlinear consolidation considering selfweight of saturated soils
HU An-feng1, HUANG Jie-qing1, XIE Xin-yu1, 2, WU Jian1, LI Jin-zhu1, LIU Kai-fu3
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China;
2. School of Civil Engineering and Architecture, Ningbo Institute of  Technology, Zhejiang University, Ningbo 315100, China;
3. School of Civil Engineering and Architecture, Zhejiang SciTech  University, Hangzhou 310018, China
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Abstract

The nonlinear equations of permeability coefficient and effective stress were derived as functions of void ratio from compression test data of Ningbo soft clay. Based on one-dimensional nonlinear large strain consolidation equation using void ratio as a control variable, the effect of self-weight of soil on consolidation was taken into account. The behavior of self-weight consolidation is strongly nonlinear. It is difficult to find analytical solutions to its controlling equation. Partial differential finite element software FLEXPDE was used to solve the consolidation equation. Distributions of effective stress and excess pore water pressure with depth were presented under conditions of different ratios between compression index and permeability index. The numerical results considering complex nonlinearity of soil were in better agreement with the laboratory test data than those obtained under the assumptions for constant consolidation coefficient and other parameters during consolidation. If the compression-permeability index ratio is not equal to 1.0, the results using these two methods differ significantly. In this case, the nonlinearity of permeability and compressibility should be considered in order to understand the real distributions of effective stress and excess pore water pressure with depth during consolidation.

Published: 01 March 2012
 CLC: TU 443
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