基于非Darcy渗流的饱和黏土一维非线性固结分析

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Abstract Considering the nonlinear deformation of soil，the Hansbo¢s formula for the non-Darcy flow is introduced to modify Terzaghi¢s one-dimensional consolidation equation；and the numerical solution analysis is performed by using the finite difference method. In order to verify its validity，the calculating solution by the present method for the case that the flow of pore water obeys Darcy¢s law is compared with the analytical solution based on the nonlinear consolidation theory proposed by Davis and Raymond. Then the effects of the non-Darcy flow parameters，the compression index of soil and the external vertical load on the consolidation process are investigated respectively. The calculating results indicate that both the pore water pressure dissipation rate and the foundation settlement rate are delayed with the increase in the ratio c of the compression index to the permeability index or the non-Darcy flow parameters m and i1，thereby they will be overestimated if the non-Darcy's characteristic of flow is not taken into account. In addition，the effect of the external vertical load on the consolidation process is related to the consolidation time and the ratio of the compression index to the permeability index.

Key words： soil mechanics saturated clay nonlinear consolidation non-Darcy flow finite difference method settlement pore water pressure

Received: 10 May 2010

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https://rockmech.whrsm.ac.cn/EN/Y2010/V29/I11/2348

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