基于GDS固结渗透试验参数的竖井地基固结非线性有限元分析

doi:10.13722/j.cnki.jrme.2014.s2.100

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摘要介绍在GDS固结渗透联合测试试验条件下获得的且被广泛认可的土体非线性本构模型，包括分段线性e-lgp模型、线性e-lgk模型和Hansbo非达西渗流模型。结合宁波软土试样的GDS固结渗透联合测试试验，给出上述模型的参数获取过程及参数取值。在经典Biot固结理论基础上，推导考虑上述非线性本构模型的有限元方程，编制相应的计算程序。通过算例分析，验证理论和程序的可靠性，并获得透水边界、非达西流、涂抹效应和荷载大小对竖井地基非线性固结的影响。透水边界对竖井地基固结影响显著，非达西渗流和涂抹效应的影响均不显著，荷载大小对竖井地基非线性固结性状影响复杂，可加快亦可减缓竖井地基固结速率。

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	邓岳保1
	谢康和2
	李菲菲2
	刘干斌1

关键词 ：土力学, 竖井地基, 有限元分析, 固结渗透试验, 非达西渗流

Abstract：A series of widely accepted non-linear constitutive models，which can be fully gained from the conjoined consolidation permeability test by GDS advanced consolidation testing system，are firstly introduced. These models contain the piecewise linear e-lgp model，the linear e-lgk model and Hansbos non-Darcy flow model，where e is the porosity，p is the loading pressure and k is the permeability. Then，the parameters acquisition process for these models is recommended with the presentation of conjoined consolidation permeability test for Ningbo soft soil by GDS. Next，the finite element equations considered these nonlinear models are deduced based on the classical Biots consolidation theory. The corresponding computing program is presented in detail. The reliability of the program and its theoretical basis is verified through the comparison with an existing numerical method. Lastly，example analysis for vertical drained ground with layered soft soil is carried out and the influences of the permeable boundary，non-Darcy flow，smear effect and loading size on consolidation are studied. It is found that the influence of the permeable boundary is obvious，while the influences of non-Darcy flow and smear effect are not obvious. The influence of loading size is more complicated，which will accelerate or slow down the consolidation rate.

Key words： soil mechanics vertical drained ground finite element analysis consolidation permeability test non-Darcian flow

引用本文:

邓岳保1，谢康和2，李菲菲2，刘干斌1. 基于GDS固结渗透试验参数的竖井地基固结非线性有限元分析[J]. 岩石力学与工程学报, 2014, 33(S2): 4203-4210.
DENG Yuebao1，XIE Kanghe2，LI Feifei2，LIU Ganbin1. NONLINEAR FINITE ELEMENT ANALYSIS OF CONSOLIDATION FOR VERTICAL DRAINED GROUND WITH PARAMETERS DETERMINED FROM GDS CONSOLIDATION PERMEABILITY TESTS. , 2014, 33(S2): 4203-4210.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.s2.100 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/IS2/4203

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