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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。
The nonlinear constitutive model of soils, which is obtained under the GDS consolidation test, is widely accepted, including the piecewise linear e-lgp model, the linear e-lgk model and the Hansbo non Darcy seepage model. Combined with GDS consolidation and infiltration test of soft soil samples in Ningbo, the parameters acquisition process and parameter values of the above model are given. Based on the classical Biot consolidation theory, the finite element equation considering the above nonlinear constitutive model is deduced and the corresponding calculation program is compiled. Through the example analysis, the reliability of the theory and procedure is verified, and the influence of pervious boundary, non-Darcy flow, smearing effect and load size on the nonlinear consolidation of shaft foundations is obtained. Permeable boundary has significant influence on shaft consolidation, but non-Darcy flow and smear effect are not significant. Load size has a complex influence on nonlinear consolidation behavior of shaft foundation, which can accelerate or slow shaft consolidation rate.