A viscoplastic SANICLAY model for natural soft soils
A viscoplastic SANICLAY model for natural soft soils
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DOI：
10.1016/j.compgeo.2015.11.023
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发表时间：
2016-03
影响因子：
5.3
通讯作者：
M. Rezania;M. Taiebat;E. Poletti
中科院分区：
文献类型：
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作者：
M. Rezania;M. Taiebat;E. Poletti
本文重点研究了天然粘土中应变速率相关性的本构模型和数值模拟，同时也考虑了各向异性和破坏作用。为此，SANICLAY模型被认为是参考模型，该模型考虑了组构各向异性，并考虑了天然粘土的敏感性的附加破坏特征。为简化起见，采用了关联流动规则。利用Perzyna的超应力理论对模型公式进行了改进，以解释应变率依赖的重要特征。然后将该模型隐式积分到有限元程序PLAXIS中。通过将几个单元测试和一个边值问题的模拟结果与已有的实验数据进行比较，探讨了所开发和实现的模型的性能。单元试验包括不同粘土在一维和三轴条件下的恒应变率试验。边值问题包括一个测试路堤，即在魁北克圣阿尔班建造的路堤D。为便于比较，试验路堤还采用了修正的Cam-Clay(MCC)模型、SANICLAY模型和未破坏的粘塑性模型进行分析。结果表明，开发和实施的粘塑性SANICLAY成功地再现了天然软土的应变率相关特性。
This paper focuses on constitutive and numerical modeling of strain-rate dependency in natural clays while also accounting for anisotropy and destructuration. For this purpose the SANICLAY model that accounts for the fabric anisotropy with the additional destructuration feature that accounts for sensitivity of natural clays, is considered as the reference model. An associated flow rule is adopted for simplicity. The model formulation is refined to also account for the important feature of strain-rate dependency using the Perzyna’s overstress theory. The model is then implicitly integrated in finite element program PLAXIS. Performance of the developed and implemented model is explored by comparing the simulation results of several element tests and a boundary value problem to the available experimental data. The element tests include the constant strain-rate under one-dimensional and triaxial conditions on different clays. The boundary value problem includes a test embankment, namely embankment D constructed at Saint Alban, Quebec. For comparison, the test embankment is also analyzed using the Modified Cam-Clay (MCC) model, the SANICLAY model, and the viscoplastic model but without destructuration. Results demonstrate the success of the developed and implemented viscoplastic SANICLAY in reproducing the strain-rate dependent behavior of natural soft soils.