黏土广义塑性模型在FLAC^(3D)中的数值实现与应用  

Numerical Implementation and Application of the Generalized Plasticity Model for Clays in FLAC^(3D)

作　　者：林志远 熊传祥[1,2,3] 谢永宁 黄盛锋 LIN Zhiyuan;XIONG Chuanxiang;XIE Yongning;HUANG Shengfeng(College of Environment and Resources,Fuzhou,Fujian 350116,China;Key Laboratory of Geohazard Prevention of Hilly Mountains,Ministry of Natural Resources,Fuzhoo,Fujian 350116,China;Fujian Key Laboratory of Geohazard Preventioo,Fuzhou,Fujian 350116,China)

机构地区：[1]福州大学环境与资源学院,福建福州350116 [2]自然丘陵山地地质灾害防治重点实验室,福建福州350116 [3]福建省地质灾害重点实验室,福建福州350116

出　　处：《水利与建筑工程学报》2021年第3期159-165,共7页Journal of Water Resources and Architectural Engineering

基　　金：自然资源部丘陵山地地质灾害防治重点实验室(福建省地质灾害重点实验室)开放基金资助(FJKLGH2020K002)。

摘　　要：广义塑性模型(Pastor-Zienkiewicz Model)对遭受不同应力历史的砂土与黏土具有广泛适用性。然而有关黏土广义塑性模型的二次开发研究却鲜有进展,限制了该模型在求解初始边界值问题上的应用。利用FLAC^(3D)(7.0版本)软件提供的二次开发平台(UDM)成功实现了黏土广义塑性模型的二次开发,并给出了二次开发的主要流程。二次开发的验证工作分别围绕3组土样的常规三轴试验展开,通过与试验结果的对比,其正确性得到证实。单元试验对超固结黏土应力应变行为的模拟,一定程度上补充了黏土广义塑性模型在超固结土方面研究的不足,对广义塑性模型的研究具有促进作用。通过路堤填筑数值模拟,表明该模型具有工程适用性,为解决岩土工程问题提供了新的选择。The generalized plasticity model for clays was proposed thirty years ago and can reasonably simulate the mechanical behaviors of soils with different over-consolidation ratios.However,it has been rarely implemented in large numerical software,which limits its applications for solving initial-boundary-value problems in geotechnical engineering.In this paper,the generalized plasticity model for clays is implemented in FLAC^(3D)(Version 7.0)User Defined Constitutive Model(UDM)framework.The detailed differential formulation adopted for implementation in FLAC^(3D) is then derived,followed by the main process and associated techniques for developing the UDM plugin.The numerical implementation is verified by comparing the results of laboratory tests and those by one zone tests of conventional triaxial compression on three soil samples with different over-consolidation ratios.Particularly,the stress-strain behaviors of over-consolidated soils can be captured well by the numerical simulations.Finally,the engineering applicability of the model implemented is demonstrated by modeling a simplified embankment loading problem,in which the displacements and pore water pressure during loading and consolidation process can all be well modelled.The numerical implementation of the generalized plasticity model for clays broadens the applicability of the model and provides an alternative tool for modeling of geotechnical engineering problems.

关 键 词：黏土 广义塑性模型 二次开发 有限差分法 

分 类 号：TU442[建筑科学—岩土工程]