| 引入非线性瞬时弹性模量的软土流变模型 |
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| 引用本文： | 谷任国,邹育,房营光,胡玉光.引入非线性瞬时弹性模量的软土流变模型[J].岩土力学,2018,39(1):237-241. |
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| 作者姓名： | 谷任国 邹育 房营光 胡玉光 |
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| 作者单位： | 1. 华南理工大学 土木与交通学院，广东 广州 510641；2. 华南理工大学 亚热带建筑科学国家重点实验室，广东 广州 510641 |
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| 基金项目： | 亚热带建筑科学国家重点实验室自主研究课题(No. 2017KB16)；国家自然科学基金青年基金项目(No. 51208211)。 |
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| 摘 要： | 软土是一种非线性流变物质，但现行流变模型却忽略了加载瞬时的非线性变形；软土流变试验参数是数学模型参数而非物理模型参数，一个土样一般只对应一种材料参数，但现行流变模型的模型参数常随着荷载变化，且变化无规律，离散性大。基于以有机质为流变相物质的人工土试样室内一维压缩蠕变试验，建立了各级荷载作用下具有相同模型参数的7组件流变模型，用非线性弹簧H描述软土加载瞬时弹塑性变形、并联的三元件组件模拟软土随时间变化的黏弹塑变形。结果表明：引入三次非线性瞬时弹性模量的7组件流变模型能够较准确地反映软土的流变特性。
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| 关 键 词： | 瞬时变形 瞬时弹性模量 流变模型 模型参数 |
| 收稿时间： | 2016-01-28 |
Rheological model of soft soils using nonlinear instantaneous elastic modulus |
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| GU Ren-guo,ZOU Yu,FANG Ying-guang,HU Yu-guang.Rheological model of soft soils using nonlinear instantaneous elastic modulus[J].Rock and Soil Mechanics,2018,39(1):237-241. |
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| Authors: | GU Ren-guo ZOU Yu FANG Ying-guang HU Yu-guang |
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| Institution: | 1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong 510641, China; 2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, Guangdong 510641, China |
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| Abstract: | Soft soil is one type of material with nonlinear rheological behavior. The existing rheological models ignore nonlinear deformation under transient loading conditions. Rheological testing parameters for soft soil are mathematical parameters rather than physical model parameters. One soil generally corresponds to only one type of material parameters. But model parameters of the existing rheological model often change irregularly under varying loading conditions. Soft soils containing organic materials as the rheological phase are tested under one-dimensional consolidation-creep condition. A rheological model containing seven components is developed with same material parameters under different loading conditions. Non-linear spring is applied to describe elastic-plastic deformation subjected to transient loading. Parallel three-element components are applied to describe viscosity, plasticity and elastic deformation with time. The results show that the rheological behavior of soft soil can be accurately reflected by seven-components rheological model with incorporating cubic nonlinear transient elastic modulus. |
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| Keywords: | instantaneous deformation instantaneous elastic modulus rheological model model parameter |
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