| 高岭土一维增湿的湿陷-流变分析方法研究 |
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| 引用本文： | 邓检良,许强,龙冈文夫.高岭土一维增湿的湿陷-流变分析方法研究[J].岩土力学,2013,34(10):2857-2862. |
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| 作者姓名： | 邓检良 许强 龙冈文夫 |
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| 作者单位： | 1.上海交通大学 船舶海洋与建筑工程学院，上海 200240；2.成都理工大学 地质灾害防治与地质环境保护国家重点实验室，成都 610059； 3.日本东京理科大学，野田市 2788510 |
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| 基金项目： | 国家重点实验室开放基金(No. SKLGP2013K022)。 |
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| 摘 要： | 塑性单元体与黏性单元体并联之后再与弹性单元体串联即构成三要素模型，其各单元体都具有非线性本构关系。通过考虑增湿过程中饱和度对三要素模型中的黏性单元体和塑性单元体的影响，建立了弹-塑-黏性与湿陷性耦合的湿陷流变本构模型。湿陷对塑性单元体的影响表现为应变不变条件下屈服应力的降低；而对黏性单元体的影响表现为速率敏感系数的升高。两种影响可以通过试验确定。以此模型为基础，分析了高岭土的单轴压缩固结试验中的湿陷-流变变形，提出了一种湿陷-流变分析方法。试验中，在干燥条件下观测了蠕变；在增湿过程中观测了湿陷。试验中对含水量的测量精度高。理论所得含水率-应变-时间关系与实测结果接近，并区分了增湿过程中的湿陷和干燥条件下的蠕变，证明了本方法的有效性。
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| 关 键 词： | 增湿 高岭土 一维固结 三要素模型 |
| 收稿时间： | 2013-04-16 |
A study of collapsible and rheological properties of kaolin clay during wetting in 1D consolidation test |
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| DENG Jian-liang
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XU Qiang
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TATSUOKA Fumio.A study of collapsible and rheological properties of kaolin clay during wetting in 1D consolidation test[J].Rock and Soil Mechanics,2013,34(10):2857-2862. |
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| Authors: | DENG Jian-liang XU Qiang TATSUOKA Fumio |
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| Institution: | 1. School of Naval Architecture, Ocean, and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. State Key Laboratory of Geohazard Prevention & Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 3. Civil Engineering Department, Tokyo University of Science, Noda, 2778510 Ostalcode, Japan |
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| Abstract: | Connecting the plastic component and the viscous component in parallel, then connecting these two components and the elastic component in series, yields the three component model, where each component has a unique nonlinear constitutive relation. Based on the three-component model, a elasto-plasto-viscosity model is proposed by considering the effects of wetting on the viscous component and the plastic component. The effects of wetting on the plastic component are described by a decrease in the inviscid yield stress at a fixed irreversible strain, while the effects on the viscous component are described by the increase of the rate-sensitivity coefficient. Both the effects on the two components can be fully determined based on test results. Subsequently, based on this collapse-rheology model, a numerical analysis is performed on the collapse-rheology behavior of Kaolin clay in a 1D consolidation test. In the test, the creep is observed in a dried condition, while the collapse is observed during the stepwise wetting. The water content and strain in the test are precisely measured. The validity of the analysis method is shown by the well simulated water content-strain-time relation and the definite difference between the collapse during wetting and the creep under dried condition. |
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| Keywords: | humidification kaolin clay 1D consolidation the three-component model |
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