| 改进Koppejan蠕变模型及其应用 |
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| 引用本文： | 魏丽敏,冯胜洋,何群,杨奇.改进Koppejan蠕变模型及其应用[J].岩土力学,2014,35(6):1762-1767. |
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| 作者姓名： | 魏丽敏 冯胜洋 何群 杨奇 |
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| 作者单位： | 中南大学 土木工程学院，长沙 410075 |
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| 基金项目： | 铁道部科技研究开发计划重点项目（No.2010G018-E-3)；上海铁路局科研计划项目（No.2011079）；2013年湖南省研究生科研创新项目；国家自然科学基金项目(No.51208518）。 |
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| 摘 要： | 将基于固结试验建立的Koppejan蠕变模型应力-应变-时间关系改进为增量形式，并泛化到三维应力空间，建立了改进的Koppejan蠕变模型。基于ABAQUS软件对改进模型进行二次开发，采用上海软黏土的长期固结试验结果对模型进行验证，结果表明，Koppejan模型能较好地描述上海软黏土的蠕变特性，且改进Koppejan模型的计算精度比经典Koppejan模型高，两种模型应用于淤泥质粉质黏土的计算效果均比粉质黏土好。将改进Koppejan蠕变本构模型应用于某高速铁路桥梁桩基长期变形的三维有限元分析，与现场实测沉降的对比表明，改进Koppejan模型能较好地应用于实际工程的长期变形计算，且计算效果较好。
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| 关 键 词： | Koppejan蠕变模型 模型改进 ABAQUS 二次开发 桩基沉降 |
| 收稿时间： | 2013-06-25 |
Improved Koppejan creep model and its application |
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| WEI Li-min,FENG Sheng-yang,HE Qun,YANG Qi.Improved Koppejan creep model and its application[J].Rock and Soil Mechanics,2014,35(6):1762-1767. |
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| Authors: | WEI Li-min FENG Sheng-yang HE Qun YANG Qi |
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| Institution: | School of Civil Engineering, Central South University, Changsha 410075, China |
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| Abstract: | The stress-strain-time relationship of the Koppejan creep model based on consolidation tests is improved to the incremental form, which is generalized to 3D stress space, and then the improved Koppejan creep model for soft soil is established in this work by the incremental form. Based on the ABAQUS software, an UMAT is developed by the improved Koppejan model. Using long-term consolidation tests of Shanghai soft clay to validate the model, the results show that the Koppejan model describes the creep property of Shanghai soft clay very well; the computational accuracy of the improved Koppejan model is better than that of the classical Koppejan model, and the two models work better for mucky clay than silty clay. Using the improved Koppejan creep constitutive model to the three-dimensional FEM of a high-speed railway bridge pile foundation long-term deformation, and comparing with the measured settlement, the results indicate that the improved Koppejan can be well used for computing long-term deformation of actual projects. |
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| Keywords: | Koppejan creep model model improvement ABAQUS secondary development pile foundation settlement |
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