| 不同固结条件下黏土数值化建模的研究 |
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| 引用本文： | 程涛,晏克勤,王靖涛.不同固结条件下黏土数值化建模的研究[J].岩土力学,2009,30(11):3352-3356. |
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| 作者姓名： | 程涛 晏克勤 王靖涛 |
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| 作者单位： | 1. 黄石理工学院 土木建筑工程学院，湖北 黄石 435003；2. 华中科技大学 土木工程与力学学院，武汉 430074 |
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| 基金项目： | 湖北省教育厅优秀青年人才基金项目，黄石理工学院科研基金重点项目 |
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| 摘 要： | 研究了不同初始固结压力条件对黏土本构关系的影响。进行了2组不同固结条件下的排水压缩试验，即等压固结条件和K0固结条件。采用数值建模方法，以 和 为硬化参数的双屈服面模型为框架，通过对试验数据空间的反演获得两种不同初始条件下的黏土弹塑性本构关系，并在整个应力场 可视化。将该数值模型嵌入有限元程序对三轴压缩试验进行数值模拟，并与试验曲线及相同路径下的剑桥模型和Duncan-Chang模型关系曲线进行对比。结果表明，数值建模方法有较好的容错性，能很好地反映应力历史的影响，能模拟真实应力路径。
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| 关 键 词： | 数值建模方法 应力路径 应力历史 本构关系 黏土 |
| 收稿时间： | 2008-01-30 |
Study of numerical model for triaxial compression test on clay under different consolidation conditions |
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| CHENG Tao,YAN Ke-qin,WANG Jing-tao.Study of numerical model for triaxial compression test on clay under different consolidation conditions[J].Rock and Soil Mechanics,2009,30(11):3352-3356. |
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| Authors: | CHENG Tao YAN Ke-qin WANG Jing-tao |
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| Institution: | 1. Department of Civil Engineering, Huangshi Institute of Technology, Huangshi 435003, China; 2. College of Civil Engineering.& Mechanics, Huangzhong Univ. of Science & Technology, Wuhan 430074, China |
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| Abstract: | The effects of different initial stress states on the constitutive relations of clay are studied. With clay selected as test sample, two series of triaxial consolidation draining compression tests are performed under different consolidation conditions, isotropic consolidation and K0 consolidation. Based on the tests under the two different initial consolidation conditions, the elastoplastic constitutive models which contain two yield surfaces of two relatively independent hardening parameters and are derived by using numerical modeling method. The three-dimensional surfaces of the stress-strain relations in the whole stress field are drawn through visualization. Moreover, the comparisons of the stress-strain relation curves with the simulated results obtained by the numerical model, Cam-clay model, Duncan-Chang hyperbolic model and from test data are made. It is shown that the numerical modeling method is reasonable, which can reflect the effects of stress paths and stress history. |
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| Keywords: | numerical modeling method stress path stress history constitutive relation clay |
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