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| 武汉黏土Duncan本构模型参数研究 | |
| 引用本文： | 周葆春,冯波,汪墨,王靖涛.武汉黏土Duncan本构模型参数研究[J].岩土力学,2008,29(7):1788-1792. |
| 作者姓名： | 周葆春 冯波 汪墨 王靖涛 |
| 作者单位： | 1. 信阳师范学院土木工程学院,信阳 464000;华中科技大学土木工程与力学学院,武汉 430074 2. 信阳师范学院土木工程学院,信阳,464000 3. 信阳市建筑勘察设计研究院有限公司,信阳,464000 |
| 基金项目： | 河南省自然科学基金 , 信阳师范学院青年骨干教师资助计划 |
| 摘 要： | 通过常规三轴压缩排水试验,确定了武汉正常固结黏土的DuncanEt-μt模型、Et-Bt模型及常值μt模型参数;通过三轴试样的有限元变形分析,验证了模型参数的合理性与有效性,为武汉地区Duncan本构模型的应用提供了参考.针对Duncan Et-μt模型基于局ε1-ε3曲线为双曲线关系假设,而实际试验曲线常常偏离理想的双曲线关系,造成μt参数拟合的困难,提出利用通过应力水平为70%与95%对应点的直线拟合ε3/ε1与ε3之间线性关系从而确定μt模型参数的改进方法,并将该模型参数用于三轴试样的体积变形预测,经与Duncan Et-Bt、Duncan Et和常值μt模型参数预测结果的对比,发现该方法与试验结果有更好的一致性,并具有简单方便的优点. |
| 关 键 词： | 武汉黏土 本构关系 Duncan模型 模型参数 武汉地区 黏土 本构模型 参数研究 clay Wuhan models parameters 一致性 预测结果 试验曲线 改进方法 发现 变形预测 体积 线性关系 直线拟合 对应点 应力水平 利用 |
| 收稿时间： | 2006-09-11 |
Research on parameters of Duncan models for Wuhan clay |
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| ZHOU Bao-chun,FENG Bo,WANG Mo,WANG Jing-tao.Research on parameters of Duncan models for Wuhan clay[J].Rock and Soil Mechanics,2008,29(7):1788-1792. | |
| Authors: | ZHOU Bao-chun FENG Bo WANG Mo WANG Jing-tao |
| Institution: | 1. College of Civil Engineering, Xinyang Normal University, Xinyang 464000, China; 2. College of Civil Engineering & Mechanics, Huazhong University of Science & Technology, Wuhan 430074, China; 3. Xinyang Research Institute of Reconnaissance and Architectural Design, Xinyang 464000, China |
| Abstract: | The parameters of Duncan Et-?t, Et-Bt and constant ?t models for the normal consolidated Wuhan clay are obtained by a series of drained conventional triaxial compression tests; the rationality and validity of parameters are confirmed by the finite element analysis; and it provides a reference for the application of Duncan models in Wuhan area. In view of a hyperbolic approximation has been suggested to describe the axial strain-radial strain relationship in Duncan Et-?t model, but the points of test results of real soils are frequently found to deviate from the ideal relationship, indicating that the axial strain-radial strain curves of real soils are not precisely hyperbolic in shape; and it results in some difficulties in parameter fitting. For best agreement of the theoretical and test results, a modified method is proposed that the straight line of ?3 /?1-?3 relationship be fitted to test data at the two points corresponding to stress difference equal to 70 % and 95 % of the peak strength. The validity and superiority of the modified method are attested by the contrastive analysis of prediction of the volumetric deformation of soil samples which adopt Et-Bt model, constant ?t model and the modified method. In addition, the method is simple in form and convenient to use. |
| Keywords: | Wuhan clay constitutive relation Duncan model model parameter |
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