| 软黏土的三轴蠕变试验与修正的Singh-Mitchell蠕变模型 |
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| 引用本文： | 刘业科,邓志斌,曹平,黄永恒,林杭.软黏土的三轴蠕变试验与修正的Singh-Mitchell蠕变模型[J].中南大学学报(自然科学版),2012,43(4):1440-1446. |
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| 作者姓名： | 刘业科 邓志斌 曹平 黄永恒 林杭 |
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| 作者单位： | 1. 中南大学资源与安全工程学院,湖南长沙,410083
2. 湖南省公路管理局,湖南长沙,410011 |
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| 基金项目： | 国家自然科学基金资助项目(10972238);国家安全生产监督管理总局安全生产科技发展计划项目(08-203,HN08-19);中南大学研究生学位论文创新选题基金资助项目(134377237) |
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| 摘 要： | 为了准确地掌握软黏土的蠕变特性,以湖南省竹城公路路基软黏土为研究对象,采用梯级荷载加载方法进行了室内三轴固结不排水蠕变试验,获得该软黏土蠕变试验数据和曲线.然后采用Singh-Mitchell经验蠕变模型描述该软黏土的蠕变特性,但模型计算结果与试验结果误差较大.分析Singh-Mitchell模型与试验结果产生误差的原因,通过对Singh-Mitchell模型的指数函数部分进行改进以及将原幂函数部分改换成双曲线函数,建立修正的Singh-Mitchell蠕变模型,并将新建立模型的计算结果与试验结果进行比较.研究结果表明:所建立的修正的Singh-Mitchell蠕变模型与试验结果一致性远优于原Singh-Mitchll模型,能更好地描述该软黏土的蠕变特性.
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| 关 键 词： | 软黏土 蠕变试验 蠕变特性 偏应力 Singh-Mitchell蠕变模型 修正 |
Triaxial creep test and modified Singh-Mitchell creep model of soft clay |
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| LIU Ye-ke
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DENG Zhi-bin
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CAO Ping
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HUANG Yong-heng
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LIN Hang.Triaxial creep test and modified Singh-Mitchell creep model of soft clay[J].Journal of Central South University:Science and Technology,2012,43(4):1440-1446. |
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| Authors: | LIU Ye-ke DENG Zhi-bin CAO Ping HUANG Yong-heng LIN Hang |
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| Institution: | 1 (1.School of Resources & Safety Engineering,Central South University,Changsha 410083,China; 2.Hunan Province Highway Administration Bureau,Changsha 410011,China) |
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| Abstract: | Consolidated undrained triaxial creep tests of Hunan Zhucheng highway subgrade soft clay were done with multi-grade loading method for knowing the characteristic well.A good result of creep test was obtained.Singh-Mitchell creep model was used for describing creep characteristic of soft clay.But the results calculated by Singh-Mitchell creep model had large errors with that from laboratory tests.Modified Singh-Mitchell creep model was found by mending exponential function of Singh-Mitchell creep model and changing its power function into hyperbolic function after analyzing the errors.Compared with the original model results,the modified model results have better accordance with that from the laboratory tests,and are more suitable to reflect the creep characteristics of that soft clay. |
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| Keywords: | soft clay creep test creep characteristics deviatoric stress Singh-Mitchell creep model modification |
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