| 南宁膨胀土剪切蠕变特性及流变模型研究 |
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| 引用本文： | 金文婷,肖宏彬.南宁膨胀土剪切蠕变特性及流变模型研究[J].中南公路工程,2011(6):64-69,77. |
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| 作者姓名： | 金文婷 肖宏彬 |
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| 作者单位： | 湖南工业大学岩土工程研究所;中南林业科技大学; |
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| 基金项目： | 国家自然科学基金资助项目(50978097); 湖南省科技厅一般资助项目(2010SK3047); 湖南工业大学研究生创新项目(CX1019) |
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| 摘 要： | 利用改装的剪应力控制式直剪仪对南宁非饱和膨胀土进行了一系列直剪蠕变试验和加–卸载剪切回弹试验,得到了剪切蠕变曲线和剪切回弹曲线。试验结果表明,膨胀土在同一竖向应力条件下,剪应力和含水率越大其塑性和流变特性越明显;在同一含水率、同一剪应力条件下,竖向应力越小其塑性和流变特性越明显。根据对试验曲线的分析得到了膨胀土的剪切变形是由瞬时弹性变形、瞬时塑性变形,弹性滞后变形,粘塑性变形等组成。提出了膨胀土剪切蠕变的九元件模型,并通过拟合确定了相应的剪切蠕变方程和流变参数.研究结果为膨胀土流变问题的进一步研究提供可靠理论依据。
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| 关 键 词： | 膨胀土 剪切蠕变 土流变特性 蠕变模型 |
Experimental Study on Shear Creep Characteristic and Rheological Model of Nanning Expansive Soils |
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| JIN Wenting,XIAO Hongbin.Experimental Study on Shear Creep Characteristic and Rheological Model of Nanning Expansive Soils[J].Central South Highway Engineering,2011(6):64-69,77. |
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| Authors: | JIN Wenting XIAO Hongbin |
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| Institution: | JIN Wenting1,XIAO Hongbin1,2(1.Institute of Geotechnical Engineering,Hunan University of Technology,Zhuzhou,Hunan 412008,China,2.Cental South University of Forestry and Technology,Changsha,Hunan 410004,China) |
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| Abstract: | A series of direct shear creep tests were carried out on Nanning expansive soils by means of stress controlled direct shear apparatus.The shear creep curves and the loading-unloading creep curves were obtained.The test shows that the plasticity and rheological properties were more and more obviously when the moisture content or stress is increased under the vertical stress is a constant value.When the moisture content or shear stress is constant,the vertical stress smaller the plasticity and rheological pro... |
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| Keywords: | expansive soils shear creep rheological behaviour of soils creep model |
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