| 粗粒土料湿化变形三轴试验研究 |
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| 引用本文： | 魏松,朱俊高.粗粒土料湿化变形三轴试验研究[J].岩土力学,2007,28(8):1609-1614. |
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| 作者姓名： | 魏松 朱俊高 |
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| 作者单位： | 1. 合肥工业大学,合肥,230009;河海大学,岩土工程研究所,南京,210098
2. 合肥工业大学,合肥,230009 |
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| 基金项目： | 国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合基金 |
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| 摘 要： | 在土石坝工程中,粗粒土料湿化变形是重要的但尚未很好解决的问题之一。利用改进的仪器,对某坝的粗粒土料进行了不同围压和湿化应力水平下保持应力水平不变的三轴湿化变形试验,研究了湿化变形量及湿化前后的应力-应变体变关系。试验结果表明,粗粒土料湿化变形随固结压力和湿化应力水平而变;随着湿化应力水平的增加湿化体变-轴变比逐渐减小;湿化后土体再加载时表现出先弹性后弹塑性的性状;与双线法相比,单线法得到的湿化变形更合理。同时根据试验结果,建议了计算湿化变形的改进的双线法,提出了最大湿化应力水平的概念,并利用该概念对试验结果进行了剖析,这些结论对湿化变形的进一步研究具有一定的参考价值。
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| 关 键 词： | 粗粒土料 湿化变形 最大湿化应力水平 三轴试验 |
| 文章编号： | 1000-7598-（2007）08-1609-06 |
| 收稿时间： | 2005-08-30 |
| 修稿时间： | 2005-08-30 |
Study on wettig behavior of coarse grained soil in triaxial test |
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| WEI Song,ZHU Jun-gao.Study on wettig behavior of coarse grained soil in triaxial test[J].Rock and Soil Mechanics,2007,28(8):1609-1614. |
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| Authors: | WEI Song ZHU Jun-gao |
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| Institution: | 1. University of Technology, Hefei 230009, China ; 2. Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | Wetting deformation of coarse grained soil is an important problem in earth dam design;but it is not solved well so far.The wetting deformation tests under various stress levels are carried out on a coarse grained soil;and the wetting deformations and curves of stress-axial strain-volume strain are obtained.The test results and analyses indicate that;the wetting deformation of the coarse grained soil is varied with cell pressure and wetting stress level;the ratio of wetting volume strain versus wetting axial strain is decreasing with the wetting stress level increasing;the wetted sample behaviour may be elacstic first elastoplastic after,while new load is forced on the sample;the method of single line for calculating wetting deformation is better than double lines.At the same time,a new method of improved double lines for calculating wetting deformation is proposed;the maximum wetting stress level is defined and used to explain the test results.The results may be significant to farther research on wetting deformation. |
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| Keywords: | coarse grained soil wetting deformation maximum wetting stress level triaxial test |
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