| 低含水率非饱和砂土抗剪强度研究 |
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| 引用本文： | 慕青松,马崇武,苗天德.低含水率非饱和砂土抗剪强度研究[J].岩土工程学报,2004,26(5):674-678. |
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| 作者姓名： | 慕青松 马崇武 苗天德 |
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| 作者单位： | 兰州大学物理科学与技术学院力学系；兰州大学物理科学与技术学院力学系 甘肃兰州730000；甘肃兰州730000； |
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| 基金项目： | 兰州大学留校博士科研启动基金资助项目 (50 2 -571 50 2，50 2 - 870 889) |
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| 摘 要： | 在引进附加内压力概念的基础上 ,将非饱和砂土中的基质吸力划分为毛细吸力和附加内压力两部分 ,进一步将低含水率非饱和砂土中的有效应力区分为由基质吸力引起的有效应力及由重力和其它外力产生的有效应力两部分 ,基此推导出了基质吸力与抗剪强度之间的关系 ,第一次成功地解释了关于非饱和砂土抗剪强度的Donald实验现象 :非饱和砂土的抗剪强度随含水率降低、基质吸力增大而升高 ,但升高的速度逐渐减缓 ,并当基质吸力超过某一阀值时 ,抗剪强度开始随基质吸力的增大而下降
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| 关 键 词： | 非饱和砂土 毛细吸力 附加内压力 有效应力 抗剪强度 |
| 文章编号： | 1000-4548(2004)05-0674-05 |
Research on shear strength of unsaturated sand with low-moisture content |
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| MU Qingsong,MA Chongwu,MIAO Tiande.Research on shear strength of unsaturated sand with low-moisture content[J].Chinese Journal of Geotechnical Engineering,2004,26(5):674-678. |
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| Authors: | MU Qingsong MA Chongwu MIAO Tiande |
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| Affiliation: | Department of Mechanics School of Physical Science and Technology Lanzhou University Lanzhou 730000 China |
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| Abstract: | Based on the concept of additional internal pressure, We revealed that the general suction in unsaturated sand with low moisture content consists of the capillary suction and the additional internal pressure,and the effective stress is decomposed into two parts:one caused by the general suction, and the other caused by the gravity and other external loads. According to these concepts,we obtained a relation between the general suction and the shear strength for the unsaturated sand with low moisture content, and consequently a satisfactory explanation to the important experimental phenomenon of the unsaturated sand:the shear strength increases nonlinearly with the increase of the general suction, but the converse situation would happen when the general suction exceeds a special value. |
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| Keywords: | unsaturated sand capillary suction additional internal pressure effective stress shear strength |
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