| 红黏土承载比的土团尺寸效应研究 |
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| 引用本文： | 谈云志,郑爱,吴翩,付伟.红黏土承载比的土团尺寸效应研究[J].岩土力学,2013,34(5):1242-1246. |
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| 作者姓名： | 谈云志 郑爱 吴翩 付伟 |
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| 作者单位： | 1. 三峡大学 三峡库区地质灾害教育部重点实验室，湖北 宜昌443002；2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071；3. 中交第二公路勘察设计研究院有限公司，武汉 430056 |
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| 基金项目： | 国家自然科学基金项目(No. 51009084)；岩土力学与工程国家重点实验室开放基金项目(No. Z011002)；湖南省科技进步与创新计划项目 (No. 200910，No. 201045)。 |
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| 摘 要： | 高液限红黏土用于路基填筑时，因其不良的水理特性，需要掺石灰或水泥改良。但红黏土成团现象十分突出，进行灰土拌和时不易达到均匀状态，影响预期改良效果。通过对不同直径的红黏土土团及石灰改良土土团进行承载比试验，结果表明：干密度随着土团直径尺寸的增大呈现先增大后减小的特征，红黏土和石灰土的最大干密度对应的土团直径处在0.2～ 5 mm范围内；而最大承载比CBR值对应的土团直径分别处在5～10 mm和2～5 mm的范围内。石灰土和红黏土的吸水率、膨胀率均随着土团尺寸的增大，呈现先减小后增大的整体变化趋势。在2～10 mm的范围内，两种土的膨胀量最小。石灰改良只对直径小于5 mm的土团的膨胀特性起到明显的抑制作用。可见，现场施工中严格控制土团的大小对保证土体的强度和水稳定性具有十分重要的意义。
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| 关 键 词： | 土团 尺寸效应 红黏土 加州承载比 |
| 收稿时间： | 2012-03-16 |
Effect of aggregate soil size on California bearing ratio values of laterite soil |
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| TAN Yun-zhi,ZHENG Ai,WU Pian,FU Wei.Effect of aggregate soil size on California bearing ratio values of laterite soil[J].Rock and Soil Mechanics,2013,34(5):1242-1246. |
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| Authors: | TAN Yun-zhi ZHENG Ai WU Pian FU Wei |
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| Institution: | 1. Key Laboratory of Geological Hazards in Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. Second Highway Survey, Design and Research Institute of China Communications, Wuhan 430056, China |
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| Abstract: | The high liquid limit laterite soil frequently needs to be improved by adding lime or cement due to its moisture susceptible property, while it is used to construct subgrade. However, it’s difficult to uniformly mix ash and soil for the aggregate phenomenon of laterite soil; that would influence on the expected stabilization effects finally. California bearing ratio (CBR) tests are conducted on different sizes aggregation soil specimens of laterite soil and lime stabilized soil. The results show that, the dry density of soil mass increases first and then decreases with the increase of aggregate soil diameter, and the diameter corresponding to the maximum dry density is in 0.2-5 mm range for both laterite soil and lime stabilized soil; and the diameters of laterite soil and lime soil corresponding to the largest CBR values are in 5-10 mm and 2-5 mm range, respectively. The absorption and inflation rate decrease first and then increase with the increasing of aggregate soil size of them. The swelling percent of them are at minimum stage in the diameter range of 2-10 mm. Lime could reduce the expansive of the laterite soil significantly; when the aggregate soil diameter is less than 5 mm. It’s very important to control the size of soil mass strictly in the site construction, so as to ensure the soil strength and moisture don’t fluctuate. |
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| Keywords: | aggregate soil size effect laterite soil California bearing ratio |
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