湿干循环下压实膨胀土裂隙扩展规律研究

黎伟; 刘观仕; 汪为巍; 姚婷; 盛建豪

doi:10.11779/CJGE201407014

湿干循环下压实膨胀土裂隙扩展规律研究 English Version

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,湖北武汉 430071

基金项目: 国家自然科学基金项目（51279200,51079141）

详细信息

作者简介:
黎伟(1989- ),男,湖北咸宁人,硕士研究生,主要从事特殊土力学方面的研究。E-mail: liwei890508@126.com。

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出版历程
- 收稿日期: 2013-11-11
- 发布日期: 2014-07-24

Crack propagation law of compacted expansive soils under wetting-drying cycles

State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

摘要

摘要: 裂隙特征作为膨胀土裂隙性研究的基础,其定量化描述有助于膨胀土工程性质的深入探究。以膨胀土平面裂隙为研究对象,使用数码摄影获取多次湿干循环下的裂隙扩展图像,采用优化和改进的裂隙图像处理及裂隙特征提取方法,分析所获得的膨胀土裂隙各特征参数。结果表明：室内压实膨胀土表面裂隙率随着湿干循环次数增加而增大,且第二次湿干循环对裂隙率影响最为显著;裂隙发育峰值条数在第一次湿干循环后最多,总长度最大,而三次湿干循环后的裂隙条数和总长度较为相近;裂隙宽度随湿干循环次数增加而增大,且第二次湿干循环影响最为显著;同时,第一次湿干循环中主裂隙发育最明显,在第二次和第三次中宽度发育趋于均匀;通过裂隙方向玫瑰花图发现,裂隙主要沿着初始方向扩展,直至下一次湿干循环;裂隙发育方向在第一次湿干循环中是随机的,而在第二次与第三次中有较高相似性,表明湿干循环对裂隙发育方向的影响也主要发生在第二次。
- 湿干循环 /
- 压实膨胀土 /
- 裂隙特征 /
- 扩展规律
Abstract: The quantitative description of crack features, which is the basis of researches on crack of expansive soils, contributes to further investigation on engineering properties of expansive soils. Taking surface cracks of expansive soils as research objects, the crack images under different wetting-drying cycles are captured by digital imaging. The crack features are analyzed by using the optimized and improved methods for crack image processing and crack feature extraction. The results show that the total surface crack ratio of laboratory compacted expansive soils increases with the number of the wetting-drying cycles, and that the effect of wetting-drying cycles is mainly reflected in the second cycle. The number of cracks is the greatest and the total length of cracks is the largest at the preliminary stage of the first wetting-drying cycle, however, the final number and the total length of cracks are closer after the third wetting-drying cycle. The crack width increases with the increase of the wetting-drying cycles, and is mainly reflected in the second cycle. Meanwhile, the development of the main crack is the most obvious in the first wetting-drying cycle, and the width of cracks tends to be uniform in the second and third cycles. Based on rose diagrams of crack orientation, it is found that the cracks develop along the initial orientation until the next wetting-drying cycle. The crack orientation in the first wetting-drying cycle is random, but the orientation has high similarity in the second and third cycles, indicating that the effect of wetting-drying cycles on the crack orientation is also mainly reflected in the second cycle.
- wetting-drying cycle /
- compacted expansive soil /
- crack feature /
- propagation law

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参考文献(17)

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