Crack Propagation Law of Compacted Expansive Soil with Various Original Compactness and Water Content

LIU Guan-shi; CHEN Yong-gui; ZHANG Gui-bao; ZENG Xian-yun

doi:10.11988/ckyyb.20180284

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Journal of Changjiang River Scientific Research Institute ›› 2019, Vol. 36 ›› Issue (11) : 91-97. DOI: 10.11988/ckyyb.20180284

ROCK-SOIL ENGINEERING

Crack Propagation Law of Compacted Expansive Soil with Various Original Compactness and Water Content

LIU Guan-shi¹, CHEN Yong-gui², ZHANG Gui-bao³, ZENG Xian-yun³

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Abstract

Crack is a crucial factor that affects the mechanical properties of expansive soil. Expansive soils taken from Nanyang Expressway (Henan Province, China) were compacted to big-size samples with various original water content and compactness, and then the samples were desiccated gradually in a closed greenhouse where a camera was used to record the propagation of cracks on the surfaces of samples. The captured images were analyzed quantitatively using self-compiled program of MatLab to obtain the characteristics of surface cracks which were further used to explore the laws of crack propagation. The results suggest that the course of crack propagation in compacted expansive soil samples can be divided into three stages: in the first stage minor cracks aroused and developed quickly; then main cracks emerged and cracks reached peak in the second stage; at last the cracks withdrew and remained stable in the third stage. The higher the original water content was, the faster the cracks on the surfaces of expansive soil samples developed, the higher the extent of crack development was, and the longer the crack development lasted; the higher the original compactness, the smaller the surface crack ratio and total length of expansive soil samples were, but the larger the crack width was. The above results can be explained by the mechanism of superficial evaporation and water transformation in the soil.

Key words

expansive soil / crack propagation / digital image / binary image / crack ratio / compactness / initial water content

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LIU Guan-shi, CHEN Yong-gui, ZHANG Gui-bao, ZENG Xian-yun. Crack Propagation Law of Compacted Expansive Soil with Various Original Compactness and Water Content[J]. Journal of Changjiang River Scientific Research Institute. 2019, 36(11): 91-97 https://doi.org/10.11988/ckyyb.20180284

References

[1] 包承纲. 非饱和土的性状及膨胀土边坡稳定问题[J].岩土工程学报,2004,26(1):1-15.
[2] 程展林, 龚壁卫. 膨胀土边坡[M].北京:科学出版社,2015:65-66.
[3] 卢再华, 陈正汉. 膨胀土干湿循环胀缩裂隙演化的CT试验研究[J]. 岩土力学,2002,23(4):417-422.
[4] 袁俊平, 殷宗泽, 包承纲. 膨胀土裂隙的量化手段与度量指标研究 [J].长江科学院院报,2003,20(6):27-30.
[5] GREVE A K, IAN ACWORTH R, KELLY B F J. Detection of Subsurface Soil Cracks by Vertical Anisotropy Profiles of Apparent Electrical Resistivity[J]. Geophysics, 2010, 75(4): WA85-WA93.
[6] 黎伟, 刘观仕, 汪为巍, 等.湿干循环下压实膨胀土裂隙扩展规律研究[J].岩土工程学报, 2014, 36(7): 1302-1308.
[7] 马佳, 陈善雄, 余飞, 等. 裂土裂隙演化过程试验研究[J]. 岩土力学, 2007, 28(10):2230-2208.
[8] 李雄威, 冯欣, 张勇. 膨胀土裂隙的平面描述分析[J]. 水文地质工程地质, 2009, 36(1):96-99.
[9] 张家俊, 龚壁卫, 胡波, 等. 干湿循环作用下膨胀土裂隙演化规律试验研究[J]. 岩土力学, 2011, 32(9): 2729-2734.
[10]唐朝生, 崔玉军, TANG Anh-minh,等. 膨胀土收缩开裂过程及其温度效应[J]. 岩土工程学报, 2012, 34(12): 2181-2187.
[11]刘春, 王宝军, 施斌,等. 基于数字图像识别的岩土体裂隙形态参数分析方法[J]. 岩土工程学报, 2008, 30(9): 1383-1388.
[12]黎伟,刘观仕,姚婷.膨胀土裂隙图像处理及特征提取方法的改进[J].岩土力学,2014,35(12):3620-3626.
[13]曹玲, 王志俭, 张振华. 降雨-蒸发条件下膨胀土裂隙演化特征试验研究[J]. 岩石力学与工程学报, 2016, 35(2): 413-421.
[14]许锡昌, 周伟, 陈善雄. 南阳重塑中膨胀土脱湿全过程裂隙开裂特征及影响因素分析[J]. 岩土力学, 2015, 36(9): 2569-2576.
[15]王军, 龚壁卫, 张家俊,等. 膨胀岩裂隙发育的现场观测及描述方法研究[J]. 长江科学院院报, 2010, 27(9):74-78.
[16]HILLEL D. Introduction to Soil Physics[M]. New York: Academic Press, 1982.
[17]WILSON H W, FREDLUND D G, BARBOUR S L. Coupled Soil-Atmosphere Modeling for Soil Evaporation[J]. Canadian Geotechnical Journal, 1994, 31:141-152.
[18]唐朝生, 施斌, 顾凯. 土中水分的蒸发过程试验研究[J].工程地质学报,2011(6): 875-881.
[19]李彦龙, 王俊, 王铁行. 温度梯度作用下非饱和土水分迁移研究[J]. 岩土力学, 2016, 37(10): 2839-2844.
[20]郑飞. 不同压实度黏性土微细观孔隙结构研究及分形表征[D].武汉:湖北工业大学,2014.