Failure mechanism of canal slopes of expansive soils considering action of wetting-drying cycles

被引：0
|
作者：
Cai Z.-Y. [1 ]
Chen H. [1 ,2 ]
Huang Y.-H. [1 ]
Zhang C. [1 ]
机构：
[1] Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing
[2] College of Civil and Transportation Engineering, Hohai University, Nanjing
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 11期
关键词：
Canal slope; Centrifugal model test; Expansive soil; Wetting-drying cycle;
D O I：
10.11779/CJGE201911001
中图分类号：
学科分类号：
摘要：
The canal of expansive soils is in the state of wetting-drying cycle because of seasonal water level fluctuations, and its slope instability is easily induced. The centrifugal model tests are carried out to study the stability of a canal slope of expansive soils under wetting-drying cycles, and its failure mechanism is investigated. It is found that the soil of the canal slope undergoes various wetting-drying cycles due to the repeating water level fluctuations in the canal. After each cycle, the cracks in the soil gradually expand, the water in the canal infiltrates continuously, and the saturated area gradually increases. The stronger the expansive capability of foundation soils, the more severe the crack extension after each wetting-drying cycle, the stronger the infiltration of canal water, and the more easily the canal is destroyed. The main failure mode of the canal caused by wetting-drying cycles of water level fluctuations is shallow instability, which is quite different from the retrogressive landslide discovered by other researchers. © 2019, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：1977 / 1982
页数：5
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