Laboratory model tests on capillary barrier infiltration using actively heated fiber optic method

被引：0
|
作者：
Wang J.-C. [1 ]
Zhu H.-H. [1 ,2 ]
Wang J. [1 ]
Cao D.-F. [3 ]
Su L.-J. [2 ]
Reddy N.G. [1 ,4 ]
机构：
[1] School of Earth Sciences and Engineering, Nanjing University, Nanjing
[2] Key Lab. of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu
[3] School of Civil Engineering, Sun Yat-sen University, Guangzhou
[4] School of Infrastructure, Indian Institute of Technology Bhubaneswar, Bhubaneswar
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2021年 / 43卷 / 01期
关键词：
Actively heated fiber optic method; Capillary barrier; Rainfall infiltration; Sand model experiment;
D O I：
10.11779/CJGE202101017
中图分类号：
学科分类号：
摘要：
The capillary barrier effect is a natural phenomenon during the infiltration of unsaturated soil layers with different particle sizes. In order to test the capillary barrier effect of multi-layer soils, laboratory model tests are designed. Subsequently, the actively heated fiber optic (AHFO) method is used to test the water migration of the model tests, and the direct observation method and the frequency domain reflection (FDR) technology are used for verification. The analysis of test shows that compared with the direct observation method and the FDR method, the AHFO method has a better observation effect on the capillary barrier phenomenon caused by rainfall infiltration, and can observe more details of water movement as well. The FDR method is used to perform the in-situ calibration of the AHFO sensor, and the curve-fitting accuracy R2 is greater than 0.93, indicating a high accuracy of volume water content monitoring. The capillary barrier layer has a significant retarding effect on rainfall infiltration, that is, infiltration water can be saved at the storage barrier which can also reduce seepage to the layer under the barrier. The research results may provide a new method for the research on capillary barrier effect and the monitoring of water content distribution. © 2021, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：147 / 155
页数：8
相关论文
共 38 条
  • [1] AU S W C., Rainfall and slope failure in Hong Kong, Engineering Geology, 36, 1, pp. 141-147, (1993)
  • [2] KASSIM A, GOFAR N, LEE L M, Et al., Modeling of suction distributions in an unsaturated heterogeneous residual soil slope, Engineering Geology, 131, pp. 70-82, (2012)
  • [3] LEE M L, NG K Y, HUANG Y F, Et al., Rainfall-induced landslides in Hulu Kelang area, Malaysia, Natural Hazards, 70, 1, pp. 353-375, (2014)
  • [4] JONES D D, ROWE R K., BTEX migration through various geomembranes and vapor barriers, Journal of Geotechnical and Geoenvironmental Engineering, 142, 10, (2016)
  • [5] TAN S H, WONG S W, LEE M L, Et al., Soil column infiltration tests on biomediated capillary barrier systems for mitigating rainfall-induced landslides, Environmental Earth Sciences, 77, 16, (2018)
  • [6] JIAO Wei-guo, ZHAN Liang-tong, JI Yong-xin, Et al., Field test and study on water storage capacity of loess-gravel capillary barrier cover, Chinese Journal of Geotechnical Engineering, 41, 6, pp. 1-10, (2019)
  • [7] RAHARDJO H, GOFAR N, HARNAS F, Et al., Effect of geobags on water flow through capillary barrier system, Geotechnical Engineering Journal of the SEAGS & AGSSEA, 49, 2, pp. 1-6, (2018)
  • [8] ZASLAVSKY D, SINAI G., Surface hydrology: IV Flow in sloping, layered soil, Journal of the Hydraulics Division, 107, 1, pp. 53-64, (1981)
  • [9] HO C K, WEBB S W., Capillary barrier performance in heterogeneous porous media, Water Resources Research, 34, 4, pp. 603-609, (1998)
  • [10] ROSS B., The diversion capacity of capillary barriers, Water Resources Research, 26, 10, pp. 2625-2629, (1990)
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