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http://dx.doi.org/10.5762/KAIS.2019.20.12.737

A study on applicability of volumetric water content to predict shallow failure  

Suk, Jae-Wook (Disaster Prevention Research Division, National Disaster Management Research Institute)
Song, Hyo-Sung (Disaster Prevention Research Division, National Disaster Management Research Institute)
Kang, Hyo-Sub (Disaster Prevention Research Division, National Disaster Management Research Institute)
Kim, Ho-Jong (Disaster Prevention Research Division, National Disaster Management Research Institute)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.12, 2019 , pp. 737-746 More about this Journal
Abstract
Most landslides in the country are shallow failures triggered by intense rainfall. Many researchers have revealed the possibility of predicting shallow failure through the volumetric water content (VWC). This study examined how to determine shallow failure using the gradient characteristics of the volumetric water content. For this, flume experiments were conducted using weathered granite soil. To confirm the saturation state of the surface layer under a rainfall intensity of 30 and 50mm/hr, VWC sensors were installed at depths of 10 and 20 cm on the upper, middle and lower slope. The test results showed that a shallow failure determination using VWC could be applied limitedly according to the slope degree. In addition, the effective cumulative rainfall due to the rainfall infiltration velocity is considered the main factor for the failure time. The failure prediction using the gradient of the VWC depends on the installation location and depth of the sensor. According to the experimental data, the measured value at 20 cm below the slope was most effective. Therefore, an analysis method of VWC and the method of selecting the installation location confirmed through this study can provide important data for presenting the measurement criteria using VWC in the future.
Keywords
Volumetric Water Content; Shallow Failure; Rainfall Intensity; Criteria; Flume Test;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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