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http://dx.doi.org/10.12814/jkgss.2022.21.2.031

Evaluation of the Depth of Improved Soil on Weathered Soil Slopes by Rainfall Duration  

Yu, Jin-Ju (Department of Civil Engineering, Daejin University)
Lee, Jong-Woo (Department of Civil Engineering, Daejin University)
Lee, Kang-Il (Department of Civil Engineering, Daejin University)
Publication Information
Journal of the Korean Geosynthetics Society / v.21, no.2, 2022 , pp. 31-38 More about this Journal
Abstract
Recently, irregular torrential rainfall have frequently occurred due to abnormal climate, and landslide damage is increasing. In Korea, more than 70% of the total land is mountainous areas, appropriate measures are needed to prevent landslides by heavy rainfall. When improved soil is applied to the surface of the slope, it is possible to suppress an increase in groundwater level due to rainfall penetration and secure stability of the slope. In this study, the appropriate depth of improved soil that can confirm the increase in groundwater level and secure stability by applying improved soil to the weathered soil slope was studied. A total of three cases were analyzed for the slope of the cross-section: standard slope for weathered soil (1:1.5, 1:1.8, and 1:2.0). For rainfall conditions, referring to the regional frequency probability rainfall provided by the Water resource Management Information System, the increase in groundwater level by stage was confirmed by assuming a 500-year frequency precipitation maximum duration of 48 hours. As a result of the study, in the case of natural slopes, the slope was completely saturated before 48 hours the rainfall duration, and there was a possibility of collapse. the improvement depth in the slope of 1:1.5 was appropriate for more than 1m from the surface regardless of the rainfall duration, and in the the slope of 1:1.8 was appropriate of 1m for more than 36 hours. in the slope of 1:2.0, it was appropriate for that safety when improved soil of 0.5m for rainfall duration 48 hours or more.
Keywords
Slope stability; Improved soil; Penetration analysis; Rainfall duration;
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