https://scholars.lib.ntu.edu.tw/handle/123456789/576047
標題: | Geosynthetic-reinforced soil slopes with different backfills and reinforcements subjected to rainfall infiltration | 作者: | Nguyen T.-S Yang K.-H. KUO-HSIN YANG |
關鍵字: | Geotextiles; Infiltration; Rain; Sand; Silt; Slope stability; Soil moisture; Tensile strength; Capillary barrier effect; Critical rainfall thresholds; Geosynthetic reinforced soils; Geosynthetic reinforcement; Moisture conditions; Nonwoven geotextiles; Rainfall infiltration; Water characteristics; Reinforcement | 公開日期: | 2018 | 卷: | 4 | 起(迄)頁: | 3339-3353 | 來源出版物: | 11th International Conference on Geosynthetics 2018, ICG 2018 | 摘要: | This paper presents a numerical study to investigate hydraulic response and stability of geosynthetic-reinforced soil slopes (RSS) with different backfills and reinforcements subjected to rainfall infiltration. Three backfill materials (i.e. sand, silt, and silty clay), two geosynthetic reinforcements (i.e. geogrid or nonwoven geotextile), and two rainfall intensity (q = 350 and 500 mm/day) are evaluated. The backfills are modeled using three soil–water characteristic curves (SWCCs), representing the general suction range associated with sand, silt, and clay. The numerical results reveal that the initial suction has a significant contribution in enhancing slope stability of reinforced clay slopes at the beginning of infiltration; however, the stability of the reinforced clay slope considerably decreases due to the loss of matric suction and development of a capillary barrier effect at clay-geotextile interface as the rainfall infiltration proceeded. In contrast, the stability of the reinforced sand slope are minimally influenced by the change of soil moisture conditions. The numerical results also indicate that the reinforced marginal soil slopes cannot effectively drain the infiltrating water under given rainfall intensities. Free drainage conditions may not be assumed for these slopes if the drainage is not properly considered. The required reinforcement tensile strengths for the reinforced silt and clay slopes to maintain FS = 1.3 are approximately 3 and 4 times, respectively, larger than that for reinforced sand slopes. Finally, the relationships between the rainfall intensity (I) and rainfall duration (D) are established to determine critical rainfall thresholds when the failure of reinforced slopes occurs. The equation for critical rainfall thresholds (referred to I-D curve) of reinforced slopes with different backfills are proposed and compared. ? 2018 11th International Conference on Geosynthetics 2018, ICG 2018. All rights reserved. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099693426&partnerID=40&md5=9d5b1deb8e3600cb34ae9f433db11eb5 https://scholars.lib.ntu.edu.tw/handle/123456789/576047 |
顯示於: | 土木工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。