Numerical analaysis on sinkhole stability induced by rainfall
- Authors
- Lee, Taegeon; T.; Nam; B.H.; Youn, Heejung; H.
- Issue Date
- 2019
- Publisher
- J and N Group, Ltd.
- Citation
- Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP, v.2019-March, pp.164
- Journal Title
- Proceedings of the Symposium on the Application of Geophyics to Engineering and Environmental Problems, SAGEEP
- Volume
- 2019-March
- Start Page
- 164
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/12713
- ISSN
- 1554-8015
- Abstract
- Sinkholes are more reported to occur during rainfall seasons rather than dry seasons, especially after long drought seasons. However, the stability of underground cavity is known to increase with ground water table rise because of the decrease in the effective stress. The changes in the ground water table resulting from heavy rainfall does not explain the frequent sinkhole occurrence; other geohydrological factors have to be accounted for the reduction in cavity stability. In this study, the cavity stability was numerically evaluated considering the effect of the dissipation of negative pore water pressure, head difference between the cavity and surrounding soil, and the increase in overburden pressure above the cavity due to rainfall. The finite element analysis software, PLAXIS, was adopted for stability calculation, and the Hardening Soil model was used to define the stress-strain behavior of soils. In order to simulate the behavior of unsaturated soils, the van Genuchten model was adopted for Soil Water Characteristic Curve, and the negative pore water pressure was simulated accordingly. The variation of cavity stability with rainfall duration was calculated for different head difference and the increase in the overburden pressure. Considering the heavy rainfall and the three geohydrological factors, the cavity stability was found to significantly decrease with time, indicating that geotechnical simulation should account for not only the change in pore water pressure resulting from rain fall but also the change in head difference and overburden pressure. © (2019) by Environmental and Engineering Geophysical Society All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Civil and Environmental Engineering > Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.