Analisis Numerik Pengaruh Beban Hujan dan Gempa pada Stabilitas Lereng Tanah Tak Jenuh
DOI:
https://doi.org/10.5614/jts.2024.31.2.8Keywords:
Dynamic analysis, Negative pore water pressure, Seepage analysis, slope deformation, unsaturated slopeAbstract
Abstract
Rain and earthquake affect the stability of the slope. Rain results in infiltration on the slope which causes a decrease in negative pore water pressure on the slope and increases the groundwater level. Meanwhile, the seismic load from earthquake causes deformation on the slopes. Slope will experience even more critical condition if the effects of rain and earthquake are combined. This study aims to determine the influence of rain followed by earthquake on the stability of the unsaturated slope. This study consists of two stages of numerical analysis, which are seepage analysis to determine changes in pore water pressure on the slope and followed by non-linear time history dynamic analysis to calculate the deformation that occurs due to the ground motion. The soil-water characteristic curve from the field measurement will be incorporated in the upper layer of unsaturated soil and the Loma Prieta (1989) earthquake acceleration recording will be used. Six scenarios of rain followed by earthquake will be analyzed and compared, which are the scenario of rain intensity not changing for three days, the scenario of rain intensity gradually increasing and decreasing gradually, and the scenario of random rain intensity.
References
Doi, I., dan Kamai, T. (2020). Relationship between earthquake-induced excess pore water pressure and strong ground motion observed in a monitored fill slope. Engineering Geology.
Hamdany, A.H.; Wijaya, M.; Satyanaga, A.; Rahardjo, H.; Qian, Z.; Lim, A.; Kim, J. Numerical Simulation on the Effect of Infiltration and Evapotranspiration on the Residual Slope. Sustainability 2023, Vol 15.
Wang, C.-H., Fang, L., Chang, D. T.-T., & Huang, F.-C. (2023). Back-analysis of a rainfall-induced landslide case history using deterministic and random limit equilibrium methods. Engineering Geology.
Xu, J., Ueda, K., & Uzuoka, R. (2022). Numerical modeling of seepage and deformation of unsaturated slope subjected to post-earthquake rainfall. Computers and Geotechnics.
Yang, S.-R.; Huang, L.-J. (2023). Infiltration and Failure Behavior of an Unsaturated Soil Slope under Artificial Rainfall Model Experiments. Water 2023, Vol 15.
Yeh, H.-F., & Tsa, Y.-J. (2018). Effect of Variations in Long-Duration Rainfall Intensity on Unsaturated Slope Stability. Water 2018, Vol 10.
Yulin, L., Chen, X., & Wang, L. (2022). Analytical Computation of Sandy Slope Stability under the Groundwater Seepage and Earthquake Conditions. Hindawi Advances in Civil Engineering.
Zhai, Q., Tian, G., Ye, W., Rahardjo, H., Dai, G., & Wang, S. (2022). Evaluation of unsaturated soil slope stability by incorporating soil-water characteristic curve. Geomechanics and Engineering, Vol. 28, 637-644.
Zhang, X., Huang, L., Hou, Y., Wang, B., Xue, B., & Shi, M. (2020). Study on the Stability of the Geogrids-Reinforced Earth Slope under the Coupling Effect of Rainfall and Earthquake. Hindawi Mathematical Problems in Engineering.
Zhang, Z., Chang, C., & Zhao, Z. (2020). Influence of the Slope Shape on Seismic Stability of a Slope. Hindawi Advance in Civil Engineering, Vol. 2020.
Zhao, L., Huang, Y., Chen, Z., Ye, B., & Liu, F. (2020). Dynamic failure processes and failure mechanism of soil slope under random earthquake ground motions. Soil Dynamic and Earthquake Engineering, Vol. 133.
