Characteristics of rainfall-induced slope instability in Cisokan Region, Indonesia
Krisnanto S. Rahardjo H. Kartiko R.D. Satyanaga A. Nugroho J. Mulyanto N. Santoso P. Hendiarto A. Pamuji D.B. Rachma S.N.
4 October 2021Institute for Research and Community Services, Institut Teknologi Bandung
Journal of Engineering and Technological Sciences
2021#53Issue 5
A 25.5 km long access road has been constructed in a hilly area in Cisokan region. Several slope instabilities occurred during the rainy season, particularly at the end of heavy rainfall. A comprehensive study was performed to understand the characteristics of rainfall-induced slope instability. The study consisted of field observation, analyses of field and laboratory test data, and numerical analyses. The study revealed that in general there were two categories of slopes with instability characteristics: (i) slopes with a significant groundwater level increase during rainfall; (ii) slopes with an insignificant groundwater level increase during rainfall. In the first category, the slope instability was caused by a loss of matric suction and eventually the pore-water pressure, uw became positive as indicated by an increase of the groundwater level. In the second category, the slope instability was caused by a loss of matric suction without a rise in pore-water pressure, uw, to a positive magnitude. Two empirical curves of slope stability were developed as a preliminary guidance to assess slope stability during rainfall in the region.
Empirical slope stability curve , Field observation , Numerical analysis , Rainfall-induced slope instability , Unsaturated soil
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Geotechnical Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, CIBE Building Level 5, Room CIBE 0506, Jalan Ganesa No. 10, Bandung, 40132, Indonesia
School of Civil & Environmental Engineering, Nanyang Technological University, Blk. N1, #1B-36, 50 Nanyang Avenue, Singapore, 639798, Singapore
Applied Geology Research Group, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jalan Ganesa No. 10, Bandung, 40132, Indonesia
Department of Civil and Environmental Engineering, Nazarbayev University, 53 Kabanbay Batyr Ave, Nur-Sultan, 010000, Kazakhstan
Water Resources Engineering Research Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, CIBE Building Level 5, Room CIBE 0531, Jalan Ganesa No. 10, Bandung, 40132, Indonesia
Prima Layanan Nasional Enjiniring, Jakarta, 12310, Indonesia
Civil Engineering Program, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Jalan Ganesa No. 10, Bandung, 40132, Indonesia
Geotechnical Engineering Research Group
School of Civil & Environmental Engineering
Applied Geology Research Group
Department of Civil and Environmental Engineering
Water Resources Engineering Research Group
Prima Layanan Nasional Enjiniring
Civil Engineering Program
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