Characteristics of Rainfall-Induced Slope Instability in Cisokan Region, Indonesia

Authors

  • Sugeng Krisnanto 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
  • Harianto Rahardjo School of Civil & Environmental Engineering, Nanyang Technological University, Blk. N1, #1B-36, 50 Nanyang Avenue, Singapore 639798

DOI:

https://doi.org/10.5614/j.eng.technol.sci.2021.53.5.4

Keywords:

rainfall-induced slope instability, field observation, numerical analysis, unsaturated soil

Abstract

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.

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2021-10-22

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