The Correlation of Soil Liquid Limit and Plasticity Index for Predicting Soil Susceptibility: A Case Study on Landslides area in South Sulawesi
Asmita Ahmad(a*), Christianto Lopulisaa(a), A.M. Imran(b), Sumbangan Baja(a)

Hasanuddin University

Abstract

This research aims to analyze characteristic of liquid limit and plasticity index of soil to predict soil susceptibility on landslides area in four district of South Sulawesi which have a high intensity of landslides event. Soil sampling was done in sixteen soil profile on A, B, and C horizon. The experiment used split-split plot design with three replications. ASTM-D method was used for calculation the liquid limit, plasticity limit and index plasticity. The average value of liquid limit in landslides area was 67.91%, plasticity limit was 52.22%, and index plasticity was 16.23%. Statistical test showed a correlation between landslides event with soil characteristic on each horizon with significant at P < 0.05. The least significant difference test showed the correlation between landslides event with soil characteristic on A and B horizon, and not significant on C horizon. The Soil with 67.91% of liquid limit value and 16.22% of index plasticity classified as a silt of high plasticity with low cohesiveness, and it is very susceptible to trigger a landslide

Keywords: liquid limit, plasticity index, soil, landslides, susceptible

Topic: Disaster analysis