Analysis of potential liquefaction using cone penetration test data and grain size distribution test with case study of liquefaction in Lolu Village

Abstract

Liquefaction is a rare natural disaster and is very closely related to geotechnical engineering, where it occurred i\ the city of Palu in 2018 ago. One of the Palu liquefaction areas is Lolu Village, which experiences a sizeable lateral movement of up to 150 m. The research aims to identify the potential liquefaction in Lolu Village using the Cone Penetration Test (CPT) data and grain size distribution test. In evaluating liquefaction potential, the CPT data is processed with the Idriss-Boulanger method, referring to the value of soil safety factors based on the ratio between ground resistance to liquefaction (CRR) and earthquake (CSR). Whereas grain size distribution tests are carried out based on ASTM, referring to soil type composition’s influence on the level of liquefaction potential. The results from eight CPT in Lolu village shows that liquefaction potential occurs at a depth of 5 to 10 m with varying end resistance and friction ratio values of the soil. Likewise, grain size distribution tests indicate that soil types are dominated by sandy soils vulnerable to liquefaction.