POTENSI LIKUEFAKSI BERDASARKAN DATA UJI SWEDISH WEIGHT SOUNDING DI DESA WAWOPADA DUSUN 2 KECAMATAN LEMBO KABUPATEN MOROWALI UTARA

LIQUEFACTION POTENTIAL BASED ON SWEDISH WEIGHT SOUNDING TEST DATA IN WAWOPADA VILLAGE, HAMLET 2, LEMBO DISTRICT, NORTH MOROWALI REGENCY

Oktavina Randalongi, Ida Sri Oktaviana, Hendra Setiawan

ABSTRACK

Wawopada Village, Hamlet 2, Lembo District, North Morowali Regency is one of the areas with soil and geological conditions that are potentially susceptible to liquefaction during earthquakes. Specific soil characteristics and the presence of groundwater can increase the likelihood of liquefaction when seismic activity occurs. This study aims to identify soil characteristics and analyze the liquefaction potential in Wawopada Village, Hamlet 2, Lembo District, North Morowali Regency using the Swedish Weight Sounding (SWS) method. Field tests were conducted at 10 points (P1-P10) using SWS equipment to obtain values of Nsw, N-SPT, qa, and qu. In addition, laboratory tests were carried out, including grain size analysis, Atterberg limits, and soil unit weight, to determine the soil characteristics at the study site. The SWS test results show that Nsw values range from 0.00-454.55 n/m, N-SPT values range from 0.10-29.92, qa values range from 0.00-393.64 kN/m², and qu values range from 2.25-385.91 kN/m² across all test points. Liquefaction potential analysis was conducted based on the factor of safety (FS), considering earthquake loading parameters with a maximum ground acceleration (amax) of 0.34 g and an earthquake magnitude of 7.4 Mw. The analysis results indicate FS values ranging from 0.16-1.51. FS values less than 1 suggest that at certain depths the soil is susceptible to liquefaction, while FS values greater than 1 indicate relatively safe conditions. Based on the analysis, most depths at test points P1-P10 show FS < 1, leading to the conclusion that Wawopada Village, Hamlet 2 has the potential to experience liquefaction at specific depths during an earthquake with amax of 0.34 g and magnitude of 7.4 Mw. This study is expected to serve as a consideration in development planning and mitigation efforts against liquefaction hazards in the study area.
Keywords: Liquefaction, SwedishWeight Sounding, Tsuchida, Wawopada, North Morowali