SHAKING TABLE TEST ON COMPACTED SOIL TO REDUCE LIQUEFACTION POTENTIAL

Liquefaction is a granular soil material from a solid state to a liquid an increase in pore water pressure and a decrease in its effective stress. Liquefaction can cause loss of soil bearing capacity, damaging the construction above it. A simple shaking Table using a one-way vibrating Table is the tool used in this study. The earthquake accelerations used in this study are 0.3 g and 0.5 g earthquake accelerations repair method carried out in the form of compaction. Before the shaking Table test is carried out, laboratory tests are first carried out to determine the soil classification. the soil classification used in this study is SM. The purpose of this research is to determine the time of liquefaction on variations in grain size gradation and density on sand soil liquefaction with different earthquake acceleration. Based on the test results, poorly graded soil is the fastest to deformed. In 0.3 g earthquake acceleration performed total settlement of 10 mm at 100 seconds and a groundwater level in 7 mm at 15 seconds. An acceleration of 0.5 g performed total settlement of 12 mm at 10 seconds and a ground-water level in 7 mm at 15 seconds. The poorly graded soil is improved by compaction. The compacted soil in density of 17.838 kN/m³ performed settlement of 8 mm at 105 seconds and a groundwater level in 6 mm at 40 seconds in 0.3 g earthquake acceleration. The compacted soil in density of 17.995 kN/m³ performed 8 mm at 100 seconds and groundwater level in 7 mm at 20 seconds in 0.5 g earthquake acceleration. The compacted soil in density of 18.563 kN/m³ performed settlement 6 mm at the 100^th second and a groundwater level 6 mm at the 25^th second in 0.5 g earthquake acceleration. Based on the research results, compaction can reduce liquefaction potential.