PERENCANAAN STONE COLUMN UNTUK MENINGKATKAN DAYA DUKUNG TANAH TERHADAP POTENSI LIKUIFAKSI (STUDI KASUS BADAN JALAN SIRKUIT INTERNASIONAL MOTOGP MANDALIKA LOMBOK TENGAH STA 3+800 – 4+100)

The Mandalika MotoGP circuit is coastal with sandy soil characteristics and a tendency that loses its shear resistance to seismic forces, resulting in liquefaction. There have been 1,001 earthquake cases on the Lombok island in the last 100 years on the large earthquake case measuring 6.9 Magnitude on July 29, 2018. This plan aims to assess the potential for local soil damage to potential liquefaction, planned soil improvement using the stone column method, and create a budget plan for soil improvement using the stone column method. By analysis of local soil liquefaction potential using the Liquefaction Potential Index (LPI) method, the stone columns have planned and evaluated using three methods, namely the Baez and Martin method (1993), the Priebe method (1995), and the Baez method (1995). RAB was reviewed based on the need for split stone materials and in the use of tools in the form of a combination of vibroflot, crawler crane, and wheel loader. Thus, the analysis found that 5 of the top 6 local soil layers with a thickness of 16 m have a Liquefaction Index (IL) in the very high classification that liquefaction occurs, so soil improvement measures are needed. In conclusion, the result of the stone column regards the design and evaluation, a configuration that needs a diameter of 80 mm for a triangular pattern and a spacing of 2.40 m that determined a total of 1120 installation points. The budget plan needs to install a stone column with this configuration is Rp. 11,885,903,052.80