Abstract

The Mandalika circuit in Lombok is a potentially liquefied area. The liquefaction mitigation used to strengthen the soil in the circuit with Rigid Inclusion reinforcement is the installation of rigid elements such as concrete blocks into the soil to increase its strength and stability. Therefore, it is necessary to evaluate the effectiveness of the mitigation carried out. The research method was analyzed using numerical Plaxis V20 to find the Safety Factor (SF) and pore water pressure ratio (Ru) in the original and reinforced soil models. Data used to support numerical analysis are Standard Penetration Test (SPT) and soil propperties data from the laboratory. The modeling in this study uses a rigid inclusion with a diameter of 0.5 meters, the distance between the poles is three times the diameter with a total of 11 poles. Above the rigid inclusion is a Load Transfer Platform (LTP) of gravel with a depth of 2.5 meters. The results of the analysis show that the use of rigid inclusion is effective in reducing the risk of liquefaction in Mandalika Circuit where SF increases on average up to 36%.