Perencanaan Perbaikan Tanah deengan Metode Sand Column Pembangunan Jalan Primer pada Proyek Akatara Gas Plant Facility

Abstract

The Akatara Gas Plant Facility project is built on soft ground, this is certainly a problem that will affect construction. Soft soil has low bearing capacity, small shear force, large compressibility, small permeability coefficient value and large compression. An effective improvement to overcome problems in soft soil is strengthening the soil by installing sand columns. This research aims to plan soil improvement with sand columns, determine the stability of the soil before and after the sand columns are installed, and the amount of settlement before and after the sand columns are installed. The sand column is planned using a triangular pattern, with a diameter of 0.6 m, a distance of 1 m, and a depth of 6 m. Based on the analysis results, the stability of the subgrade and embankment before the sand column was installed collapsed because the SF value was < 1. After the sand column was installed, soil stability increased with an SF value of 1.267. The soil subsidence by manual calculation before the sand column was installed was 119,4 cm and decreased after the sand column was installed to 10,216 cm. The carrying capacity of the sand column is 120,461 kN/m2, which is greater than the total load on the original soil, namely 75,895 kN/m2. The sand column also affects the consolidation time because after the sand column is installed the length of time decreases.