Increase in Safety Factor Value in Existing Conditions and Reinforcement of Gabion Type Retaining Wall Pt. Medco E&P Malaka Block A

Civil Engineering, Syiah Kuala University, 23111 Darussalam, Indonesia

^* Corresponding author: nir.geotecnical@unsyiah.ac.id

Abstract

Indonesia is an archipelagic country with 34 provinces, which has a diverse soil profile and geological structure. This condition is an area where a slope is formed. The slope is a sloping land surface and forms a certain angle and has no force in resisting the occurrence of a slide. Landslide is a disaster that can cause casualties. Collapse (slide) occurs as a result of a driving force greater than the opposite force originating from the shear strength of the soil. The slide occurred at PT. Medco E&P Malaka Block A, Ranto Perlak District, East Aceh Regency, Aceh Province in the Siwah flow ROW STA 2+400. Landslides occur as a result of high rain intensity resulting in landslides. The safety factor analysis on the slopes was carried out using the Strength Reduction Method (SRM). In the existing conditions, the slope experienced a collapse (slide) with an SF value of 1.15, which did not meet the requirements of the safety factor value (SF≥ 1.25). Therefore, reinforcement was carried out on this slope by constructing a Gabion type retaining wall construction with a height of 3 m and a width of 1.5 m. From the analysis with Gabion type retaining wall reinforcement, the SF value was 1.51 which fulfilled the requirements of the Safety factor when strengthening (SF≥ 1.5). From this analysis, it was found that the SF value was different in the existing conditions, the SF value was 1.15 and in the strengthening condition, the SF value was 1.51. Where the SF value increases by 0.36 or 32%.