Analisis Stabilitas Lereng Menggunakan Matras dan Cerucuk Bambu pada Projek X

Abstract

The construction of PT. X' depot in Langsa City, Aceh, is located on soft clay soil that requires slope stability analysis for the embankment. This research aims to analyze slope stability using bamboo mattresses and piles as reinforcement to improve the safety factor. The analysis was conducted using manual calculations (Bishop method) and GeoStudio software (also using the Bishop method), under both static conditions and seismic influence (pseudostatic approach with a horizontal seismic coefficient (kh) = 0.18). The manual calculation results showed that the unreinforced slope had a safety factor (SF) of 1.1428 < 1.25 (unstable), which decreased to 0.6711 < 1.1 (unstable) under seismic load. Meanwhile, the GeoStudio software analysis indicated that the unreinforced slope had an SF of 1.256 > 1.25 (stable) but dropped to 0.903 < 1.1 (unstable) under seismic load. The use of 1–4 layers of bamboo piles and matting increased the SF to 1.318–1.35 without seismic influence. Under seismic conditions, the SF of the slope reinforced with 1–4 layers of bamboo piles and matting improved to 0.931–0.97. However, the slope was still considered critical during an earthquake (SF < 1.1).