Stability Analysis of Cantilever-Type Soil Retaining Wall Using Plaxis Method on Waipia-Saleman Road Section of Seram Island

Abstract

The  Waipia-Saleman  road  section  is  a  national  road  that  has  undulating  topographic conditions, natural conditions in the form of hills and valleys, this results in several road segments being on slopes. Most sides of the sp. Waipia- Saleman is a steep slope so there is a way point that experiences a landslide, avalanche occurs at Sta. 34+990 – 35+020 damages the roadside along 30 meters of avalanche depth variations of 5-7 meters. The design of the cantilever soil retaining wall structure was planned with a height of 4 meters and the design of the bored pile foundation was designed to withstand the load of the structure as much as 20 points with a distance of 1,5 meters. with a pile depth of 14 meters. This study aims to analyze the safe number of slopes by strengthening cantilever type soil retaining walls using the plaxis 8.2 program and modeling slope element nets using the plaxis 8.2 program. The results of manual calculations on slopes with cantilever DPT reinforcement using Rankine theory with external stability reviews obtained safe numbers SFGeser = 1,72 > 1.5 (safe), SFGuling = 2,58 > 1,5 (safe), and SFDaya dukung terhadap runtuh = 4,406 > 3 (safe). The results of calculating the safe number on the slope with the reinforcement of cantilever soil retaining walls using the plaxis 8.2 program obtained a safety factor value (SF) = 1,5803 > 1,5.