OPTIMAL COST OF SLOPE STABILIZATION WITH RETAINING WALL

Abstract

Optimal cost calculation is important to know the most economical wall type used in construction projects due to many types of ground retaining walls. The types of soil retaining walls often used in Indonesia are gravity, cantilever, and sheet pile. The selection of the soil retaining wall type is based on two factors: stability and cost. The purpose of this study is to compare the cost of gravity retaining walls, cantilevers, and sheet piles based on optimal dimensions. Optimal dimension calculation uses the Solver program in the Microsoft Excel application. Furthermore, cost calculations are carried out with material data, equipment, and labor wages based on the unit price of Padang City in 2021. The sheet pile retaining wall used is a type of corrugated sheet pile wall from PT. Jaya Sentrikon. From the results of the study, it is known that gravity retaining walls are the most efficient compared to cantilever and sheet pile retaining walls, but gravity is not safe for heights more than 7 m because it does not meet the requirements of internal stability. The cost of cantilever retaining walls is less expensive than sheet pile walls at a height of 8-14 m.