Technical and Economic Feasibility Study for Retaining Wall Construction on the Temuireng-Jetis Road Section in Mojokerto District

Abstract

The construction of retaining walls in Mojokerto Regency is critical due to its hilly terrain, which necessitates slope stabilization and landslide prevention, particularly along vital road infrastructure like the Temuireng-Jetis road section. This study compares the costs, stability, and implementation timelines of cantilever and gravity-type retaining walls to determine the most efficient solution for the region’s geotechnical challenges. Using the Coulomb theory method, secondary data, including topographic surveys, triaxial soil test results, and local construction unit price data, were analyzed to assess the viability, safety factors, and efficiency of these two types of retaining walls in the region. The findings reveal that the cantilever-type wall incurs a construction cost of IDR 3,413,190,216 and requires 61 days to complete, offering superior stability for areas with high lateral pressure. Meanwhile, the gravity-type wall costs IDR 2,556,275,865, requires 130 days for construction, and is more suitable for lower lateral pressure areas. The study's results offer valuable insights for cost-effective and time-efficient infrastructure development in regions with similar topographic challenges, emphasizing the importance of tailored solutions based on site-specific conditions. These findings can be applied in planning and designing retaining walls for slope stabilization, landslide mitigation, and long-term infrastructure sustainability, contributing to better engineering practices, optimized budgets, and efficient resource allocation in infrastructure projects.