Perencanaan Penggunaan Dinding Penahan Tanah Tipe Kantilever Dan Gravitasi

Planning the Use of Cantilever and Gravity Type Retaining Walls

Abstract

Retaining walls are an important element in maintaining slope stability, especially in areas with topographic conditions prone to landslides. This study discusses the planning of the use of cantilever and gravity retaining walls on roads in Sukodono Village, Gresik Regency, East Java. The analysis was carried out using the Coulomb method by considering the stability of shear, overturning, and soil bearing capacity based on sondir test data. The calculation results show that on a cantilever retaining wall with a height of 5.00 m, a foundation width of 3.00 m, and a foundation thickness of 0.50 m, the safety factor obtained for shear stability is 19.29 (> 1.50), overturning 1.79 (> 1.50), and soil bearing capacity 8.71 (> 3.00) so that it is declared safe. Meanwhile, on the gravity type retaining wall with a height of 5.00 m, a foundation width of 5.80 m, and a foundation thickness of 0.70 m, the safety factor for shear stability was 77.57 (> 1.50), overturning 1.77 (> 1.50), and the soil bearing capacity with piles was 800.57 kN (> 384.4 kN). Comparison of the cost budget plan (RAB) shows that the construction of a 250 m long cantilever type retaining wall costs Rp 3,547,049,000.00, while the gravity type costs Rp 3,870,526,000.00. Thus, the cantilever type retaining wall is considered more economical and efficient to be applied at the research location.