PERBEDAAN DIMENSI DINDING PENAHAN TANAH ANTARA ANALISIS KONVENSIONAL DAN ANALISIS MODIFIKASI Studi Kasus : Efisiensi dan Akurasi Perhitungan Dinding Penahan Tanah Dengan Metode Analisis Modifikasi

Abstract

Infrastructure development in contour areas like Ubud, Bali, requires precise structural planning, especially for retaining walls (DPT) to ensure slope stability and building safety. This study compares the results of DPT planning between conventional analysis methods and modified analysis, focusing on structural dimensions and construction cost efficiency. The conventional method uses a static approach based on Rankine's theory, while the modified method integrates additional variables like soil-structure interaction and groundwater conditions, aided by analysis software. A case study was conducted on the Villa Granada project in Banjar Sembuwuk, Gianyar, Bali. Calculations were performed for stability against overturning, shear, and soil bearing capacity, as well as cost analysis for each method. The results show that the modified method with slimmer structural dimensions still meets structural safety requirements with a safety factor value > 1.5. The base width of the DPT was reduced from 2 meters to 1 meter, significantly impacting material volume reduction and cost efficiency up to 46%. Thus, the modified method is proven to be more efficient and accurate, making it suitable for construction projects in areas with challenging soil conditions.