ANALISIS REMBESAN DAN STABILITAS BENDUNGAN SARADAN

Abstract

Saradan Dam  is dams located in the Saradan sub-district, Madiun Regency, East Java Province. The Saradan Dam was built between 1942 by the Dutch East Indies Government, therefore to determine the safety of the dam it is necessary to review the seepage and stability of the current dam body. This study uses the Casagrande method to analyze seepage that occurs in the dam body and the Bishop method to analyze the stability of the dam body by adding the earthquake load coefficient factor OBE (Operating Basis Earthquake) and MDE (Maximum Design Earthquake). This research uses the help of the GeoStudio 2012  program for analysis of seepage and stability of the dam body under conditions of flood water level, normal water level, minimum water level, and rapid drawdown. The results of the analysis using Geostudio 2012 show that the safety factor for the stability of the Saradan dam body is in flood water level conditions without an earthquake 6,005 > 1,5 (Safe), OBE earthquake 3,452 > 1,5 (Safe), MDE earthquake 1,457 > 1 (Safe), then under normal water level conditions without an earthquake 5,037 > 1,5 (Safe), OBE earthquake 3,124 > 1,2 (Safe), MDE earthquake 1,407 > 1 (Safe), then at minimum water level conditions without an earthquake 2,541 > 1,5 (Safe), OBE earthquake 2,031 > 1,2 (Safe), MDE earthquake 1,245 > 1 (Safe), then at rapid drawdown conditions without an earthquake 1,899 > 1,3 (Safe), OBE earthquake 1,541 > 1,1 (Safe), MDE earthquake 0,973 > 1 (Safe).