Analisis Stabilitas Bendung (Studi Kasus : Bendung Tamiang)

Abstract

The objective of This study is to analyze the stability of a weir. The weir that is used to analyze is Tamiang weir. This weir is located in Kotanopan Mandailing Natal District of North Sumatra Province. This weir is in Batang Gadis River flow and included in Batang Gadis river flow area. In this study case, the methodology that is used are, the first times is calculating the forces that work against the body of weir. The forces that form the weir body, hydrostatic pressure, mud pressure and seismic. After getting the data, then, these forces are accumulated in four components, they are the vertical forces, horizontal forces, torque resistant, and bolsters moments. From the vertical and horizontal forces will obtain the figure of safety factor for sliding, while the resistant moments and overturning moments will obtain the figure to safety factor for overturning. The input data on this study are the hydrology data, soil data, and weir drawing design. While the output of the safety factor against shear numbers and figures to bolster the safety factor. The results that obtain in this study are 2,35 for sliding safety factor and 3,33 for overturning. Those two results are higher than the stability that required with the minimum safety factor is equal to 1.5. In conclusion Tamiang weir is stable, secure against overturning and sliding