SLOPE STABILITY ANALYSIS WITH REINFORCED WALL HOLDER OF CANTILEVER AND MINIPILE TYPE
1*Banta Usman, Munirwansyah, Sofyan M Saleh
Central Aceh / Gayo Lues-Blangkejeren Border Road Section Km 438 + 800 located in the Gayo Lues Regency is one of the national cross-border roads that connect Takengon City with Gayo Lues Regency and Southeast Aceh towards North Sumatra. Landslides often occur due to landslides in mountainous areas. Landslide events that occur are caused by high rainfall intensity and water flow in the drainage of the road body and the absence of water flow direction building at the end of the drainage, so that water is wasted on the shoulder of the road and water seeps into the road body which can cause heavy soil volume to increase. This can increase the driving force to be large due to increasing soil mass on the slope's body. Thus, it is necessary to analyze the landslide and handling using retaining walls and mini piles. This analysis aims to determine the slip area on the slope and the safety factor figures. The analysis will be conducted to determine the slip area on the slope and the number of safety factors that is using the Plaxis Version 8.6 program. The results of the analysis of the slope stability in the existing conditions showed a safety factor of 1.087 with unsafe slope conditions. Thus, it is necessary to strengthen the slope using cantilever and minipile type retaining walls. The results of the stability analysis after being given reinforcement obtained a safety factor that is 1.205 with unsafe slope conditions. So that additional reinforcement is needed by adding the installation of retaining walls and minipile on both sides of the road body and anchor between retaining walls. The results of the stability analysis after additional reinforcement is obtained the safety factor figure is 1.748 with safe slope conditions.
Landslide, Plaxis Program, Retaining Wall, Minipile