ABSTRAKLongsoran terjadi di Jalan Tol Cipularang Km. 91+200 dan Km. 92+600. Longsoran terjadi karena adanya pergerakan pada lapisan batu lempung (clay shale), sehingga perlu adanya penanganan longsoran secara tepat dan efektif. Penanganan yang dipilih, yaitu dengan pemasangan perkuatan lereng berupa boredpile dan dinding penahan tanah. Dimensi boredpile yang digunakan yaitu berdiameter 80 cm. Analisis dilakukan dengan menggunakan Program Plaxis 2D yang berbasis metode elemen hingga, dengan memodelkan 2 (dua) kondisi yaitu kondisi eksisting dan kondisi dengan perkuatan. Analisis pada kondisi eksisting dilakukan dengan cara back analysis, sehingga hasil analisis kondisi eksisting sesuai dengan kejadian di lapangan. Analisis dilakukan di 6 (enam) titik untuk Km. 91+200 dan 2 (dua) titik untuk Km. 92+600. Dari hasil analisis didapat bahwa dengan adanya perkuatan pada lereng yang terjadi kelongsoran, nilai faktor keamanan naik hingga 242.2% dari kondisi eksisting.Kata Kunci: Longsor, Tol Cipularang, Km. 91+200 dan 92+600, Boredpile, etode Elemen Hingga, faktor keamanan ABSTRACTThe landslide are occurred at Cipularang toll road Km. 91+200 and Km. 92+600. The landslide occur because of the movement of clay shale soil layer, it means should be handled witih appropriate and effective way. For this case, reinforcement slope using boredpile and gravity wall are choosen. Dimension of the boredpile is 80 cm. The analysis was calculated using Plaxis 2D with finite element method with two different type of calculating model : existing condition (without reinforcement) and with reinforcement condition. Analysis for existing model are done by back analysis method that will gave the real condition from the field. The analysis are done by calculated in 6 (six) point area of slope for Km. 91+200 and 2 (two) point area of slope for Km. 92+600. The safety factor (SF) of the slope will increase up to 214% after reinforcement.Keywords: Landslide, Cipularang Toll Road, Km. 91+200 and 92+600, Boredpile, Finite Element Method, Safety Factor
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