Pengaruh Variasi Diameter Tiang Bor pada Perkuatan Lereng Ruas Jalan Tawaeli-Toboli KM 59+175

Abstract

The Tawaeli - Toboli Km 59 + 175 road section, it is an area prone to landslides caused by unstable road slopes. The chronology of landslides on the slopes of the Tawaeli – Toboli Km. 59 + 175, namely during the rainy season, the landfill on the slope shifts so that it carries the original soil material up to the shoulder of the road, it causes disruption to traffic flow and can endanger drivers. This study was conducted by analyzing the stability of the slope strengthened with a cantilever walls and combined with drill piles with varying diameters, namely D40, D60 and D80. The results of the calculation of the safety factor on the slopes is 1,364 which is not sufficient, so it needs to be strengthened additional, namely using bore piles with varying diameters, namely D40, D60 and D80. For the safety factor at D40 is still considered critical, namely 1.488 < 1.5 and D60 at 1.629 > 1.5 and D80 1.849 > 1.5. The results of the overall analysis show that the slopes of the Tawaeli – Toboli Km. 59 + 175, during extreme conditions or moist soil conditions caused by rainwater, it is very vulnerable to landslides so that it needs to be strengthened in the form of a cantilever wall with a wall height of 5 meters and additional deep foundations using bore piles with a diameter of 60 cm, itis considered efficient in strengthening the slope.