Soil Nailing Application for Railways Track Safety on Slope Area

Abstract Railways track at KM 25+100 - KM 25+200 from Jember to Banyuwangi is constructed next to slope area with inclination angle 69°. As railways track mapping report, this area is categorized as a high-potential landslide area that can harm train travel. By using soil nailing method with threaded steel and embedded into the soil for grouting, slope stabilization be improved. Undisturbed soil sampling on 1.5 m depth was carried out and tested to determine soil parameters. Based on the USCS soil classification, the soil at the site is an organic clay with high plasticity. Soil parameters are used to calculate the slope safety factor before and after soil nailing application with the best reinforcement design. By utilizing Plaxis 2D CE V20 Bentley software and manual calculations with the bishop method for comparison, the potential landslide before reinforcement resulted a safety factor value of 1.198 by using Plaxis and 0.97 by calculated manually. Some soil nailing reinforcement planning design is obtained and resulted that soil nailing design with diameter 29 mm, slope angle application on 20° with distance between nail bar at 1m, and nail length 9m have best safety factor value at 1.548. With the best design and >1.5 SF value, the soil nailing design is safe against landslides risk.