EVALUASI GEOMETRI JALAN ANGKUT BATUBARA DARI FRONT MENUJU STOCKROM DI PT. CAHAYA RIAU MANDIRI JOB SITE DUTA ALAM SUMATERA KABUPATEN LAHAT PROVINSI SUMATERA SELATAN

Abstract

PT. Cahaya Riau Mandiri, a coal mining company located in Lahat Regency, South Sumatra Province, conducted research at the High Wall site of PT. Duta Alam Sumatera. The coal mining system used is surface mining (open pit). The loading equipment used in coal transportation is a Komatsu PC 400 Excavator. The distance from the mining front to the StockROM is ± 1,700 meters. The standard road width on a straight path is 9.75 meters, the standard road width on a curve is 15.72 meters, the standard road slope is 8%, the standard cross slope ranges from 39 cm – 53.6 cm, and the standard superelevation is 0.16 – 0.19 meters. Road geometry improvements were made as follows: For straight road widths on segments C-D and J-K, widening was carried out by ± 7 meters, and for road widths on curves on segments E-F, H-I, I-J, K-L widening was carried out by ± 2-8 meters. The cross slope on each segment on the Front-A segment was raised by 0.17 meters, segment B-C was raised by 0.34 meters, segment C-D was raised by 0.19 meters, segment D-E was raised by 0.9 meters, segment F-G was lowered by - 0.41 meters, segment J-K lowered by - 0.15 meters, so it is necessary to improve the cross slope. Superelevation on segment A-B needs to increase superelevation by 0.04 m, segment G-H needs to reduce superelevation by -0.43 m, segment H-I needs to increase superelevation by 0.02 m, segment I-J needs to reduce superelevation by -0.05 m, segment K-L needs to reduce superelevation by -0.03 m. Road maintenance was also carried out using a grader. The average productivity of the Mercedes-Benz Axor 2528 CH dump truck is 100.467 tons/month with a production target of 120,000 tons/month.