Abstract:
Geotechnical assets such as slopes, rock-cuts, retaining wall and embankments are as an important element supporting transportation systems. Investigation and mapping of numerous slopes (potential to failure) are crucial reducing risk hazards impose to highway users. The research aims are to investigate and mapping landslides or rockfalls hazard rating. The investigation method is based on the Rockfall Hazard Rating System (RHRS) developed by ODOT, 1996. The investigated slopes are located on the highway sections Pekanbaru (Riau) - Taluk Kuantan (Riau) – Kiliran Jao (Riau) –Dharmasraya (Sumatera Barat), Muaro Bungo (Sumatera Barat) - Sarolangun (Jambi) – Lubuk Linggau (Jambi) – Lahat (Sumatera Selatan) (830 km).
It was identified, 109 slopes prone to rockfall. Of which 15 slopes were classified as potentially landslide/ rockfall hazard ones. There were three the highest score of RHRS slopes are as follow; RHRS of 475 (at KM 609.2), RHRS 451 (at KM 136), RHRS 413 (KM 215.5) respectively. Various factors determine the hazard scores are also identified such as; slope heights, ditches, highway wide, average vehicle risks (AVR), block sizes, precipitation, and rockfall history. Based on the RHRS method, the higher the RHRS scores, the more prioritized they are to remedy.
