Abstract:
This paper objectives are to; (i) identification of risky slopes (within 4 Provinces in
Sumatra including Provinces of Riau, West Sumatra, Jambi and South Sumatra encompassing 840
kms of the “Jalan Lintas Sumatra” highway) based on Rockfall Hazard Rating Systems (RHRS)
method; (ii) developing alternatives to stabilize slope hazards, and (iii) selecting appropriate slopes
stabilization techniques based on both proactive approach and value engineering one. Based on the
Rockfall Hazard Rating Systems (RHRS) method, it was identified 109 steep slopes prone to
failure within this highway section. Approximately, 15 slopes were identified as potential high-risk
slopes (RHRS scores were calculated >200 points). Based on the proactive approach, seven
riskiest slopes ware identified. The preferred stabilization alternatives to remedy most of these
slopes are suggested as follow; either (i) a combination of retaining wall and drainage, or (ii)
gabion structure and drainage. However, different approaches may yield different results, there are
at least 2 main consideration in prioritizing slope stabilization; (i) based on the riskiest slopes, and
(ii) the least expensive stabilization alternatives.
