Abstract:
The road infrastructure network in the Balangan Regency is almost mostly located on the side of
the hillside and river cliffs which is risky to erosion and landslide of the road on cliffs. Almost every year there
are landslides occures which result in the cut off of road access, especially the roads that are located on the side
of the river cliff. The implementation of river cliff reinforcement in Balangan is currently limited to counterfort
retaining wall construction and concrete sheet pile. In fact, with the development of the construction technology
there are several alternative river cliff reinforcement constructions that can be applied in Balangan Regency.
The purpose of this study is to analyze the risk of two river cliff reinforcement constructions methods. The
selected implementation construction is sheet pile construction which is the existing construction in Balangan
Regency and cantilever wall construction which is proposed as an alternative to river cliff reinforcement
construction. The risk analysis method used is the risk analysis of construction projects based on probability
impact matrix. As the results of the risk analysis obtained sheet construction has an average risk level of 4.25.
The cantilever wall construction has a lower risk level of 3.72. In general, both construction of cliff
reinforcement do not have a high level of risk. However, sheet pile construction has more medium level of risk
compared to cantiever wall construction. Therefore, based on the risk analysis results, it is recommended to use
cantilever wall construction as river cliff reinforcement method that can be applied in Balangan Regency.
