2012 Volume 68 Issue 4 Pages 707-719
The cut slope reinforced earth method is a restraining technique used to stabilize slopes by constructing bar reinforcements in the natural ground to form an earth reinforcement structure. As materials for this method can be procured easily and the work is simple, the self-supporting ability of slopes may be improved in a short period. But there are concerns that the deterioration of grout and erosion of steel bar cores in the ground will gradually lower the performance of the reinforcement structure. Up to now, the true state of the deterioration has not been clarified, and neither has the long-term durability of cut slopes strengthened by the reinforced earth method (hereinafter, reinforced cut slope). A number of reinforced cut slopes on expressways were selected to carry out studies to find answers to these issues. This document reports on the degree of corrosion of the steel reinforcement bars and the effectiveness of galvanization for rust-proofing, found in the studies, and suggests maintenance methods to achieve long-term durability of reinforced cut slopes.