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Preventive Maintenance Technique of Reinforced Earth Retaining Wall Structures
The reinforced retaining wall was introduced in the late 1980s and has been actively used since the 1990s in Korea 's expressway construction. At the beginning of the introduction, proper stiffeners and backfill materials were used and compaction management was thoroughly carried out, which was recognized as an economical and excellent workability method. However, the current understanding of reinforced earth retaining walls about 30 years old is a negative image such as inadequate reinforcement materials, backfill materials, insufficient compaction, and insufficient drainage system. In this way, the reinforced earth retaining walls that have been constructed in the midst of the negative perception are about 1,000 at the expressway site, and about 1000 will be completed in a few years and about 2,000 will be used. Most of the problems of reinforced earth retaining wall were found during maintenance, and countermeasures are suggested by tracing back to what problems were observed in the design and construction of the observed phenomena. The retaining walls to be installed in future maintenance should be minimized in designing and constructing to prevent problems. It is estimated that such a problem can be solved by changing the recognition. Therefore, in this study, damage cases of reinforcement retaining wall which is frequently occurred in the expressway of Korea were analyzed to derive the preventive maintenance method of reinforced earth retaining walls. Then, the problems and countermeasures were analyzed for each type of damage.
