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Reinforced dike section using geogrid at its bottom met a damaging earthquake named the Tottoriken-Seibu Earthquake on October 6 2000. As there laid a loose sand layer beneath the 3m high dike, the section was constructed using geogrid sheets at its bottom to prevent an anticipated soil liquefaction in 1996. 4 years later, this section was hit by the earthquake, however, 80% of the treated length of the section survived without damage, 120m long section within the treated section subsided by about 1m. Settlement and groundwater table together with strong ground motion were kept to measure since the completion of the dike construction. Effectiveness of the geogrid reinforcement for small scale dike against soil liquefaction was examined using observed data and numerical analysis.
国際ジオシンセティックス学会日本支部の論文