本研究は，地震動と波の相互作用を受ける盛土構造物の力学挙動に着目し，盛土の不安定化機構とその耐波性能を明らかにすることを目的とする．近年の甚大な災害被害を考えると，地震動と他の外的要因の影響を複合的に考慮する必要があり，より高度でかつ信頼性の高い評価法を提案することが急務であると言える．ここでは，二次元平面ひずみ模型土槽内に繰返し載荷履歴を与えることが可能な装置を開発し，地震動のような繰返し載荷を与えた条件下で造波模型実験を実施した．得られた結果から，盛土構造物の締固め条件ならびに波の作用条件の違いがその安定性に及ぼす影響を定量化し，盛土構造物の耐波・耐震に対する評価法の検討を行った．
In the 2011 off the Pacific coast of Tohoku Earthquake, serious damage due to great seismic loadings and subsequent tsunami occurred widely in Japan. It has been also reported that road embankments in Sendai-Tobu expressway play an important role to evacuate from tsunami. After that, evacuation places have been constructed in other expressways in Japan. This paper aims at clarifying wave-induced failure mechanism of volcanic embankments subjected to cyclic loadings such as seismic loadings. A series of model tests was performed on model volcanic embankments by using a cyclic loading and a wave paddle systems; especially the effects of compaction conditions and wave condition on failure of embankments were presented herein. Based on the test results, the development process of wave erosion and the evaluation of the stability of volcanic embankments due to wave loadings were discussed in detail.
地震動のような繰返し載荷履歴を受けた火山灰盛土の耐波性能評価
JSCE_73_2_I1141_I1146
(2.86MB)
