In Urayasu City, where about 85% of the city area liquefied during the 2011 Great East Japan Earthquake, water pipes were seriously damaged due to liquefaction. Joints of water pipes were pulled out at many sites. Shaking continued at a long predominant period for a long time after the occurrence of liquefaction during the earthquake. So, the long-period shaking of liquefied ground, which was a kind of sloshing must cause large cyclic compressional and tensile strain to the water pipes in horizontal direction near some boundaries, resulting in the disconnection of the pipe joints. Then seismic response analyses were carried out to demonstrate the concentration of horizontal tensile strain at 5 areas in Urayasu City under four levels of shear modulus by considering the effect of liquefaction. Analyzed results showed large tensile strain induced near the site where the water pipes were pulled out.
This study is reasonable liquefaction prediction of Urayasu in case of the Great East Japan Earthquake based on RSPM. In the one-dimensional seismic response analysis use RSPM, the actual measurement and analysis value of maximum surface acceleration were congruous on the natural deposition ground. However, it was confirmed at the reclaimed land that maximum acceleration become small. In order to carry out reasonable liquefaction prediction in case of a trench type great earthquake, it was confirmed that it is necessary to take into consideration the regionality of a liquefaction strength ratio and the influence of a long-time continuation earthquake motion.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.