Damage to small earth dam and pipeline by the Mid Niigata Prefecture [Japan] Earthquake in 2004
2006
Mohri, Y.(National Inst. for Rural Engineering, Tsukuba, Ibaraki (Japan)) | Hori, T. | Matsushima, K. | Ariyoshi, M.
A number of agricultural structures in a area Nagaoka, Ojiya and Kawaguti in Niigata, Japan, were seriously damaged by the Mid Niigata Prefecture Earthquake in 2004. Immediately after the earthquake, emergency investigations of small earth dams and pipelines were carried out in a large area around the epicenter, and National Institute for Rural Engineering (NIRE) made inspection visits to agricultural facilities, small earth dams, pipelines and canals in order to make clear the damage on its structure and make a emergency countermeasure work against preventing the second disaster on surroundings. Their results are described in this reports. The investigation by NIRE confirmed that there were some damages to small earth dams, including the slip failure of down side slope for dam, settlement of dike, failure by over topping, float up for buried pipelines and inspection manholes by liquefaction around back fill materials for pipeline. Finally these investigation results outline the structural aspects of earthquake damage to small earth dams and pipeline and propose the method for developing the reinforced counter measure work.
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