REVIEW OF TOPOGRAPHIC AND SOIL CONDITIONS FOR LIQUEFACTION-RELATED DAMAGE INDUCED BY THE 2007 OFF MID-NIIGATA EARTHQUAKE

SOILS AND FOUNDATIONS

HIROYOSHI KIKU⁷  KEIZO UGAI²  SUSUMU YASUDA⁶  YOSHINORI HOSAKA³  TAKAMI INOTSUME⁹  YOSHIMICHI TSUKAMOTO¹  HIROFUMI TOYOTA⁸  SUGURU YAMADA⁴  AKIHIKO WAKAI²  ATSUO ONOUE⁵  IKUO TOWHATA⁴ 

[1] Department of Civil Engineering, Tokyo University of Science;Department of Civil Engineering, Gunma University;Department of Civil Engineering and Architecture, Niigata University;Department of Civil Engineering, the University of Tokyo;Koa Kaihatsu Inc.;Department of Civil and Environmental Engineering, Tokyo Denki University;Department of Civil Engineering, Kanto Gakuin University;Department of Civil and Environmental Engineering, Nagaoka University of Technology;Department of Civil Engineering, Nagaoka National College of Technology

关键词: damage;    earthquake;    flood plain;    hinterland;    interview;    liquefaction;    liquefaction factor of safety;    sand dune;    slope failure;    Swedish Weight Sounding;    (IGC: C7/D7);   

DOI  :  10.3208/sandf.51.533

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(13)Cited-By(2)The 2007 Niigata-ken Chuetsu-oki (Off Mid-Niigata) earthquake caused the liquefaction of the sandy soil distributed near the coast of the Japan Sea in the middle of Niigata Prefecture. The liquefaction-induced damage occurring in many residential areas was investigated in detail by means of victim interviews, visual inspections, Swedish Weight Sounding tests, Standard Penetration Tests, old topographical map examinations, etc. Based on in situ soil investigations, the liquefied soil layers were estimated for each area. As a result, it was confirmed that the liquefied areas were mainly sand dune hinterlands, flood plains, reclaimed old river channels and sandy fills with high groundwater table. Among them, damage was especially serious on land having an inclined ground surface due to the flow of foundations, on the cut-fill borders of artificially developed land due to landslides and at the toes of sand dune slopes due to the thrust of the sliding soil and/or the collision of the sliding soil with objects. These investigation results also revealed that soil improvement by cement mixed columns is an effective countermeasure against liquefaction-induced damage unless lateral spreading of the subsoil arises.

【 授权许可】

Unknown