Analysis of the mechanisms of slope failures triggered by the 2007 Chuetsu Oki earthquake

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Title Analysis of the mechanisms of slope failures triggered by the 2007 Chuetsu Oki earthquake
Author Gratchev, Ivan; Towhata, Ikuo
Journal Name Geotechnical and Geological Engineering
Year Published 2011
Place of publication Netherlands
Publisher Springer Netherlands
Abstract The 2007 Chuetsu Oki earthquake (MJMA = 6.6) triggered more than one hundred slope failures in the northwest part of Niigata prefecture, Japan. A reconnaissance survey conducted by the authors revealed that althoughmost of the failures were only a few meters deep, they still caused significant damage to roads, railways, and houses. Itwas also found that a vast number of shallow slides were concentrated along the coastal line of the Japan Sea, while only few, but relatively larger failures occurred in a mountainous part of the study area, which is located in a considerable distance from the earthquake’s epicenter. This paper summarizes the reconnaissance observations, describes the geologic characteristics of the area covered by landslides, provides characterization of major types of the landslides, and examines the causes andmechanisms of typical failures. In addition, this paper seeks to investigate the mechanism of the Ohzumi landslide, the largest slide triggered by the Chuetsu Oki earthquake. For this purpose, a comprehensive analysis that included field investigation and laboratory testing of soils samples was performed. Results of field investigation suggested that the failure plane of the Ohzumi landslide formed in a saturated layer of sandy soil near a boundary with bedrock. Data from undrained cyclic loading triaxial compression tests indicated that the sandy material was highly susceptible to generation of high excess pore-water pressures during earthquake loading. On the basis of the obtained results and the outcome of seismic response and slope stability analyses, the authors posited an explanation on the mechanism of the Ohzumi landslide.
Peer Reviewed Yes
Published Yes
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Copyright Statement Copyright 2011 Springer Netherlands. This is an electronic version of an article published in Geotechnical and Geological Engineering, 2011, 695-708. Geotechnical and Geological Engineering is available online at: with the open URL of your article.
Volume 29
Issue Number 5
Page from 695
Page to 708
ISSN 0960-3182
Date Accessioned 2011-06-23
Language en_US
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Civil Geotechnical Engineering
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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