Maps of soil subsidence for Tokyo bay shore areas liquefied in the March 11th, 2011 off the Pacific Coast of Tohoku Earthquake

Konagai, Kazuo; Kamiya, Takashi; Suyama, Shota; Asakura, Toru; Shibuya, Kenichi; Eto, Chikako

doi:10.1016/j.soildyn.2013.06.012

Cited by 39 publications

(22 citation statements)

References 5 publications

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“…Liquefaction assessment was carried out based on the estimated soil parameters, and the spatial distribution of PL values estimated from 109 borehole logs was summarized as a map. Then, it was compared with corresponding values of road subsidence extracted from the liquefaction-induced ground subsidence map (Konagai et al, 2013). The result shows that the road subsidence increases with the increase in the PL value.…”

Section: Resultsmentioning

confidence: 99%

“…Values of road subsidence were extracted from the soil subsidence map (Konagai et al, 2013). The subsidence map (Fig.…”

Section: Extraction Of Road Subsidencementioning

confidence: 99%

“…Secondly, values of liquefaction potential (PL) were estimated at various locations in the city on a Geographic Information System (GIS). Thirdly, the extents of road subsidence were extracted in an exact manner from the soil subsidence map (Konagai et al, 2013), and compared with the estimated PL values to prepare a quantitative hazard map of liquefactioninduced road subsidence for Urayasu City.…”

Section: Introductionmentioning

confidence: 99%

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Liquefaction-induced ground subsidence extracted from Digital Surface Models and its application to hazard map of Urayasu city, Japan

Kajihara

Mohan

Kamiya

et al. 2016

JGS Special Publication

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The major problems associated with liquefaction-induced ground subsidence are tilting of houses, buckling of roads, lifelines cut off, etc. For the mitigation and preparedness over the liquefaction-induced damage, a detailed study on prediction of ground subsidence for future earthquake is important. On the 11 th of March 2011, the Off the Pacific Coast of Tohoku Earthquake (MW=9) hit Japan and caused severe liquefaction in Urayasu City, Chiba Prefecture. In this study, in order to investigate the relationship between liquefaction potential, PL, and liquefaction-induced subsidence which occurred in the 2011 earthquake, liquefaction assessment is first carried out by using a number of boreholes and relevant soil test data from Urayasu city. Then, the liquefaction-induced road subsidence is extracted from a set of the Digital Surface Models (DSMs) from airborne LiDAR (Light Detection And Ranging) surveys before (2006) and after (2011) the earthquake. The extracted subsidence from the DSMs indicates that the liquefaction-induced road subsidence is larger for the residential roads than that of the main roads, thus the relationship between PL and road subsidence is different for each type of road. Finally, an attempt is made to apply the obtained PL and road subsidence relations to attain a unique hazard map for Urayasu city.

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Section: Resultsmentioning

confidence: 99%

“…Values of road subsidence were extracted from the soil subsidence map (Konagai et al, 2013). The subsidence map (Fig.…”

Section: Extraction Of Road Subsidencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Liquefaction-induced ground subsidence extracted from Digital Surface Models and its application to hazard map of Urayasu city, Japan

Kajihara

Mohan

Kamiya

et al. 2016

JGS Special Publication

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“…[10][11][12][13][14][15]) showed that liquefaction occurred along the coast of Japan, although most of the traces were erased by the tsunami in the northern part. In spite of being more than 200 km away from the earthquake fault, the Kanto area was signiicantly afected, especially the Tokyo Bay, where there is a large extension of reclaimed land.…”

Section: Earthquakes -Tectonics Hazard and Risk Mitigationmentioning

confidence: 99%

New Insight in Liquefaction After Recent Earthquakes: Chile, New Zealand and Japan

Alberto-Hernandez¹,

Towhata²

2017

Earthquakes - Tectonics, Hazard and Risk Mitigation

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Liquefaction has proved to be one of the major geotechnical issues caused by earthquakes. It is one of the most costly phenomena and has afected several cities around the world. Although the topic has been studied since the 1960s, new questions are emerging. The earthquakes of Chile in 2010, New Zealand in 2010 and 2011, and Japan in 2011 had in common not only being some of the largest earthquakes of this decade but also having a problem of extensive liquefaction. Although most seismic codes have provisions against liquefaction, there are still some misconceptions regarding the characteristics of soil susceptibility and the efect of repeated liquefaction. This chapter introduces a detailed report of the damage caused by liquefaction in the cities afected by those earthquakes and also highlights observations in liqueied areas that were unexpected.Advanced geotechnical testing was conducted and compiled to compare them with previous assessment criteria and observations. A more comprehensive framework for the evaluation of liquefaction susceptibility and countermeasures will be presented and a roadmap of future work in the area will be described.

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“…An artificial fill in this disaster area classified as a volcanic sandy soil lost its effective stress under cyclic loading although the degree of saturation is about 70% [1]. In 2011, the landfills along the northeastern shorelines of the Tokyo Bay liquefied because of the Tohoku earthquake, which caused soil subsidence around an area of 42 km 2 [2]. Until now, questions have been raised about the liquefaction potential of unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

Fully undrained cyclic loading simulation on unsaturated soils using an elastoplastic model for unsaturated soils

Komolvilas

Kikumoto

2016

E3S Web Conf.

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Abstract. Several researchers have reported that Bishop's mean effective stress decreases in unsaturated soils under fully undrained cyclic loading conditions, and unsaturated soils are finally liquefied in a similar manner as saturated soils. This paper presents a series of simulations of such fully undrained cyclic loading on unsaturated soils using an elastoplastic model of the unsaturated soil. This model is formulated using the Bishop's effective stress tensor incorporating the following concepts: the volumetric movement of the state boundary surface containing the normal consolidation line and the critical state line due to the variation in the degree of saturation, a soil water characteristic curve model considering the effect of specific volume and hysteresis, the subloading surface model, and Boyle's law. Comparisons between the simulation results and the experimental ones show that the model agreed well with the unsaturated soil behavior under cyclic loading. Finally, the typical cyclic behavior of unsaturated soils under fully undrained conditions, such as the mechanism of liquefaction of unsaturated soils, the compression behavior, and an increase in the degree of saturation, are described through the proposed simulation results.

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Maps of soil subsidence for Tokyo bay shore areas liquefied in the March 11th, 2011 off the Pacific Coast of Tohoku Earthquake

Cited by 39 publications

References 5 publications

Liquefaction-induced ground subsidence extracted from Digital Surface Models and its application to hazard map of Urayasu city, Japan

Liquefaction-induced ground subsidence extracted from Digital Surface Models and its application to hazard map of Urayasu city, Japan

New Insight in Liquefaction After Recent Earthquakes: Chile, New Zealand and Japan

Fully undrained cyclic loading simulation on unsaturated soils using an elastoplastic model for unsaturated soils

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