scholarly journals Analysis of coastal structure damaged by the 2011 Off the Pacific Coast of Tohoku Earthquake - Field investigation and numerical simulation -

2016 ◽  
Vol 2 (73) ◽  
pp. 2498-2503
Author(s):  
Tsuneo Ohsumi ◽  
Hemanta Hazarika ◽  
Tadashi Hara ◽  
Kentaro Kuribayashi ◽  
Shuichi Kuroda ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Field Investigation ◽  
Coastal Structure ◽  
The Pacific

Performance of Piled Raft Foundation with Grid-Form Ground Improvement During the 2011 off the Pacific Coast of Tohoku Earthquake

2012 ◽  
Vol 7 (6) ◽  
pp. 726-732 ◽  
Author(s):  
Akihiko Uchida ◽  
◽  
Kiyoshi Yamashita ◽  
Nobuyuki Odajima ◽  
Keyword(s):  
Pacific Coast ◽  
Simulation Analysis ◽  
Ground Improvement ◽  
Tohoku Earthquake ◽  
Field Investigation ◽  
Soil Liquefaction ◽  
Tokyo Bay ◽  
Reclaimed Land ◽  
Piled Raft Foundation ◽  
The Pacific

Grid-form ground improvement by the deep cement mixing method is one of the countermeasures against soil liquefaction. Improvements by this method were confirmed during the southern Hyogo Prefecture Earthquake in 1995. The number of building foundations adopting this method has increased in the last years. During the 2011 off the Pacific coast of Tohoku Earthquake, which occurred on March 11, severe liquefaction damage was observed in reclaimed land in the Tokyo Bay area. Since then, liquefaction countermeasures have been recognized to be important to reclaimed land. A building foundation improved by grid-form ground improvement method is introduced in this paper. Field investigation results of ground around the building after the 2011 earthquake are presented. The effect of liquefaction prevention on gridform ground improvement is discussed based on dynamic nonlinear analysis of soil layers with actual acceleration records. Comparing field investigation results to simulation analysis, we concluded that gridform ground improvement prevented liquefaction of original soil surrounded by grid-form walls during the 2011 earthquake.

Numerical Analysis of Liquefaction in a River Levee on Soft Cohesive Ground

2012 ◽  
Vol 7 (6) ◽  
pp. 711-717 ◽  
Author(s):  
Ryosuke Uzuoka ◽  
◽  
Keita Semba
Keyword(s):  
Numerical Simulation ◽  
Static Analysis ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Moisture Distribution ◽  
Coupled Analysis ◽  
Initial State ◽  
State Of Stress ◽  
The Pacific ◽  
Moisture Conditions

During the 2011 off the Pacific coast of Tohoku earthquake, liquefaction at the bottom of embankments extensively damaged river levees in the Tohoku and Kanto areas. This study presents preliminary numerical simulation of liquefaction in a river levee on soft cohesive ground along the Eai River during the earthquake. Static analysis reproduced the initial state of stress and moisture in such an embankment before the earthquake. Static analysis showed a decrease in mean effective stress and an increase in water content at the bottom of the embankment due to the settlement of soft cohesive ground. The effect of initial stress and moisture conditions on the seismic responses of the river levee are discussed through dynamic threephase coupled analysis with an initially deformed configuration and moisture distribution. Numerical results showed that stress relaxation in the embankment caused an increase in settlement at the crest of embankment.

scholarly journals Seawater-leaching Testing for Arsenic and Heavy Metals in Tsunami Deposits Produced by the 2011 off the Pacific Coast of Tohoku Earthquake, Northeastern Japan

2014 ◽  
Vol 123 (6) ◽  
pp. 835-853 ◽  
Author(s):  
Takahiro WATANABE ◽  
Noriyoshi TSUCHIYA ◽  
Shin-ichi YAMASAKI ◽  
Ryoichi YAMADA ◽  
Nobuo HIRANO ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pacific Coast ◽  
Tohoku Earthquake ◽  
Tsunami Deposits ◽  
Northeastern Japan ◽  
The Pacific
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