LIQUEFACTION-INDUCED DAMAGE CAUSED BY M 9.0 EAST...
Transcript of LIQUEFACTION-INDUCED DAMAGE CAUSED BY M 9.0 EAST...
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LIQUEFACTION-INDUCED DAMAGE CAUSED BY M 9.0 EAST JAPAN MEGA EARTHQUAKE ON MARCH 11, 2011
Ömer AYDAN
Tokai University, Shizuoka, Japan
Takahiro IWATATE
Tokyo Metropolitan University
Hisataka TANO
Nihon University, Koriyama, Japan
With Collaborations of Save-Earth Co. and Waseda University
April 9, 2011
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CONTENT
1) Investigated Locations
2) Focal Mechanism and Strong Ground Motions
3) Ground liquefaction and its effects
4) Liquefaction-induced damage in Tokyo Bay Area
5) Liquefaction-induced damage in Ibaraki Prefecture
6) Liquefaction-induced damage in Fukushima Prefecture
7) Liquefaction-induced damage in Miyagi Prefecture
8) Liquefaction-induced damage in Iwate Prefecture
9) Comparison of observations with empirical relations
10) Misinterpretations of sand-boils in abandoned lignite mine areas
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Modified from Google Map
N
Investigation Routes
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Focal Mechanism and Strong Ground Motions
Focal Mechanism Maximum ground acceleration
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Ground Liquefaction and its effectsGround liquefaction and lateral spreading occurred wherever soils prone to liquefaction exist. The ground liquefaction caused heavy damage to lifeline facilities and structures particularly in reclaimed areas.
I) Effects of ground liquefaction on ground surface
a) Ondulation of ground surface
b) Non-uniform settlement
c) Lateral spreading
II) Effects of ground liquefaction on lifelines and structures
a) Uplift of light structures
b) Settlement of heavy structures
c) Stretching or compression of linear structures due to lateral
spreading (pipes etc.)
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Investigated liquefaction locations in Tokyo Bay Area
1) Shin-Kiba (extensive liquefaction)
2) Shin-Urayasu (extensive liquefaction)
3) Maihama (Disneyland) (various extents of liquefaction)
4) Daiba (very limited liquefaction)
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Shin-Kiba
JR Shin-Kiba St.
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Shin-Urayasu-1
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Shin-Urayasu-2
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Shin-Urayasu-3
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Shin-Urayasu-4
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Shin-Urayasu-5
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Shin-Urayasu-6
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Maihama (Disneyland-Disneysea)-1
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Maihama (Disneyland-Disneysea)-2
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Maihama (Disneyland-Disneysea)-3
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Maihama (Disneyland-Disneysea)-4
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Liquefaction-induced damage in Ibaraki Prefecture
The authors have particularly investigated ground liquefaction and liquefaction-induced damage in the Northern Ibaraki Prefecture between Oarai and Hitachi. However, it is reported that extensive ground liquefaction occurred in Kashima, Hokota, Itako along Tone River in the Southern Ibaraki.
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Liquefaction in Northern Ibaraki
NakaOarai
HitachiAjigaura
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Liquefaction-induced failure of sand dune in Tokai-mura
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RoadwayLiquefaction-induced damage in Tokai-mura
Lifelines
Tilted Building
Manhole
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Liquefaction-induced damage in Ajigaura
Roadway
Tank
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Damaged Nakaminato Thermal Power Plant due to heavy liquefaction
Tilted Chimney
Uplifted conveyor underpass
Thermal Power Plant
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Failed Quay of Hitachi Port
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Failed roadway in Hitachi due to lateral spreading
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Liquefaction-induced damage in Fukushima Prefecture
Liquefaction and its effects were directly observed by the authors in Koriyama and Iwaki. Besides the observations by the authors, there are reports that ground liquefaction in Sukawa and Shirakawa (H. Tano, Personal Cummunication)
IwakiKoriyama
Note the settlement of ground around the buildings
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Liquefaction-induced damage in Miyagi Prefecture
Sendai-KNET
Sand boils in Sendai
City
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Effects of ground liquefaction in Sendai City-1
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Effects of ground liquefaction in Sendai City-2
Tilted buildings due to pile damage in liquefied ground
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Ground liquefaction effects in other places in Miyagi Prefecture
Natori
Tomiya
Kesennuma
Onagawa
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Liquefaction-induced damage in Iwate Prefecture
Rikuzentakata Mizusawa
Ichinoseki
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Comparison of observations with empirical relations
1) Grain-size distribution approach
2) Empirical Vmax-Displacement approach
3) Magnitude-Limit Distance Approach
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Comparison of grain-size distribution of boiled sand with empirical bounds
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Comparison of Aydan’s empirical relation between maximum ground velocity and lateral spreading displacement
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Comparison of Empirical relation between earthquake magnitude and liquefaction limit distances
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Misinterpretations of sand-boils in abandoned lignite mine areas
Some sinkholes occurred in abandoned lignite mine areas due to sloshing of ground water in abandoned mines and subsequent collapse of the roof layers. As sandy material together with fragments of rocks and lignite appears, it is sometimes mis-interpreted as ground liquefaction.
Ejection of sandy material from a sinkhole in Ohira