| Budget Amount *help |
¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
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| Outline of Final Research Achievements |
This study investigated issues on soil liquefaction after the 2011 off Pacific Coast of Tohoku Earthquake based on comprehensive laboratory tests. The aging effects of soils on liquefaction and small strain characteristics were investigated. A rational liquefaction assessment method could be developed based on not only SPT-N value but also the small strain characteristics. In addition, we pointed out a problem of current liquefaction assessment with an undisturbed soil sample taken by conventional tube sampling method. This study also verified experimentally the effects of flyash on liquefaction resistance buildup and excavatability of the improved soil. Finally, we conducted a simple liquefaction assessment in Urayasu city, and the relationship between liquefaction potential and road subsidence were extracted based from the DSMs. Based on the result, an attempt was made to apply the obtained PL and road subsidence relations to attain a unique hazard map.
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