| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2013: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
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| Outline of Final Research Achievements |
In order to obtain soil samples from the foundation soil just below a highway embankment where in-situ air injection had been conducted to desaturate the ground as a liquefaction countermeasure, a simple and cheap ground freezing method has been developed. Frozen samples will be taken from the ground wi the method in a near future to directly measure distribution of degree of saturation.
The durability of the desaturated soils, which is one of the concerns of the technique, depends on the sustainability of the injected air in the soil pore. To evaluate the evolution in degree of saturation (which ensures the longevity of injected air) numerical simulations were conducted considering advection and the molecular diffusion process of mass transfer by using the multiphase flow simulation model (TOUGH2) based on the finite difference method (FDM). It is confirmed that the unsaturated condition of the site will last more than 200 years.
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