| Budget Amount *help |
¥44,720,000 (Direct Cost: ¥34,400,000、Indirect Cost: ¥10,320,000)
Fiscal Year 2016: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2015: ¥11,050,000 (Direct Cost: ¥8,500,000、Indirect Cost: ¥2,550,000)
Fiscal Year 2014: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2013: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Outline of Final Research Achievements |
In the underground sequestration of CO2 (carbon dioxide), large amount of CO2 is injected into rock mass. Since CO2 becomes supercritical state in the deep underground and it is very slick, it is necessary to access effect of the injection on stability of surrounding rock mass. In our study, we injected CO2 into a hole drilled around 10 m long from the floor of a tunnel in a mountain with monitoring of AE (Acoustic Emission: elastic wave radiated with rock fracturing). The results indicated that the AE sources with the CO2 injection distributed larger than those with the water injection. However, with time elapsing after the CO2 injection, AE events that seemed to be caused by crack closing started to be observed. Since these AE events are most likely associated with degassing in the cracks without rock fracturing, it seems that they never bring instability to the surrounding rock mass even if they distribute large.
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