2014 Fiscal Year Final Research Report
Effect of duration of earthquake motion on liquefaction of the ground
| Project/Area Number |
24560611
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Geotechnical engineering
|
|---|
| Research Institution | Ritsumeikan University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KOBAYASHI Taizo 福井大学大学院, 工学研究科, 准教授 (10380578)
YOKOYAMA Takaaki 立命館大学, 理工学部, 助手 (30562110)
|
|---|
| Project Period (FY) |
2012-04-01 – 2015-03-31
|
| Keywords | 液状化 / 時間依存性 / 加振時間 / 電気抵抗 / 過剰間隙水圧 / 細粒土 |
|---|
| Outline of Final Research Achievements |
A lot of big damage was induced by liquefaction even at the areas where it had not been judged to be induced on the conventional evaluation due to long duration of earthquake motion in Great East Japan earthquake, 2011. We suggest that a small size of liquefaction, induced at a local area due to the ununiformity in the ground, expands to neighboring area during a long duration of earthquake motion and that it induces the liquefaction widely. We made some experiments to inspect the supposition, observing the spatial propagation of the liquefaction phenomenon through the change of the electric resistance of the coal powder specimen under the vibration condition. Although we have not yet succeeded to confirm the supposing phenomenon, we observed that the liquefaction phenomenon is maintained in a long duration in fine grained soil and that the liquefaction can easily be induced even in the fine grained soil when earthquake motion continues for a long duration.
|
| Free Research Field |
地盤工学
|
