2015 Fiscal Year Annual Research Report
Mechanisms of liquefaction-prone initial stresses in embankments caused by formation of arch and damage-resistant materials requirements against excessive basal settlement
| Project/Area Number |
25820213
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
ピパットポンサー ティラポン 京都大学, 工学(系)研究科(研究院), 准教授 (10401522)
|
|---|
| Project Period (FY) |
2013-04-01 – 2016-03-31
|
| Keywords | アーチ効果 / 土質力学 / 盛土 / 荷重分布 / 模型実験 / 下界定理 / 地盤沈下 / 締固め土 |
|---|
| Outline of Annual Research Achievements |
Active and passive limits in sand heaps provide a fundamental knowledge on arch action under two extreme conditions. In the present study, the lower bound limits of an infinite wedge were analyzed using the Newton method. To validate the results, a series of 1G physical models of an embankment inclined at angle of repose was conducted. Dry silica sand no.6 was used to build the embankment by pouring from the sieve source. Four tests were conducted with different conditions of maximum settlement and hysteretic reversals. Yielding in the embankment was induced by the settlement and uplift of the stiff base physically hinged together at the center. As the basal deflection was slightly increased, the central pressure significantly decreased. Once the base was upturned, the central pressure gradually increased. Though hysteretic reversals were applied in the experiments, active and passive limits were reasonably consistent with measurements in a certain range of deformation.
|
