Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants |
Natural disaster science
|Research Institution||Ritsumeikan University (2006)|
National Research Institute for Earth Science and Disaster Prevention (2004-2005)
SAKAI Hisakazu Ritsumeikan Univ., Center of Excellence for Disaster Mitigation of Urban Cultural Heritage, Associate Prof, COE推進機構, 助教授 (00360371)
TOBITA Yoshio Tohokugakuin Univ., Faculty of Eng., Prof., 工学部, 教授 (40124606)
YOSHIDA Nozomu Tohokugakuin Univ., Faculty of Eng., Prof, 工学部, 教授 (50405891)
YAMAGUCHI Akira Tohokugakuin Univ., Faculty of Eng., Associate Prof., 工学部, 助教授 (30337191)
KOBAYASHI Yoshikazu Nihon Univ., College of Science and Technology, Associate, 理工学部, 助教授 (20339253)
PULIDO Nelson National Research Institute of Earth Science and Disaster Prevention, Disaster Prevention System Research Center, Researcher, 防災システム研究センター, 研究員 (90333343)
末富 岩雄 独立行政法人防災科学技術研究所, 地震防災フロンティア研究センター, 副チームリーダー (30414402)
澤田 純男 京都大学, 防災研究所, 教授 (70187293)
ブリード ネルソン 独立行政法人防災科学技術研究所, 地震防災フロンティア研究センター, 研究員
|Project Period (FY)
2004 – 2006
Completed (Fiscal Year 2006)
|Budget Amount *help
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2006: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 2005: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2004: ¥5,800,000 (Direct Cost: ¥5,800,000)
|Keywords||tensile failure / constitute model / hollow-cylindrical torsional shear test / liquefaction / tension crack / particle method / river dike / large deformation / 動的モデル / 短周期地震動 / 地震応答解析 / 土構造物 / 2次災害 / 脆性挙動 / 有限要素法 / 広帯域強振動予測|
(1)We studied about the effect of the change and hysteresis of anisotropic elastic constants, on the stress-strain relationship and the crack
The Ortiz model should be improved in case of cyclic loading.
Accumulation of experimental data on vulnerability and ductility characteristic of soil is necessary for the establishment of the constitutive model.
The number of cracks of soil on the reversed loading tests is larger than in the case of the repeated loading tests, for equal amplitude, hollow-cylindrical torsional shear tests.
The relationship between the area of crack and the shear stiffness is strong and is independent of the amplitude of shear test and the difference between the reversed and repeated loading test.
The tensile crack has a strong influence on the strength and deformation of soil.
(2)Tensile splitting tests of kaolinite clay for different loading rates, show that soil has a larger tensile strength during faster loading. We consider that this effect is induced by suction.
(3)We performed 2 dimensional FEM analyses for liquefaction-induced deformation for river dikes based on liquefiable soil layers. The results show that the seismic evaluation by the current methods may overestimate the river dikes safety during a subduction earthquake, and therefore application of the cumulative damage concept is necessary for the seismic evaluation.
(4)Our results suggest that the evaluation methodology based on fault rupture process and site effect is useful for the damage estimation of embankments spread over a wide area.
(5)We developed the deformation analytical methodology based on the moving particle semi-implicit method for the large deformation estimation of embankment considering tensile failure. Our methodology may be applied for the evaluation of deformed shape of a miniature model with liquefiable ground.