| dc.description.abstract | It has been investigated and evaluated that destructive pattern in Taichung Harbor and the Port and Rokko Island occurred during 1999 Chi-Chi earthquake and 1995 Hyogoken-Nambu earthquake. Destruction phenomenon can be divided into two parts: Lateral displacement, settlement, and inclination induced by the lost of bearing capacity in foundation soil below the caisson; another way, not only serious ground failure but also structure damages will be caused by lateral spreading and settlement of saturated cohesionless soil liquefaction behind the quay wall resulting from strong earthquake.
In this thesis, observed lateral displacement and settlement of the ground surface resulting from liquefaction in Taichung Harbor are described and evaluated in terms of the values estimated based on existing methodology. Finally, the outcome of an in-situ survey and the comparison between Taichung Harbor and Kobe Port on permanent deformations behind the quay wall are presented.
The numerical tool employed in the present study is FLAC, a two-dimensional explicit finite difference code for modeling soil, rock and structural behavior. The result conducted by static earth pressure analysis concluded that a lateral extension of as much as six times the wall height is required to eliminate the effect of the boundary condition for infinitely extended backfills. In addition, a perfect result compared with classical Coulomb earth pressure analysis theory is shown.
By dynamic analysis of caisson quay wall with FLAC, two goals are achieved. One is to understand how to conduct the dynamic analysis in FLAC when pore pressure generation and ground deformation is considered. Another is to verify the ability of FLAC to predict hazard in field model. For the numerical model, comparison between measured and computed model response were made. The result shows that ground deformation simulation is well done by using residual strength method in dynamic analysis. In addition, the displacement of quay wall and the pore pressure generation is greatly induced when dilation angle is increasingly applied in the backfill or foundation soil. | en_US |