Effect of Strong Motion on Liquefaction-Induced Settlement of Shallow Foundations Using 3D Numerical Analysis

다국어 초록 (Multilingual Abstract)

Liquefaction-induced settlement of shallow foundations is the result of bearing capacity failurein undrained conditions and sedimentary settlement during the post-liquefaction process. Thebearing capacity of a shallow foundation is highly dependent on the size and dimensions of itsfootprint. In addition, the reduction in shear strength in liquefiable soil, a key parameter forestimating bearing capacity, depends on the excess pore water pressure generated during anearthquake. This study aims to investigate the impact of earthquake motion on the extent ofliquefaction-induced settlement in shallow foundations. A parametric study was conducted byvarying the input earthquake motions in a three-dimensional response history analysis todirectly consider the interaction between the soil and superstructures. The numerical analysismodel constructed for the parametric study was rigorously calibrated using a referencedynamic centrifuge test in a prototype scale. The effects of the horizontal boundary anddrainage conditions in the numerical model were closely examined during calibration. Theparametric study results indicate that the intensity measures of an earthquake, which quantifythe energy associated with the number of reversals, exhibit a close correlation with theresulting liquefaction-induced settlement as opposed to other conventional earthquakemotion parameters, such as peak acceleration, magnitude, and frequency.