| dc.description.abstract | Taiwan is located in the Circum-Pacific seismic belt, typical continental edge islands produced by plate collisions. There have been many earthquakes in Taiwan over the years, and the soil liquefaction induced by the earthquake has caused many economic losses and casualties in western Taiwan. Therefore, in order to evaluate liquefaction hazard, liquefaction potential index (LPI) and a classification system were proposed by Iwasaki et al. (1982) for evaluating soil liquefaction potential. However, because the threshold is a descriptive assessment, this study aims to quantify the soil liquefaction probability based on a given LPI. Then, this thesis presents a new probabilistic procedure to evaluate time-dependent soil liquefaction probability based on CPT (Cone Penetration Test) data at the target site, including a case study in Yuanlin City in central Taiwan.
On the other hand, we also present a Monte Carlo Simulation to calculate the earthquake-induced soil liquefaction probability in Taiwan, based on the geological data and engineering seismological data in the literature. The analysis includes the probabilistic estimates considering input-data uncertainties and the randomness of earthquake occurrence.
In this probabilistic analysis, a total of 7 uncertainties were taken into account, including ground water level at the site (variable 1), the slip rate, and return period of two active faults (Chelungpu and Changhua fault) near the site, (variables 2-5), the error term of two empirical relationships (variables 6-7) used to estimate earthquake magnitude and PGA. | en_US |