| Summary: | 碩士 === 淡江大學 === 土木工程學系碩士班 === 100 === Soil liquefaction is a common type of ground failure, such as sand boiling, settlement and lateral spreading, during an earthquake. A case study of Sinhua site next to Yen-Shui River watershed, subject to liquefaction in the 2010 Taoyuan earthquake with magnitude of 6.4 (ML) in Taiwan, is performed. A method to construct the hazard-consistent fragility curves and hazard analysis for soil liquefaction by Monte Carlo simulation is proposed in this study. The uncertainties and variabilities of associated analysis parameters are all easily included. The earthquake magnitude (M) and the associated peak ground acceleration (PGA), i.e. the pair of seismic parameter of PGA and M, can be considered simultaneously for the evaluation of liquefaction. The analysis results of liquefaction potential and damages thus obtained are more reasonable. The hazard-consistent fragility curves and hazard analysis for soil liquefaction by Monte Carlo simulation are constructed using three damage indices, including liquefaction potential index, IL, liquefaction probability index, PW, and settlement after liquefaction, St. It can be concluded that non-plastic cohesionless soils under saturated condition are susceptible to liquefaction, especially for those sites where liquefaction had occurred in past earthquakes. Thus, the effects of soil liquefaction and associated hazards should be carefully analyzed and evaluated to prevent potential damages in engineering planning and design.
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