| 摘要(英) |
The impact on soil liquefaction potential primarily depends on two major factors, in this study calls geological factors and geotechnical factors. Geological factors mainly include seismic magnitude and peak ground acceleration (PGA); geotechnical factors mainly involve soil composition and strength.
However, both of these factors are subject to uncertainty. For example, in geological factors, uncertainties in PGA arise from uncertainties in the attenuation of ground motion, leading to disparities between estimated and observed values. In geotechnical factors, the N-value of the standard penetration test can differ from its true value due to mechanical failures, operational errors, and other factors. Additionally, variations of parameters in soil liquefaction assessment methods result in varying degrees of impact on the assessment results.
This study conducts a variance-based sensitivity analysis [1] to quantify geological or geotechnical uncertainties on the result of liquefaction analysis. It utilizes real soil and fault data from Taipei and Kaohsiung regions, using Monte Carlo simulation (MCS) to compute the variance of liquefaction safety factors. The sensitivity of each parameter is calculated to identify the most important parameters in the liquefaction assessment method.
This study found that uncertainties in geological factors have a greater impact on the results of soil liquefaction assessment. Upon further subdivision of the two factors into individual parameters, results show that the uncertainty in the estimated PGA has the greatest impact on the soil liquefaction assessment. This suggests that if geological uncertainties cannot be reduced, significant uncertainties will be present in liquefaction assessment results. |
| 參考文獻 |
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