集集地震過後，已有許多學術界或工程界的專家學者針對員林地區的土壤液化現象作了相關的調查、研究及分析工作。不過多為利用目前土木工程界所熟悉的簡易土壤液化潛能評估法、土壤液化潛能指數分析法及簡易震陷量評估法，來對員林地區的土壤特性作相關研究，而還沒有一個對當地地震災後復舊情況的完整調查。故本研究即欲對員林地區震災後的復舊狀況建立一完整的災後復舊調查，以應用於未來的液化災損評估上。 本研究首先對員林地區進行簡易之液化潛能評估，包括了液化潛能指數及震陷量之分區，再以問卷進行現地訪談的方式，瞭解員林地區之災害復舊狀況，並利用地理資訊系統的科技來展現員林地區所有災損點調查結果及液化分析結果。 土壤液化分析結果顯示，員林地區的東區及南區屬於液化潛能較高的區域；而除了應用工程界最常應用的Iwasaki液化潛能指數來評斷液化潛能之外，另外還需考量液化層與非液化覆土層厚度的關係，這樣在設計上才較能符合現場狀況，較不容易產生高估或是過於保守的情形。復舊調查結果顯示，重量越重的建物，在遭受到液化災害時所產生的沉陷量也會越大，建物損害的狀況則受基礎型式影響。在復舊工作的花費上，若復舊方式僅修整地坪，花費最多不超過50萬，若進行建物扶正或補強，花費多大於50萬，且視工法的不同而有所所不同。 After the Chi-Chi earthquake, the extent of liquefied area and the associated damages in Yuan-Lin have been investigated and analyzed by many local experts. Most of them adopted the different simplified method of soil liquefaction assessments (i.e., SPT-N values or CPT-qc values) to evaluate the liquefaction potential, however, a complete investigation on the remediation of damaged buildings in Yuan-Lin was still scarce. In this study, A comparison of the results from the liquefaction analysis and the survey of the remediation of damaged buildings caused by liquefaction in Yuan-Lin were performed. The contours of liquefaction potential index and the post-earthquake settlements in Yuan-Lin were established, and then using both field reconnaissance and a questionnaire survey the local resident on the state of related remediation of damaged buildings in Yuan-Lin. Finally a Geographic Information System is adopted to display the results of the liquefaction analysis and the remediation states. The analytical results show that eastern and southern parts of Yuan-Lin have the higher liquefaction potential. The relationship of the thickness of unliquefable surface layer and the thickness of liquefiable layer should be considered. The heavier the building is the more subsidence will occur. The survey shows that the expenses are less five hundred thousand dollars if the remediation works are limited to re-finishing the first floor slab.
