0206地震於台南市中西區、安南區、新市區、北區及永康區等多個行政區內引發大範圍土壤液化災害，造成台南地區有過千戶的民宅受損。在個別案例中，建物因土壤液化發生嚴重下陷與傾斜，造成周邊維生水管破裂，路面出現裂縫，甚至建物無法使用或居住。由於本次受災區域老舊住宅密集，為提供後續既有建物地盤補強或新建物評估基礎穩定性，有必要儘速進行災區之土壤液化潛勢評估，並提供可能液化土層深度與厚度分佈。
為建立災區的液化潛能分佈圖，本研究蒐集災區內的地質鑽探資料，先針對安南區受災區進行土壤液化潛勢評估，採用簡易經驗分析法中常用的NCEER修正之Seed法(2001)、Tokimatsu &Yoshimi法(1983)以及內政部(2011)「建築物耐震設計規範及解說」所建議之液化潛勢判定方法進行評估。依據比較分析結果，再選用我國耐震設計規範建議方法，分析其餘受災區內的鑽孔於各深度下之抗液化安全係數，透過Iwasaki深度加權法計算出各鑽孔的液化潛能指數，評估0206地震土壤液化災區的液化潛能分佈。本研究同時也針對土壤液化後沉陷量大於30 cm之嚴重災點區域，分析災點鄰近的液化層深度及厚度，提供後續的修繕或改善工程作為參考。另外，土壤液化造成災區出現不同嚴重程度的下陷，為評估災區的液化後下陷量，本研究以Tokimatsu & Seed(1987)評估法與紀雲曜(1997)的EPLS法進行安南區受災區的沉陷量分析，再用EPLS法分析其餘鑽孔，建立出災區的沉陷量潛勢圖，並且與實際沉陷量作比對。
分析成果顯示，以NCEER修正之Seed法與Tokimatsu & Yoshimi法分析所得的土壤液化潛能較我國耐震設計規範建議方法的分析結果低。以我國耐震設計規範建議方法所繪製的安南區受災區液化潛勢圖較能符合嚴重災點的分佈。各災區的液化潛能分佈圖大致上能良好相對災點的分佈位置，但中西區受災區的液化潛勢圖有部分災點位於低液化風險的範圍內，原因可能為部分分析採用之鑽孔深度不足20米所導致。比對受災區的沉陷量潛勢圖與實測值的，顯示新市區受災區的沉陷量分析成果與實測值最為吻合，其次為中西區受災區，而安南區受災區的沉陷量分析結果則有低估之情形。中西區受災區的可能土壤液化層分佈剖面圖顯示，嚴重災點鄰近的液化層深度範圍大約為2~8米；而安南區的土壤液化層分佈主要由西向東逐漸減少，與災點的分佈情形相同，災點集中的東側位置在深度20米也可能有液化層存在。由於分析所得之土壤液化層可能出現的區域乃住宅區，因多為老舊建物，因此後續應對可能存在土壤液化風險之區域進行地盤改良，如低壓灌漿工法，以避免後續土壤液化災害。

The 0206 Meinong Earthquake induced the disasters due to soil liquefaction in Tainan. The affected areas included West Central District, Annan District, Sinshih District, North District and Yongkang District. In some cases, excessive settlement and tilt of the buildings in the quake-stricken areas occurred. As the damaged constructions in the stricken areas of 0206 earthquake are old and intensive, it is necessary for evaluating the liquefaction potential of the disaster area and the distribution of the liquefied soil layers. Settlements are a common type of disasters in the 0206 earthquake, so the analysis of liquefaction settlement is essential to the future of the disaster mitigation planning. The study uses the simplified empirical methods which include Seed’s method revised by NCEER(2001), Tokimatsu & Yoshimi’s method(1983) and the method of the Seismic Design Specifications and Commentary of Buildings to evaluate the liquefaction potential of the stricken areas in Annan District. The rest are evaluated by the method of the Seismic Design Specifications and Commentary of Buildings. The distribution of the liquefied soil layers is determined by the liquefaction potential index. Tokimatsu & Seed’s method(1987) and EPLS are adopted for the analysis of liquefaction-induced settlement of the stricken areas in Annan District. The rest are evaluated by EPLS. The liquefaction potential maps of the stricken areas coincide with the distribution of the disaster points caused by soil liquefaction. The soils within 5 meters near the serious disaster points are loose sands. The values of the settlements evaluated by Tokimatsu & Seed’s method(1987) are lower than the EPLS’s.

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