大村地區液化潛能分析

民國88年9月21日凌晨1點47分於南投縣集集鎮附近發生芮氏規模達7.3之強烈地震，在台灣中部地區內發生明顯的土壤液化現象，對於一般民宅、公共結構物、與維生管線造成極為嚴重的傷害。本研究選取大村地區3處位置進行鑽探SPT試驗與取樣，並操作土壤之一般物理試驗。結果顯示土層多為飽和砂性土壤厚層，BH-1鑽孔細料含量在10%~46%之間，BH-2鑽孔之細料含量為8%~32%之間，BH-3鑽孔細料含量則在6%~32%之間。依據物理試驗之結果，採用Seed簡易經驗法（簡稱Seed法）與Tokimatsu and Yoshimi液化評估法（簡稱T&Y法）進行液化潛能分析，結果顯示Seed法較T&Y法為保守，BH-1鑽孔附近之液化潛能屬中度（Seed法）至無（T&Y法）液化區，BH-2與BH-3鑽孔附近之液化潛能屬嚴重（Seed法）至輕微（T&Y法）液化區。

關鍵字

土壤液化；細料含量； SPT-N值

並列摘要

On September 21 1999, the Chi-Chi earthquake with a magnitude of 7.3 hit Taiwan. Soil liquefaction and ground settlement caused great damages on buildings, bridges, and life lines in central Taiwan area. This research selected 3 sites located in the major liquefaction areas of Dat-Suen to investigate the mechanism of soil liquefaction in this earthquake. Soil specimens were tested to get their physical properties. Results show that soil layers near these 3 bore holes (BH-1, BH-2, BH-3) are thick saturated sandy layers. The fines content is 10% to 46% at BH-1, 8% to 32% at BH-2, and 6% to 32% at BH-3. The Seed method and Tokimatsu and Yoshimi method (T&M method) were adopted to evaluate soil liquefaction potential in these two areas. Results show that the Seed method is more conservative than T&M method. The soil liquefaction potentials near selected sites are slight to none for BH-1 and are heavy to slight for BH-2 and BH-3.

並列關鍵字

soil liquefaction ； fines content ； SPT-N values

國際替代計量

大村地區液化潛能分析

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