台灣中部現地土壤液化成因與損害防治對策研究

Study of Cause and Hazard Mitigation of Liquefaction Sites in Central Taiwan

辜珮琳(Pei-Lin Gu)

指導教授 ： 張子修

朝陽科技大學/理工學院/營建工程系/碩士(2014年)

摘要

地震之各項災害中，土壤液化是其中一項主因，並受到國內外學者投入液化機制之研究與防治。921集集大地震發生液化現象最嚴重的地方，包括臺中市霧峰區、彰化縣員林鎮、及南投縣南投市等地，液化的範圍均大於4平方公里。
本研究收集臺灣中部地區液化災害案例，其液化層中值粒徑D50約在0.07~0.2 mm，細料含量(細砂、粉土)約在5.5%~57%，皆與目前的研究結果大致相符。一般基礎地層產生液化造成建物破壞之型態，視其地層條件、結構物荷重狀況與基礎型式而異，其中構造物基礎以樁基礎之抗液化效果較佳，筏式基礎及連樑基礎次之，獨立基腳或條狀基腳最差。而防制液化的工法甚多，如何選擇最適合之工法，應在施工前進行鑽探調查，以了解不同工址之液化潛能及基礎潛在問題。

關鍵字

液化防治工法 ； 液化 ； 921大地震

並列摘要

In earthquake disaster, the soil liquefaction is one of the main reason for damages, and liquefaction mechanism of investment in research and prevention were main topics by scholars. The 921 earthquake liquefaction worst damage places include Wufeng District, Taichung City, Yuanlin, Changhua County, Nantou County and other places, where liquefied areas range greater than 4 square kilometers.
This study collected liquefaction hazard cases in central Taiwan, and study found the median grain size D50 in liquefied layer is about 0.07 ~ 0.2 mm, fines content (sand, silt) about 5.5% ~ 57%, and the current findings are rougly match with previous study results. General building base formation patterns caused buildings to destruction, depending on the conditions of their formation, structure and foundation type load conditions, in which foundation constructed with pile foundation performed the best, raft foundation with coupling beam followed, as the second, and independent footings or strip footings the worst in resisting liquefaction. For prevention of liquefaction damage, many engineering methods have been development and introduced as how to choose the most suitable method of work, which should be carried out before construction subsurface survey and to understand the basis of liquefaction potential and the potential problems at different construction sites.

並列關鍵字

liquefaction mitigation ； liquefaction ； 921 earthquake

參考文獻

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