粉土液化潛能與液化後體積應變量評估方法修正建議

2016年2月6日台灣南部發生芮氏規模6.6的美濃－台南地震，造成台南市多處地區土壤液化災害，引發了工程界對土壤液化課題的熱烈討論，本文作者早於2010年高雄甲仙地震後，即針對當時也發生土壤液化災害的台南新化地區進行長達5年的的粉土液化試驗與分析，完整研究台灣西南部沖積平原低塑性粉土的相關動力特性與土壤液化潛能。研究以高品質原狀與重模粉土試體進行土壤動力試驗，探討影響粉土液化潛能與液化後體積應變量的因子，研究成果顯示，現行土壤液化潛能與液化後體積應變量評估方法應用於粉土液化潛能與體積應變量的判釋仍有改進空間。本文內容主要彙整相關試驗與分析結果，並提出粉土液化潛能與體積應變量評估方法修正方向，以及案例驗證，研究成果期望提供工程界未來從事粉土液化防治設計與施工參考。

關鍵字

土壤液化；液化後體積應變量；粉土液化；擾動影響

並列摘要

On February 6th of 2016, a magnitude 6.6 earthquake hit Mei-Nong, Taiwan. This earthquake had induced sever liquefaction damages to many areas in Tainan City and had raised engineers' attention to soil liquefaction. In 2010, a similar earthquake occurred in Jia-Shan, Kaohsiung and had caused soil liquefaction in Hsin Hwa area, Tainan. The authors had conducted series of soil testing and a five-year long study on dynamic properties and liquefaction potential of non-plastic silty sand. High quality undisturbed soil samples and remolded ones were used to conduct dynamic soil tests to investigate influence factors on silty sand liquefaction potential and post-liquefaction volumetric strain. Result of this study indicates that there are still needs in improvement on present evaluation methods of soil liquefaction potential and post-liquefaction volumetric strain for non-plastic silty sand. In this paper, test and analysis results will be summarized first. Modifications to evaluation methods of silty sand liquefaction and post-liquefaction volumetric strain will then be proposed with case verifications. Progress of this study is hoped to provide references to engineers conducing design and construction of liquefaction mitigation works.

並列關鍵字

soil liquefaction ； post-liquefaction volumetric strain ； silty sand liquefaction ； disturbance effect

國際替代計量

粉土液化潛能與液化後體積應變量評估方法修正建議

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