地球物理探測在土壤液化區之研究

2016年2月6日的美濃地震引起臺南市部分地區發生震災，結構物發生倒塌與破壞，發生嚴重土壤液化災情，土壤液化造成多處民宅沉陷、傾斜及地下維生管線損害，建築物與路面間的差異沉陷常是造成液化區域地下管線破壞的主因，油管、瓦斯管或其他工業管線，有時會產生嚴重二次災害。本文利用地球物理探測常用的地電阻影像法及表面波頻散法，在災後分別於二處場址進行現地調查研究，成果顯示地下水、砂、泥層分佈及地層剪力波速，並可以作為快速災損調查或較大區域液化潛勢評估狀況。

關鍵字

土壤液化；管線；地電阻；表面波頻散

並列摘要

The Meinong Earthquake left several structure failures and severe geotechnical disasters in the Tainan area in southern Taiwan on February 16, 2016. Amongst these disaster events, liquefaction caused residence settlement and tilt and also damaged underground critical infrastructures, such as water supply, electricity, telecommunication, sewerage, and industrial facilities. The failures on underground pipelines were highly associated with differential settlement between buildings and access roads on the liquefaction zones. Moreover, leaking oil, gas, and other chemical transport pipelines sometimes could result in disastrous secondary hazards in life and property. In this paper, two commonly-used geophysical inspection methods, including resistivity imaging and multi-channel analysis of surface wave (MASW), were applied to on-site investigation on two post-liquefaction zones. The spatial distributions related to geological characterization, groundwater, and shear wave velocity could be effectively identified by using these two geophysical inspection methods. In future, one could use this technique to rapidly investigate post-damage conditions or in advance evaluate the liquefaction potential over a large region.

並列關鍵字

Liquefaction ； Pipeline ； Resistivity Imaging ； Multi-channel Analysis of Surface Wave (MASW)

國際替代計量

地球物理探測在土壤液化區之研究

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