英文篇名
Engineering Properties of Soft Ground Condition of Yilan Area
作者
趙紹錚、黃宏謀
關鍵字
宜蘭、軟弱地盤、大地工程分區、液化潛能
摘要
宜蘭地區(蘭陽平原)地質多為含有細顆粒含量高的軟弱土壤,加上地下水位面非常接近地表,於交通道路工程及建築結構物興建時,屢遭遇到承載力不足及沉陷量過大的問題。例如國工局進行之北宜高速公路平原段側車道工程,公路總局興建之台9線宜蘭市外環道路,及目前大量建造於蘭陽平原極軟弱土壤上之各類建築物等,隨著結構物量體之增加,軟弱地盤相關工程問題無法避免。由於軟弱地盤可概分為軟弱土壤與易液化土壤兩種特性,本文藉由介紹蘭陽平原地體構造土層厚度、宜蘭縣大地工程分區、蘭陽平原土層整體特性、及土壤液化初步分析等課題,說明宜蘭地區近年來與軟弱地盤工程特性有關之研究成果,提供大地工程界先進規劃設計施工時相關參考資訊。
英文摘要
The soft Yilan soils consist of high proportion of fine grained particles with high ground water table conditions. Therefore, bearing capacities and excessive settlements of the road projects and building structures result in many practical problems during construction work. For example, the expressway project of the Yilan Plain section of the Taipei-Yilan express by the Taiwan Area National Expressway Engineering Bureau, the Route 9 Yilan City outer-ring expressway project by the Directorate General of Highways, and those contemporary structures constructed on the extremely soft Yilan soils, all of them have no way to avoid dealing with the inadequate bearing capacities and the excessive settlements problems with the structure’s dimension increasing. Soft ground can be generally classified into two categories, namely soft soil and liquefaction susceptible soil. Thus, this paper presents the recent research results of soft ground condition of Yilan area by means of explaining the subsurface layer structure, the geotechnical engineering zones, the integral soil characteristics, and the liquefaction potential. It is hopeful that the state-of-the-art research findings can be used by geotechnical engineers in planning, designing, and construction phases.