以數值方法進行地工格網加勁道路之力學分析; Application of Numerical Method to the Reinforcing Mechanism of Geogrid-Reinforced Roadways

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題名:	以數值方法進行地工格網加勁道路之力學分析;Application of Numerical Method to the Reinforcing Mechanism of Geogrid-Reinforced Roadways
作者:	黃文昭
貢獻者:	土木工程學系
關鍵詞:	地工格網;數值分析;離散元素法;介面元素;加勁道路;geogrid reinforcement;numerical method;Discrete Element Method (DEM);interface element;reinforced roadways;土木水利工程類
日期:	2010-08-01
上傳時間:	2011-07-11 15:53:10 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	對美國中西部地區而言，冰積土層 (glacial deposit)是通常會在道路建設的過程中遭遇到的軟弱黏土層。當路基級配層 (granular base layer)鋪設於此類黏土層之上時，可能會因為黏土層之承載力不足而導致產生過量之永久變形。目前在台灣道路建設，一般地工加勁材的運用範圍為擋土牆，另一部分為使用地工格網做為加勁道路之材料。近年來美國使用地工格網於道路工程的計畫與研究有成長的趨勢，同時由施工後的表現看來，地工格網加勁道路的確也能改善道路之表現，同時級配層之厚度也得以減少。作為道路加勁之材料，因為地工格網扮演了提供力學機制上的束制行為，因此也提高了軟弱黏土層之承載力，進而減少了道路本身因交通加載產生之垂直及側向變形量。本研究主要著重於運用數值方法 (主要為離散元素法, Discrete Element Method)，在道路加勁方面，針對級配層顆粒進行介面顆粒力學機制之研究。由於級配層之顆粒級配狀況對於地工格網之加勁效果，及軟弱黏土層承載力之變化有一定的影響，因此在本研究之中，會以級配層之級配狀況做為分析的參數之一，並且以級配相關參數做其變數。 When weak or soft subgrade was encountered in roadway construction, the usual approaches to deal with such type of soil are excavation and replacement, chemical treatment method or geosynthetic reinforcement. Without proper approaches to improve the soft subgrade, excessive deformation of the roadway system might be occurred and hence cannot meet the design expectation. Due to the fact that the geogrid reinforcement provides additional confinement to the system, it is likely that subgrade bearing capacity could be improved, resulting in reduced vertical and horizontal deformation on the surface of the roadway system. Based on previous study performed by the author, it was concluded that the geogrid reinforcement can enhance the shear strength of the subgrade layer (based on the reduction of yielding zone in the subgrade layer), however, geogrid reinforcement also provides reinforcing mechanisms such as lateral restraint, and dynamic interlocking to the granular base layer. This project focuses on the microscopic point of view of the interface elements between the granular base layer and the geogrid reinforcement using Discrete Element Method (DEM). It is of our interest to understand, under different particle size distributions of the granular base material, the reinforcing mechanism provided by the geogrid reinforcement. It is also expected to quantify the improvement of the granular base layer through the concept of equivalent stiffness of the granular base material. 研究期間：9908 ~ 10007
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
顯示於類別:	[土木工程學系 ] 研究計畫

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