英文篇名
EVALUATION OF THE STATE-OF-THE-ART DESIGN AND ANALYTICAL APPROACHES FOR GEOSYNTHETIC-REIN-FORCED SOIL WALLS(GRSW)
作者
周南山
摘要
加勁式擋土牆之發展,可謂近廿年來土木工程中進展最為迅速的部份之一。不但學理上已漸趨成熟,實際應用上更是一日千里,加勁材料幾乎每月皆有新產品問世,尤以地工合成物加勁材料為最繽紛眩目、五光十色,令人目不接暇。台灣近年來由於建設多朝向山坡地發展,擋土牆日益增高,使得傳統式鋼筋混凝土牆甚難與地工合成物加勁擋土牆抗衡。地工合成物加勁牆(Geosynthetic Reinforced Soil Walls,簡稱GRSW)一般可分為地工織布與不織布(Geotextile)及地工格網(Geogrid)牆二類。又加勁陡坡(Steep Reinforced Slopes)與加勁擋土牆極為類似,只是牆面非垂直而已。本文所謂加勁牆,乃取其較廣義之解釋,將「加勁陡坡」亦涵蓋在內。本文首先介紹地工合成物加勁擋土牆與傳統RC牆之比較,俾設計者在規劃階段可針對需要做一抉擇。其次,將介紹最新分析理論(State-of-the-art Analysis),並就各種極限平衡設計方法之原理與優缺點做一評估。最後,並探討有限元素法於加勁擋土牆之應用。
英文摘要
The analytical and design approaches for GRSW can be classified into two categories, namely, the limit equilibrium and the finite element methods. The limit equilibrium methods are typically based on relatively simple assumptions than on supporting empiricism, which result in diverse solutions among the various methods. The more prominent differences are probably due to significant disparity in defining allowable reinforcement strength and safety factors. The FEM methods, although too complicated for routine design, have demonstrated the ability in studying the behavior of GRSW. The results of FEM analyses, using DACSAR, to investigate the various factors affecting the performance of GRSW are presented. A design approach based on allowable deformation and tensile strain in the reinforcement is also developed.