本研究的目的為透過有限元素分析進行加勁基礎土壤的分析,首先以有限元素軟體PLAXIS進行實際案例驗證,由前人文獻提供材料參數及模型尺寸進行數值分析並進行比較,得到荷重與變形量的曲線結果接近且趨勢相同,藉此確認本研究以PLAXIS軟體進行加勁基礎土壤分析之適切性。接著進行一系列參數檢測,了解進行此等數值研究應考慮的數值模型參數因子,研究結果顯示底層厚度、基層的CBR值、地工合成材料的彈性軸向勁度、地工合成材料配置深度為加勁基礎土層的重要參數因子。隨後進行參數分析,討論網格疏密度、荷載模擬、地工合成材料種類及擺放位置以及介面折減係數等對基礎土壤加勁的地表沉陷量值之影響。
This goal of this research is to study the effect of geosynthetic material on reinforcing foundation soil. This research is implemented by conducting finite element analyses of soils layers. First, numerical models of foundation soil layers are built to simulate published cases. The numerical approach is validated by the promising comparison with the loads and deformations both concerning the trends and the magnitudes as reported on literatures. A series of parametric study of varying design parameters of the baseline numerical model are performed to identify that the thickness of base layer, CBR of Subgrade layer, elastic stiffness of geosynthetic material, and the placing depth of geosynthetic material, are important parameters for performing numerical analysis of geosynthetic reinforced foundation soil layers. More serious of parametric study are conducted to understanding how the ground settlement of reinforced foundation soil responds to the mesh size, loading pattern, material properties and placement location of reinforcement, and the coefficient between soil/geosyntheitc interface.