Study of Reinforcement Behavior for Geosynthetics Applying in Road Base Layer

[[abstract]]加勁土壤已廣泛地運用在各種大地工程上，如擋土牆、土堤、橋台與道路路基等。本研究利用可表現出現地土壤與加勁材間受力與變形行為之大型平面應變試驗儀器，來模擬道路路基土壤之加勁行為。本試驗採用台中港砂、三分石、紅土三種土壤材料，二種強度之PET地工格網以及一種地工織布，並以動態(往覆式)、靜態兩種不同的加戴方式來進行一系列之加勁土壤試驗。試驗中也加入應變計來量測地工格網的局部應變且與整體應變相互比較。最後討論不同的加勁土壤條件下之行為影響，並求得相關的模數值來提供往後數值模擬參考之用。由試驗結果得知在動、靜態試驗地工合成材的種類與放置位置都會明確地提高加勁土體之強度。[[abstract]]The reinforced soil has widely used on geotechnical engineering like walls, dams, abutments, and road base etc. This study used large-scale plane strain test device that can represent stress-strain behavior of soil and reinforcement in the field to simulate reinforced behavior of soil of road base. This test used three soil materials (sand of Taichung port, gravel, and laterite) ,two different strength PET geogrids and one of geotestile. Use two different loads static state and dynamic state (cyclic load) to proceed a series of reinforced soil tests. The tests also added to strain gauges to measure the local strain of geogrids and compared with global strain of geogrids. Finally, influences of the different factors of reinforced soil were discussed, and obtain modulus to supply numerical analysis in the future. The results shows that the strength of reinforced soil would be increased by types and reinforced depth of geosynthetics in dynamic or static tests.[[note]]碩