本研究藉由縮小尺寸物理模型砂箱試驗，模擬加勁基礎於正斷層上之作用。試驗中採用6公分高之正斷層錯動量，60°錯動傾角，進行20公分厚、100公分長、20公分寬之加勁基礎試驗模擬，並於4種不同的分析參數包括加勁材鋪設位置、基礎厚度、加勁材勁度與加勁材鋪設層數，探討結構物在1g的環境下錯動過程中，土壤地表沉陷量、土壤地表角變量、加勁材應變量和加勁基礎底部土壓力變化。本研究使用數位影像分析來評估土壤地表沉陷量與加勁材應變量，而於地盤上盤處安裝土壓量測計以量測斷層錯動過程中結構基底土壓變化。研究結果顯示，有加勁之土壤基礎相較未加勁土壤將可以有效減緩剪裂帶對基礎地表的影響，防止剪力破裂面傳播至基礎地表並降低基礎地表角變量，而透過增加基礎厚度、加勁材鋪設勁度與加勁材鋪設層數，皆可獲得更小的基礎地表角變量。最後藉由案例統整結果顯示，在正斷層發生錯動後，基礎上部之加勁路堤結構可以透過基底加勁，達到耐震設計規範中「小震不壞、中震可修、大震不倒」的要求。

This research presents a series of reduced model tests on geosynthetic-reinforced soil (GRS) foundation across a normal fault. The performance of the GRS foundation subjected to differential settlement induced by fault offset was investigated. The experimental tests modeled a 20-cm thick, 100-cm long and 20-cm width foundation in sandbox model, subjected to a 6 cm of fault movement on a fault plane dipping 60°. The test variables include reinforcement layer, stiffness and location, and foundation thickness. Digital image analysis techniques were applied to determine the reinforcement tensile strain and the top surface settlement profile at various magnitudes of fault offset. Pressure cells were installed on the hanging wall to measure the change of the earth pressure as the fault offset developed.
The test results reveal that the inclusion of reinforcement can effectively reduce the angular distortion of the foundation by spreading out the differential settlement over a wider influential zone at the ground surface. The angular distortion decreased as the reinforcement layer and stiffness and the thickness of the reinforced foundation increased. By integrating the testing result from others papers, the GRS embankment with GRS foundation will follow the design guideline「No damage in light earthquake, no collapse in strong earthquake」when it subject to normal fault.

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