台灣為一海島型國家，因地理位置緣故，港口發展迅速，而港口之興建伴隨著港口淤泥堆積、周圍海岸線後退、海灘消失等問題，故港口疏浚作業及港口周圍實行養灘是為環境永續的重大課題。本研究以雲林麥寮區之麥寮港為例，利用麥寮港之疏浚泥沙添加轉爐石(Slag)作為更抗侵蝕、抗剪動之回填材料，轉爐石是為煉鋼工業之副產物，其具有高抗剪強度、比重大之特性。研究內容為將麥寮砂(Mai-Liao Sand, MLS)與轉爐石以不同配比均勻混合，以顆粒組構觀點計算土壤之孔隙參數，並以水中沉降法(Water pluviation)準備試體，利用壓密排水單剪試驗探討不同轉爐石配比對原有疏浚泥沙之物理與力學性質之影響；再以改良效果最佳之配比用層狀鋪灑轉爐石方式準備試體，探討均勻混合與層狀堆積之抗剪強度差異。其結果能驗證轉爐石作為混合改良回填材料之可行性，並提供一量化結果作為實際施作之參考。

Taiwan is an island-type country. Due to its geographical location, the port is developing rapidly. The construction of the port is accompanied by problems such as silt accumulation in the port, the retreat of the surrounding coastline, and disappearance of the beach. Therefore, the dredging operation of the port and sand fill works around the port are environmental sustainability issues. This study uses the dredged sediment from the Mai-Liao harbor to add the BOF slag as a more anti-erosion and shear-resistant backfill material. The BOF slag is the by-product of the steelmaking industry, which has a high shear resistance and specific. The research content is to uniformly mix the Mai-Liao Sand (MLS) and the BOF slag in different ratios, calculate the pore parameters of the soil from the viewpoint of particle structure and prepare the specimen by water pluviation. We use consolidation drainage simple shear test to investigate the influence of different BOF slag content on the physical and mechanical properties of the dredged sediment form Mai-Liao harbor. And we prepare the specimen by layering the BOF slag method to investigate the difference in shear resistance between uniformly mix method and layered method. The results verify the feasibility of the BOF slag as a hybrid modified backfill material and provide a quantitative result as a reference for field application.

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