台灣於2022年所公布資料中總計317處垃圾掩埋場，121處掩埋場仍營運使用中，而196處屬停用、復育或封閉。除了營運中的垃圾掩埋場可能會發生外溢污染地下水環境和廢氣產生惡臭等，停止使用的掩埋場亦可能會環境產生不良的影響，故如何配置有效之阻隔是為掩埋場設置最重要一環。目前我國垃圾掩埋場配置僅使用單一種阻水層作為掩埋場襯層，為了提供其他具工程實務應用之配置方式，本研究參考國外使用回填材料於掩埋場阻水襯墊之分析結果，並依照我國所需設置規範進行相關可行性之完整力學試驗。除此之外，砂-膨潤土具有吸水膨脹特性、較低水力傳導係數和良好密封性等優點，因此常作為回填材料被使用於垃圾掩埋場。
本研究採用台南市安平地區海砂混合澳洲SIBELCO開採膨潤土作為回填材料進行基本物理性實驗，並嘗試使用善化地區善化糖廠之沃土作為穩定劑，探討未添加與添加穩定劑對回填材料的力學特性與長期穩定及安全性。一系列的力學試驗包含標準夯實試驗、無圍壓縮試驗、壓密試驗、自由回脹試驗及三維體積收縮試驗，檢視穩定劑添加於回填材料之力學行為，並選出最佳之穩定劑添加配比於回填材料。
根據試驗結果顯示，兩種不同膨潤土重量比例混合海砂之砂-膨潤土(SB10及SB15)不論是添加4%、8%或 12%的沃土(PM)穩定劑都能夠有效提升其力學行為。除了能夠有效提高回填材料的剪力強度外，沃土穩定劑的添加還有助於提升試體在受剪過程中的延展性，且在體積變化下所造成的影響非常小，得防止膨脹趨勢，降低膨脹潛能與提高收縮限度。兩種不同砂-膨潤土回填材料在12%穩定劑添加量下改善效果較佳。由XRF化學分析表分析顯示，沃土含有有機物質CaCO3，CaCO3與水接觸後會產生鈣離子，除了提供填料效應，也會加速與無定形二氧化矽化合物進行火山灰反應，從而提供更多的水化產物(C-S-H)，並使試體更緊密與壓實。此外，沃土成分中含有纖維，使其在受剪階段可提高黏土顆粒與纖維之間相互作用和聯鎖機制，在應力-應變行為下變得更具延展性。最後，添加成效隨著穩定劑含量增加而上升，惟其可能存在極限值，未來仍需要更多的實驗去驗證。

In landfills, spills often occur, polluting the groundwater environment, and creating foul odors, seriously affecting the environment. Considering the above, how to constrain the contaminants spills into the groundwater system is the most important part of landfill. Therefore, a reference to the results of overseas analysis of the water-stop lining was made. Their engineered liners contain a buffer material that is typically a carefully measured blend of bentonite and pure sand. Further, to study the influences of press mud (PM) obtained from a sugar factory in Shanhua District, Tainan, on the engineering behavior of sand-bentonite, the mechanical properties of sand bentonite mixtures with 10% and 15% bentonite contents were investigated in the laboratory. In addition, various PM contents were used as an additive to stabilize, the sand-bentonite mixtures. The Laboratory tests include compaction tests, unconfined compressive tests, one-dimensional consolidation tests, free swelling and shrinkage tests leading to the PM content that best stabilized the sand-bentonite mixtures. The results of this experimental investigation indicate that adding PM increased the unconfined compressive strength of sand-bentonite mixtures with an increase in curing time and additive contents, and the addition of the stabilizer also helped to increase the ductility, while the sand-bentonite volume change decreasing with increasing PM contents. Based on the reasonable laboratory test results, it can be noted that the sand-bentonite mixtures can be successfully stabilized with PM.

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