近年來全球暖化的氣候變遷造成極端水文事件頻仍,每遇颱風重創臺灣地區,大量土砂下移、淤積就會致生災害,由於這些土砂量體頗大且品質較差,砂石業者興趣不高且無法於短時間清疏,不僅影響復建工程的進程,就近堆置若處理不當更會成為下次災害的料源。本研究依日本現地處理工法(ISM)之概念,利用重量比法調配水泥與淤積土砂之拌合配比,探討臺東地區細粒料比例(S/A)、水泥比例(C/A)等對拌合體強度之影響。試驗得知就水泥比例(C/A)而言,拌合體強度與配比水泥用量有高度的相關性;就細粒料比例(S/A)而言,在水泥用量配比1:6及1:9時拌合體強度與細粒料比例(S/A)的線性相關性頗高,但隨著水泥用量的減少其相關性亦隨之下降;考慮工程使用之便利性,由水泥比例(C/A)、細粒料比例(S/A)、粗骨材比重及粗骨材磨損率比對歸納拌合體強度公式之相關性頗高,應可作為臺東地區現地拌合配比之調配基準。
In recent years, climate change caused by global warming has resulted in extreme hydrological events frequently. Whenever typhoons hit Taiwan, the siltation of a large number of sediments would cause disasters. Due to the considerable amount and poor quality of the sediments, the sand and aggregate industry is not highly interested in it, or it cannot be dredged in a short period of time. Hence, it has affected the process of the reconstruction project. If stacked nearby and not handled properly, the sediment will cause a disaster. According to the concept of Japan In-situ Method (ISM), this study applied the weight ratio method to determine the mixing ratio of cement and Taitung’s sediment deposition, and explore the impact of the proportion of sand and aggregate, silt content and cement amount on mixing strength. The results showed that in terms of sand-to-aggregate ratio, mixing strength distribution is more scattered and there is apparent gap in strength. In terms of cement amount and S/A ratio, mixing strength and cement amount are highly correlated. The correlation coefficients of cement amount, S/A ratio, Proportion, Aggregate wear rate, mixing strength are 0.7180. These factors can be the basis forTaitung area in situ mixing.