高含水率疏浚淤泥自然沉积规律试验研究
首发时间:2009-06-04
摘要:在航道疏竣和近海岸开发过程中,产生了大量疏竣淤泥,目前大多采用外海抛淤或者堆场贮存的方法处理该疏竣淤泥。由于吹填淤泥性质复杂,堆场贮存的淤泥需要很长时间进行自然沉积固结,影响贮存堆场的运营和淤泥的再生利用。本文以福州可门港港池疏竣淤泥为主要研究对象,通过泥浆的室内自然沉积试验,研究疏竣淤泥在静水条件下沉积规律以及沉积过程中淤泥含水率的变化规律,探讨海水和淡水两种沉积环境(盐分变化)以及初始含水率等初始参数对沉积速率和沉降量的影响。试验结果表明泥浆沉积模式为等速沉积-过渡区-慢速沉积,采用双曲线的方法进行拟合后,发现疏竣淤泥的自重沉积过程与一般土体的固结过程相似。为此,疏竣淤泥沉积分析可以采用固结模式进行分析,并可采用双曲线等方法进行沉降量预测。
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Sediment Behavior of Dredged Slurry with High Water Content
Abstract:Presently, the drudged slurry with high water content is disposed by rejection in the ocean or storage at the cofferdam which is produced hugely during the channel dredging and harbor construction. Long periods are needed during the storage at the cofferdam for the complexity of dredged slurry, which will affect the operation of cofferdams and reuse of the dredged slurry. In the paper, the dredged clay from Kemen port, Fuzhou is used to analyze the sedimentary behavior at the initial condition of different water content, and salinity by the lab sediment experiments. The results show that the sediment model can be separated to three parts: quick settlement-transition- slow settlement. The sedimentary curve is of hyperbola, and is similar with that of the consolidation progress of natural clays. Hence the consolidation method can be adopted to analyze the sedimentary and hyperbola curve can be used to predict the settlement.
Keywords: high water content natural sediment initial water content sediment behavior
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