疏浚淤泥流动固化处理与流动性试验研究

疏浚淤泥由于含水率高、强度低、渗透性低等特性,在工程上难以直接利用而往往作废弃处理,造成了资源的浪费和土地的占用。针对我国疏浚施工的特点,基于传统固化方法,提出了将高含水率疏浚淤泥进行流动固化处理,并进行了流动性试验研究。结果表明,固化淤泥拌合物的流动值与初始含水率及固化材料掺量之间均具有良好的线性关系,初始含水率2.5wL是能否进行流动固化处理的临界值。基于影响流动性的两个重要因素,即初始含水率和固化材料掺量,提出了广义水灰比的概念,建立了流动值的预测方法,并对预测公式进行了验证。

Study of flow-solidification method and fluidity test of dredged clays

Because of high water content, low strength and low permeability, dredged clays could not be directly used as engineering materials. Dump-disposing for dredged clays always occupies a large scale of ground and these resources were wasted. Based on traditional solidification method, a new flow-solidification method is put forward which considering the current dredging method in China. And this method can deal with dredged clays with high water content efficiently. In order to study the fluidity of the treated mixtures, a series of laboratory fluidity tests have been performed. The experimental results show that both the initial water content and the adding quantity of solidification agent have good linear relationship with the fluidity of the mixtures. And there exists a critical value of the initial water content for flow-solidification; and the critical value is 2.5 times of the liquid limit. A concept of generalized water-cement ratio is defined; and a prediction method of fluidity is established based on initial water content and adding quantity of solidification agent. Finally, the validity of the proposed formula is verified.