吹填泥浆沉降特性的室内试验研究

Indoor Experimental Study on the Coagulation-Sedimentation Properties of Hydraulic-Dredged Mud

为解决吹填泥浆自身沉降时间较长、吹填土地基固结速度较慢等问题,以温州平阳地区泥浆为研究对象,在初始含水率为500%的吹填泥浆中分别加入聚合氯化铝(PAC)、硅酸钠(Na_2SiO_3)、硅酸钠和硅藻土复合试剂,利用搅拌静置沉淀的方法观察泥浆混合液泥水界面高度特性。试验结果表明,泥浆中加入外加试剂与否对泥浆的沉降速度具有明显的影响,且加入混合试剂比加入单一试剂的效果更明显。对比试验结果得知,以质量浓度为5g/L的硅藻土与15g/L的Na_2SiO_3的组合混凝剂的作用效果最明显,不仅泥浆的沉降速率最快,且最终沉降性能最好。

In view of the flaws of long-delayed settling time of the dredger filling mud and slow consolidation speed of the dredged soil foundation,a research has been carried out,with the slurry in Pingyang area,Wenzhou as the object of study.With the addition of polyaluminum chloride(PAC),sodium silicate(Na2SiO3),sodium silicate(Na2SiO3)and diatomite composite reagent to the dredger mud with initial water content of 500%,an observation can be made of the height characteristics of mud water interface by adopting mixing static precipitation method.The test results show that the addition of applied reagents in the mud exerts an obvious effect on the sedimentation rate of the mud,with the positive effect of adding mixed reagent more obvious than that by adding single reagent.The results of contrast tests show that the positive effect of the combined coagulant with the mass concentration of 5 g/L and diatomite 15 g/L proves to be the most obvious with the fastest sedimentation rate and the best final settlement performance of the hydraulicdredged mud.