基于真空联合水平电渗法的水力冲挖淤泥脱水量计算方法

Dehydration quantity calculation method of hydraulic dredged silt based on joint vacuum and horizontal electroosmosis method

以阜阳市城区水系水力冲挖淤泥为研究对象,通过模型试验采集了疏浚淤泥在真空、水平电渗、真空联合水平电渗这3种作用下的脱水量,分析这3种作用下淤泥脱水量间关系,提出基于真空联合水平电渗法的水力冲挖淤泥脱水量计算方法。结果表明:真空作用下,淤泥的脱水过程可分为主要排出液态水的快速脱水阶段和主要排出气态水的稳定促排阶段,液态水和气态水的质量比约为3∶5;水平电渗作用下,水力冲挖淤泥的脱水速率与电流强度呈线性关系,淤泥的电导率与含水量呈线性、指数或二次函数关系,其中基于线性关系拟合得到的电渗脱水量与实测值吻合最好;基于真空联合水平电渗脱水法的水力冲挖淤泥脱水量可通过叠加真空和水平电渗作用下脱水量进行综合计算。

Taking the dewatering treatment method of hydraulic dredged silt in the river system of Fuyang urban area as a research object,through model test and theoretical analysis,the water yield in the dewatering process was collected,and the relationship among the vacuum dewatering method,horizontal electroosmosis method and joint vacuum and horizontal electroosmosis method was analyzed.The dehydration quantity calculation of hydraulic dredged silt based on joint vacuum and horizontal electroosmosis method was proposed.The results show that,under the action of vacuum dewatering method,the dewatering process of hydraulic dredged silt can be divided into two stages,rapid dewatering and stable drainage,in which the mass ratio between liquid water and vaporous water is about 3∶5.Under the action of horizontal electroosmosis,the dewatering rate of hydraulic dredged silt has a linear relation with the current intensity and the silt conductivity has a linear,exponential or quadratic relationship with water content,of which the linear relationship is the best fitting.The dewatering amount of hydraulic dredged silt by joint vacuum and horizontal electroosmosis dewatering method can be comprehensively calculated by superposition of vacuum and horizontal electroosmosis dewatering amounts.