扰动淤泥与沉积淤泥的流变特性研究

为了分析不同沉积状态的淤泥流变特性，本文将淤泥作为线性粘弹性体，提出了根据泥水系统控制方程解答和波浪在泥床上传播时的实测变化规律求取淤泥流变参数的反分析方法，并利用遗传算法分别求解搅匀(扰动)与自然沉积淤泥的流变参数.结果表明，淤泥平均密度相同时，自然沉积淤泥的弹性模量明显大于人工搅匀淤泥的弹性模量，两者的粘性系数随淤泥密度的变化规律也有明显区别，这主要是由于沉积淤泥与搅匀淤泥的内部结构不同所造成的.

Reological properties of man-mixed mud and natural deposited mud

The mud is taken as a linear viscoelastic medium and an inverse analysis method for determination of the reological parameters is presented. The method is based on the solution of governing equations of mud-water system and experimental data of wave transformation over the mud bed. The rheological parameters are solved by means of genetic algorithms. It is found that the shear modulus and viscosity of natural deposited mud are remarkably different from those of man-mixed mud. The difference of internal structure in mud is the main cause of the difference of rheological properties.