多孔介质中悬浮质的淤塞作用对悬浮液渗流动态的影响

On colmatage of suspensoid and its influence upon flowing states of suspensions in porous media

定量地预测悬浮质在导水介质里流动过程中的淤塞作用及其对浆液流动动态的影响有助于合理地设计注浆工艺和控制注浆过程。表述悬浮质在多孔介质中的淤塞作用及其对流动状态的影响的数学模型由三个微分方程组成 ,即 :悬浮质运移方程、悬浮质沉淀动态方程和悬浮液流动方程。用有限差分法对定流量和定边界水位差二种条件下多孔介质中一维流悬浮质淤塞问题的求解结果证明 :由于淤塞作用 ,悬浮液在多孔介质中的流动总是呈非稳定流 ,并且随着时间的变化 ,在定流量条件下 ,流场中水力梯度逐渐增大 ;在定边界水位差条件下 。

A correct quantitative estimation of the influence of suspensoid colmatage upon the seeping progress of suspensions in the m edia is helpful for the reasonable designation of injection technolgy and for controlling the injecting process. The mathematical model describing the colmatage and its influence on seeping behavior of suspensions consists of the three differential equations presented in this paper:transportation equation of suspensoids,kinetic sedim entation equation of suspensoids and flow equation of suspension.The theoretical solution of one- dim ensional model for suspensions flowing in porous media resulted by finite difference method respectively at constant flow discharge and constant boundary pressure difference demonstrated thatdue to colmatage the flowing state of suspensions is always unsteady,and with the change of seeping time the hydraulic gradient increases gradually at constant discharge conditions or the discharge rate decreases gradually at constant boundary pressure difference conditions in the flow field.