考虑深层渗滤效应的水泥浆动界面特征研究

 基于渗流连续性方程、Darcy定律及线性滤过定律，建立水泥浆动界面理论模型，分析深层渗滤效应下水泥浆界面的运移机制和封堵机制；应用自主研发的模型试验系统，研究浆液设计扩散距离及沉积层渗透系数的动态变化规律，并与理论值进行对比分析。结果表明，设计扩散距离取决于渗透系数设计上限和注浆参数；受深层渗滤效应的影响，沉积层渗透系数随水泥浆界面运移而动态变化。研究结论可指导注浆设计，对实际工程具有一定的应用价值。

Characteristics of moving interface of grout considering deep bed filtration

A theoretical model of the moving interface of grout was established on the basis of continuity equation of penetration，Darcy?s law and linear filtration law. The migration and plugging mechanism on the slurry interface was analyzed. The variation of designed spreading distance of grout and the permeability of the deposition layer were investigated using the model test system developed in-house. The experimental data were compared with the theoretical values. The results show that the designed spreading distance is dependent on the designed upper limit of coefficient of permeability and the grouting parameters. Influenced by the deep bed filtration effect，the coefficient of permeability of the deposition layer varies along the slurry interface migration.