复合膏浆渗透扩散的二维离散元模拟分析

针对现有注浆理论难以对岩土体中的浆液在空隙及裂隙通道网络中的真实扩散规律进行准确描述的问题,本文从连续性方程的角度出发,运用二维颗粒流程序(PFC2D)建立数值模型,模拟研究注浆压力、注浆时间及砂卵石层渗透系数对复合膏浆在砂卵石层渗透扩散过程中的扩散半径的影响,总结规律并利用非线性拟合得出各因素与复合膏浆渗透扩散半径间的关系式。结合现场注水试验及开挖结果,得到与模拟基本一致的结果,所得成果可为工程施工提供一定的理论支撑和指导。

Simulation analysis of two-dimensional discrete element of compound slurry diffusion

Aiming at the problem that the existing theory of grouting can''t accurately describe the real diffusion law of grout liquid in the network of gap and fissure way. From the view of continuity equation, this paper established a numerical model by use of PFC^2D, and studied the influence of grouting pressure,grouting time,permeability on grout diffusion radius in sandy pebble layer. It summarized the law and used non-linear fitting to obtain the relational expression between these factors and grout diffusion radius.Combining injection water test with dig result,it got the resulr which is consistent which that of simulation.The result can provide a theoretical support and conduction for the construction of engineering.