流变参数时变性幂律型水泥浆液的柱形渗透注浆机制研究

 幂律型水泥浆液的流变参数时变性特征对注浆效果具有非常重要的影响。采用理论分析与实验研究等方法，研究了时变性幂律型水泥浆液的流变方程与渗流运动方程，推导了流变参数时变性幂律型水泥浆液的柱形渗透注浆扩散机制，分析了其适用范围及参数的确定方法，探讨了注浆管侧面注浆孔的设计依据。通过设计注浆试验对其进行了验证，结果表明：实际测量计算的幂律型水泥浆液在被注砾(砂)石体中的等效横向扩散半径值与由流变参数时变性幂律型水泥浆液的柱形渗透注浆扩散机制公式计算出的扩散半径理论值间虽有20%-30%范围内的差异，然它们都处于可接受的范围内；因此，能较好地说明幂律型水泥浆液在被注材料中随时间变化的柱形渗透注浆特征与规律。由于目前国际国内对流变参数时变性幂律型流体的柱形渗透注浆机制的研究还鲜有相关的文献报道，因此，本文研究成果可为实际注浆施工提供理论支撑与指导作用。

STUDY ON COLUMN PENETRATION GROUITNG MECHANISM BASED ON POWER-LAW CEMENT GROUTS OF TIME-DEPENDENT BEHAVIOR OF RHEOLOGICAL PARAMETERS

The rheological parameters of Power-law cement grouts are time-dependent，which have an important influence on grouting effects of practical projects. Carrying out theoretical analysis and experimental researches，the rheological equation and seepage motion equation for power-law cement grouts of time-dependent behavior of rheological parameters were established，then column penetration grouting mechanism about them were deduced. At the same time the scope of application，method to determine the parameters and design basis of the side grouting hole in the grouting pipe were analyzed respectively. Then they were validated by means of designing indoor grouting experiments. Experiment results show that equivalent transverse diffusion radius of actual measurement values in the indoor grouting experiments have about 20%-30% differences with that of theoretical values calculated by column penetration grouting mechanism based on Power-law cement grouts of time-dependent behavior of rheological parameters，but they are all within the acceptable error limits. Because the international and domestic researches on column penetration grouting mechanism based on Power-law cement grouts of time-dependent behavior of rheological parameters were seldom reported，therefore，research achievements may not only can play a reference guiding role for the theoretical research，design and construction on grouting technique，but also may provide strong theoretical basis for perfecting the penetration grouting mechanism.