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为研究泥砂介质中注浆扩散过程及其通道渗流与孔隙渗透的力学机理,基于高压密封注浆实验系统进行注浆实验,得出注浆扩散过程是由浆液在通道渗流和通道周边孔隙渗透组成。运用流体力学推导分析了指形渗流通道内液体渗流过程的压力变化,得出浆液压力损失随浆液黏度、渗流通道长度、注浆量的增大而增大,随着浆液渗流孔径的增长而减小;推导了单相指型通道周边孔隙渗透的扩散半径关系式,提出了改善注浆效果的措施,该措施在中煤平朔井工三矿过风氧化带工程实践取得很好的效果。
In order to study the mechanics of grouting diffusion and its seepage and pore penetration in silt media, the grouting experiment was carried out based on high-pressure sealing grouting experimental system. It was concluded that the grouting diffusion process consisted of grout seepage in the channel and pore penetration around the channel . The pressure variation of liquid seepage in finger seepage channel was analyzed by hydrodynamics. The result showed that the pressure drop of slurry increased with the increase of slurry viscosity, seepage channel length and grouting volume. With the increase of seepage flow pore size, The relationship between the diffusion radius and the grouting radius of single-phase finger-shaped channel was deduced, and the measures to improve the grouting effect were put forward. This measure has achieved good results in the engineering practice of the over-air oxidation zone of No.3 mine of Pingshuo Jingong coal mine.