高水头条件下管道裂隙浆液封堵机制试验研究

Experimental Study on Slurry Sealing Mechanism of Pipeline Fracture under High Water Head

针对高水头下管道裂隙浆液留存率低、封堵效果差的问题,通过自主设计的可视化动水注浆试验平台,开展了高水头管道裂隙注浆封堵试验研究,探讨了影响管道裂隙浆液封堵的主次因素,揭示了水灰比、注浆压力及动水流速对水泥浆液封堵效果的影响。研究结果表明:影响高水头管道裂隙浆液封堵沉积厚度及逆向扩散距离的因素依次为动水流速、水灰比、注浆压力;在合理水灰比条件下,浆液沉积厚度及逆向扩散距离随注浆压力增大而单调递增;浆液逆向扩散距离相比沉积厚度对动水流速变化更加敏感。

To address the problems of the low slurry retention rates and poor sealing effect in pipe cracks under the high water head,a slurry sealing experimental study of the high water head pipe cracks was carried out based on a self-designed visualized dynamic water grouting test platform.The main and secondary factors affecting the slurry sealing of pipe cracks were explored and revealed respectively,as well as the effects of water-cement ratio,grouting pressure,and dynamic water flow rate on the sealing effect of cement slurry.The results show that the dynamic water flow rate,water-cement ratio,and grouting pressure are the primary and secondary factors affecting the deposition thickness and reverse diffusion distance of slurry sealing in the high water head pipe cracks,the slurry deposition thickness and reverse diffusion distance increase monotonically with the increase of grouting pressure under reasonable water-cement ratio conditions,the slurry reverse diffusion distance is more sensitive to the change of dynamic water flow rate than the deposition thickness.