沉管隧道基础压浆垫层粗糙度的影响效应

Influence of Cushion Roughness on Grouting Treatment of Immersed Tunnel

通过模型试验,研究了压浆法进行沉管隧道基础处理过程中,采用粒径为2、5和10 mm的垫层材料时,单孔注浆和双孔同步注浆的浆液扩散情况以及注浆量和注浆压力的变化规律.结果表明:当垫层材料粒径较大时,浆液扩散速度较快;随着垫层材料粒径增大,基础填充密实所需压浆量增加;垫层材料粒径较大时,注浆压力的波动范围较大,注浆泵不易操纵,浆液盘易出现方向性扩散.根据试验结果,选择垫层材料的粒径时,可综合考虑扩散速度、注浆量和压力等控制因素.

Changes of cushion roughness caused by scraping-paving and change of particle size will affect slurry diffusion, grouting volume and grouting pressure, when adopting grouting method in foundation treatment of immersed tunnel. Model test was conducted to analyze slurry diffusion, grouting volume and grouting pressure during single-hole grouting and dual-hole grouting, adopting 2mm, 5mm and 10mm di- ameter particles for cushion. It was indicated that the velocity of slurry diffusion and grouting volume in- creased with the increase of cushion particle size. The range of grouting pressure fluctuation would be lar- ger when adopting larger particle size cushion, the grouting pump would be difficult to control and the slurry diffusion would turn to one direction. Based on the test result, the slurry diffusion velocity, grou- ting volume and grouting pressure ought to he considered comprehensively when choosing cushion particle size.