坡度对沉管隧道压浆法基础处理浆液扩散特性的影响

针对砂石垫层的不平整或沉管隧道本身走向设计引起的坡度变化，采用压浆法进行小比例模型试验，研究在不同坡度条件下单孔注浆、双孔同步注浆时的浆液扩散情况.结果表明，带纵坡注浆时，沿纵坡下坡方向的扩散速度明显大于沿上坡方向的扩散速度，即水下混合砂浆的流动受到重力加速度的影响显著，出现向低处先行扩散流动的趋势，而且当坡度较大时，沿上、下坡方向扩散速度的差异更加明显.在施工过程中，应首先在最低位置注浆孔注浆，然后，沿坡度向上依次注浆，以避免出现基础处理填充不密实的情况.

Influence of Slope on Slurry Diffusion in Grouting Treatment of Immersed Tunnel

Slopes caused by unevenness of cushion or tunnel design will affect slurry diffusion,when adopting grouting method in foundation treatment of immersed tunnel.Model test was conducted to study slurry diffusion of single-hole and dual-hole grouting with different slopes.It was indicated that diffusion velocity along downhill direction would be larger than that along uphill direction apparently,which shows that the flow of slurry is influenced by the gravity obviously,trending to the lower position.With the la...