上海交通大学学报

上海交通大学学报（自然版） ›› 2011, Vol. 45 ›› Issue (05): 629-633.

• 交通运输 •    下一篇

坡度对沉管隧道压浆法基础处理浆液扩散特性的影响

 李科, 杜家论, 黄醒春   

  1. (上海交通大学 土木工程系， 上海 200240)
  • 收稿日期:2010-11-19 出版日期:2011-05-30 发布日期:2011-05-30

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

 LI  Ke, DU  Jia-Lun, HUANG  Xing-Chun   

  1. (Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Received:2010-11-19 Online:2011-05-30 Published:2011-05-30

摘要： 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.
 

关键词: 沉管隧道, 基础处理, 压浆法, 坡度, 浆液扩散

Abstract: 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 larger slope, the difference between diffusion velocity along uphill and downhill direction would be greater. Based on the test result, it ought to inject at the lowest grouting hole firstly, and along the uphill direction in turn, to avoid voids.

Key words: immersed tunnel, foundation treatment, grouting method, slope, slurry diffusion

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