坡度对沉管隧道压浆法基础处理浆液扩散特性影响.pdfVIP

45 5 上 海 交 通 大 学 学 报 Vol. 45 No. 5 20115 JOURNAL OF SH ANGH AI JIAOT ONG UNIVERSIT Y May 2011 : 100 24 7( 2011) 050 2905 李 科, 杜家论, 黄醒春 ( , 200240) : 针对砂石垫层的不平整或沉管隧道本 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. : 沉管隧道; 基础处理; 压浆法; 坡度; 浆液扩散 : U 455. 4 : A Influence of Slope on Slurry Diffusion in Grout ing Treatment of Immersed Tunnel L I K e, D U J i alun, H UA N G X i ng ch un ( Department of Civil Engineering, Shanghai Jiaotong U niversity, Shanghai 200240, China) Abstract: Slopes caused by unevenness of cushion or tunnel design w ill affect slurry diffusion, w hen adop ting grouting method in foundation treatment of immersed tunnel. Model test w as conducted to study slur ry diffusion of singlehole and dualhole grouting w ith different slopes. It w as indicated that diffusion ve locity along dow nhill direction w ould be larger than that along uphill direction apparently, w hich show s that the flow of slurry is influenced by the gravity obviously , trending to the low er position. With the lar ger slope, the difference betw een diffusion velocity along uphill and dow nhill direction w ould be greater. Based on the test result, it ought to inject at the low est grouting hole firstly, and along the uphill direction in turn, to avoid voids. Key words: immersed tunnel; foundation treatment; grouting method; slope; slurry diffusion 1894 , , . , , 1. 1~ 1. 2, , , . .