生物岛-大学城沉管隧道灌砂试验及结果分析  

Sand Flowing Experiment and Experiment Result Analysis:Case Study on Shengwudao-Daxuecheng Immersed Tunnel

作　　者：王光辉[1] 李治国[1] 程晓明 宋妍[1] 

机构地区：[1]中铁隧道集团科研所,河南洛阳471009 [2]中隧集团广州指挥部,广州510320

出　　处：《隧道建设》2009年第2期176-180,共5页Tunnel Construction

摘　　要：基础灌砂是沉管隧道施工中的重要环节,通过试验模拟灌砂过程,寻找各参数之间的相互关系,对原设计灌砂配合比进行验证分析。单孔灌砂时,除4个角外,管节模型底部砂盘溢出,砂盘表面平坦密实;双孔灌砂时,先灌砂孔部位发展相对较好,砂盘扩展充分。不同配合比砂盘的发展有所不同,同等灌砂压力下含砂量越高,扩散半径越小。砂基础承载力和密实度完全满足设计要求,但砂盘密实度由于不同的配合比有所差别,砂盘边缘处与冲击坑边缘处密实度相对较低。Sand flowing is an important step in the construction of immersed tunnels. Simulation experiment is executed in order to obtain the relationship among the parameters and to verify the mixing proportion of the sand to be filled that has been originally designed. In case the sand is flowed through a single opening, the sand overflows under the bottom of the element except the four corners and the sand pancake has smooth and compact surface. In case the sand is flowed through two openings, the area where sand flowing is made earlier develops better and the sand pancake expands fully. The developments of sand pancake with different mixing proportions vary. Under the same sand flowing pressure, the higher the sand content, the smaller the diffusion radius becomes. The experiment demonstrates that the load-bearing capacity and compactness of the sand foundation can satisfy the design requirements completely, the compactness of the sand pancakes vary depending on the mixing proportions and the compactness at the edges of the sand pancakes and dents is low.

关 键 词：沉管隧道 砂盘 冲击坑 扩散半径 密实度 

分 类 号：U455.46[建筑科学—桥梁与隧道工程]