沉管隧道地基砂流法处理的充满度试验及分析  

Experiment and Analysis of Filling Degrees in Foundation of Immersed Tube Tunnels Treated by the Sand Flow Method

作　　者：蒋钦权 谷任国[2] 邓磊 房营光[2] JIANG Qinquan;GU Renguo;DENG Lei;FANG Yingguanng(Guangzhou Highway Engineering Company,Guangzhou 510635,China;South China University of Technology,School of Civil Engineering and Transportation,Guangzhou 510640,China)

机构地区：[1]广州公路工程集团有限公司,广州510635 [2]华南理工大学土木与交通学院,广州510640

出　　处：《工业建筑》2022年第3期24-28,共5页Industrial Construction

基　　金：国家重点科学仪器设备开发项目(41827807)。

摘　　要：针对沉管隧道砂流法地基处理过程中沉管上抬、沉管底板粗糙度及不同注砂顺序对砂盘最终扩展半径及间隙填充的影响,建立砂流法足尺试验模型,并通过测量计算砂盘顶面充满度、体积充满度及砂盘半径充满度,探讨上述工况对砂盘扩展均衡性及质量的影响。结合砂盘扩展规律分析表明:管段上抬对砂盘扩展不利,充满度较低,砂盘扩展均衡性及质量较差;管段底面采用光滑的材质,有利于砂盘扩展,充满度较高,可提高砂盘的扩展均衡性及质量;不同注砂顺序造成的适当的边界封堵,有益于提高砂盘的充满度,改善砂盘的扩展均衡性及质量,对最终砂盘扩展均衡性和间隙填充质量无不利影响。According to the influence of the lifting for immersed tubes, the roughness for bottom plates of immersed tubes and different injection sequences on the final expansion radius and gap filling of sand-deposite in the process of foundation treatment for immersed tube tunnels by the sand flow method, a full-scale test model of the sand flow method was constructed, and the influences of the above conditions on the expansion equilibrium and quality for sand-deposite were discussed by measuring and calculating filling degrees of the top surface, volume and radius of sand-deposite. Combined with the analysis of the expansion laws of sand-deposite, it was shown that the upward lifting of the pipe section was unfavourable to the expansion of sand-deposite, lower the filling degree was, poorer the expansion equilibrium and quality of sand-deposite were;the smooth material was used at the bottom of the pipe sections, which was conducive to expansion of sand-deposite and had a high filling degree and could improve the expansion equilibrium and quality of sand-deposite;the appropriate boundary sealing caused by different sand injection sequences would benefitted the improvement on filling degree of sand-deposite, improve the expansion equilibrium and quality of sand-deposite, and had no adverse effect on the final expansion equilibrium and filling quality of sand-deposite in gaps.

关 键 词：隧道工程 地基处理 砂流法 模型试验 砂盘 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]