沉管隧道基础灌砂等比例圆形模型试验研究  

Experimental Study on Equal Proportion Circular Model of Sand Filling for Immersed Tunnel Foundation

作　　者：郭靓 贺维国 范国刚 GUO Liang;HE Weiguo;FAN Guogang(China Railway Liu Yuan Group Co.,Ltd.Tianjin 300308,China;China Railway Underground Space R&D Center Tianjin 300123,China;Enterprise Key Laboratory of Tunnel Design and Saftey Assessment Tianjin 300123,China)

机构地区：[1]中铁第六勘察设计院集团有限公司,天津300308 [2]中国中铁地下空间专业研发中心,天津300123 [3]天津市隧道设计及安全评估重点实验室,天津300123

出　　处：《广东土木与建筑》2025年第2期85-89,共5页Guangdong Architecture Civil Engineering

基　　金：天津市隧道设计及安全评估重点实验室重点研发计划项目(2015-SYSZD-02)。

摘　　要：针对沉管隧道基础灌砂工艺过程中出现的的砂垫层物理力学性质难以确定、实际施工工艺参数以及材料选择主观性强,施工质量不易把控等问题,首先通过初步模型试验,获得不同砂料级配、不同砂水比对砂盘扩散速度、扩散半径和密实度的影响规律。再采用与工程施工情况相同的设备和模型材料开展等比例灌砂试验模型,通过对砂盘密实度检测,验证了灌砂工艺的可靠性。通过佛山某隧道工程施工验证,灌砂压力控制在0.06~0.08 MPa之间,砂盘溢出管外2 m,砂盘堆积体高出管节底面0.3 m情况下,隧道底部砂盘基本密实,管节最终沉降满足功能要求。In view of the problems that the physical and mechanical properties of the sand cushion formed by the sand filling method for the foundation of immersed tunnel are difficult to obtain,the actual construction process parameters and material selection are highly subjective,and the construction quality is not easy to control,passing preliminary model test,the effects of different sand gradation and sand water ratio on the diffusion velocity,diffusion radius and compactness of sand tray were obtained.The equal proportion sand pouring test model adopts the sand pouring equipment and model materials during the actual construction,and the compaction degree of the sand disk was verified through detection to ensure the reliability of the filling sand process.Through the construction verification of a tunnel project in Foshan,the sand filling pressure is controlled between 0.06~0.08 MPa,When the sand disc overflows 2 m outside the pipe and the sand disc accumulation is 0.3 m higher than the bottom surface of the pipe section,the sand disc at the bottom of the tunnel is basically dense,and the uneven settlement of the pipe section meets the functional requirements.

关 键 词：沉管隧道 灌砂 模型试验 等比例 密实度 沉降 

分 类 号：U452[建筑科学—桥梁与隧道工程]