以南昌红谷沉管隧道为例，建立物模灌砂试验，实践表明砂水比1∶8～1∶12、水泥熟料掺量6%、灌砂压力控制在0.1～0.15 MPa，砂积盘半径能达到7.5～8 m。综合灌砂量、压力监测、水下探摸、管内测量4种监测方式，并利用全波场无损检测法和冲击映像法相结合的方式进行灌砂过程监测及其充填效果综合评价，得出结论： 中孔以扩散半径达到7.5～8 m及充盈度≥65%为终孔指标，边孔以扩散半径达到7.5～8 m及溢砂与前一孔溢砂融合为终孔指标，进而指导砂泵压力及停泵时间；通过合理配置灌砂设备及选择优质灌砂料，并分析灌砂施工中出现的问题及解决对策，E1—E6管段基础灌砂完成后，管段沉降值均在可控范围内，表明沉管管段灌砂基础质量可靠。

A physical model of sand filling test for Honggu Immersed Tunnel in Nanchang is established. The results show that the radius of sand accretion disk can reach 7.5-8 m when sandwater ratio reach 1∶8-1∶12, cement clinker content reaches 6% and sand filling pressure reaches 0.1-0.15 MPa. A series of technologies, including sand filling amount monitoring, sand filling pressure monitoring, underwater detection, tunnel segment measuring, fullwavefield nondestructive detection method and impact imaging method, are adopted. Some conclusions are drawn as follows: 1) The pressure and stop time of the sand filling pump for intermediate sand filling holes can be decided when the sand diffusion radius reaches 7.5-8 m and the filling degree reaches 65%; and that for side sand filling holes can be decided when the sand diffusion reaches 7.5-8 m and the overflowed sand mixed together. 2) The tube settlement is brought under effective control after the sand filling of foundation of E1-E6 segment is finished by choosing rational sand filling equipment and qualified sand materials and analyzing problems and their countermeasures. 