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Abstract In order to explore the law of sand deposit expansion in the sand foundation treatment process treated by sand flow method in the immersed tube tunnel engineering，full-scale test model was built and sand-deposit detector was developed. Changes of sand deposit shape and sand deposit expansion size with time under different experimental conditions were obtained through eight experiments. The analysis result shows that sand grains deposit around the vent in ring-shaped and form crater and sand deposit gradually. Gap and chute for flow form on the top of the sand deposit，elongating basically along the radial direction and distributing randomly on circumferential direction. Sand grains are carried from the gap and chute and deposit on the outer margin surface of the sand deposit，in which oblique layered texture is formed. The factors such as the mass ratio of sand-water，the boundary conditions，the foundation trench and the roughness of the model board have a major impact on the expansion process of the sand deposit but not significantly impact the final size and the density. The test results may be help to design and construction of the Zhoutouzui immersed tube tunnel in Guangzhou.
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Received: 08 August 2011
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2012, Vol. 31 
