The deformation characteristics of a weak foundation with high back siltation in an immersed tunnel lack empirical data; however,\nthe calculation method and control of foundation settlements are highly important to tunnel design and construction. This paper\ntakes a cross section of the natural foundation of an immersed tunnel in the Hong Kong-Zhuhai-Macao Bridge (HZMB) as the\nresearch object and conducts a centrifuge model test.Thesoil layer is divided, and the soil parameters are determined by the CPTU\nand the indoor dynamic three triaxial test. In consideration of the actual engineering scale and the ability of the centrifuge model\ntest system, the similarity ratio of the model to the prototype is studied and determined. As for the immersed tube structure, the\ndeformation characteristics are mainly studied. Therefore, the organic glass is selected as the model material by the similarity of\nthe elastic modulus and the density. The characteristics of the resilience and recompression of the natural foundation of the\nimmersed tunnel and the strain characteristics of the immersed tube structure are obtained by the analysis of the multiworking\ncondition test data. Moreover, based on the actual engineering geological conditions of the subsea tunnel, a numerical calculation\nmethod is carried out to check the reliability of the centrifuge model test results. The results of the numerical calculation are\nconsistent with the model test results.
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