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Under the influence of many complex factors, such as flood, tidal power, ship operation, earthquake and construction quality, the stability of the tunnel’s underwater overburden layer is crucial to the safe operation of the project. A technical line combined with measured data analysisand physical model testing were utilized to study the features of scouring and sediment for tunnel overburden under several extreme hydrodynamic conditions. In order to ensure the rationtity of anti-scouring stability and economy for tunnel engineering project, optimization design for overburden layer of tunnel was proposed after detailed experiments and analysis. The slurry block stone and stone throwing method can be used to protect the slope and the bottom of the embankment downstream of the tunnel line, which can effectively control the possiblescouring of the concave embankment foot and river bed. The technical line and research methods applied in this paper can be extended to statisfy the engineering design optimization for overburden layer of similar tunnel engineering.

Study on optimization technology of protective engineering for submerged tube overburden in crossing river tunnel