基于扩散-对流模型的海底混凝土隧道耐久寿命预测

doi:10.11896/cldb.21060165

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Abstract Considering the service environment characteristics of submarine tunnel subjected to aggressive high pressure seawater and the unsaturated characteristics of high performance concrete, the chloride ion diffusion-convection transport model and the durability life prediction model of submarine concrete tunnel were established. Using Shenjiamen submarine tunnel in Zhoushan as the engineering background, the calculation parameters were determined through indoor experiments, and the process of environmental chloride ions intruding into the tunnel was numerically simulated by TOUGH2 software, which obtained the time-dependent law of chloride ion transmission, as well as the action law of water head, initial saturation of concrete, and mass fraction of ambient chloride ions. Then the differences between diffusion, saturated diffusion-convection, and unsaturated diffusion-convection prediction models were compared. The results show that the accumulation of chloride ion mass fraction is the highest in the axillary position of the tunnel; the head and ambient chloride ion mass fraction are positively correlated with the growth of chloride ion mass fraction, and the initial saturation of concrete is negatively correlated with the growth of chloride ion mass fraction; the durability life of the tunnel is the longest according to the diffusion model and the shortest according to the unsaturated diffusion-convection model.

Key words： submarine tunnel unsaturated concrete diffusion-convection chloride ion durability life

Published: Online: 2023-03-27

CLC number:

U459.5

Fund:National Natural Science Foundation of China (51878609) and the Natural Science Foundation of Zhejiang Province of China (LY21E080005).

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	Articles by authors
	ZHANG Yuanzhu
	YANG Jiaming
	WEI Gang
	HUANG Senle

Cite this article:

ZHANG Yuanzhu,YANG Jiaming,WEI Gang, et al. Durability Life Prediction of Concrete Submarine Tunnel Based on the Model of Diffusion-Convection[J]. Materials Reports, 2023, 37(6): 21060165-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21060165 OR http://www.mater-rep.com/EN/Y2023/V37/I6/21060165

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