水下盾构隧道耐久性与全生命周期设计

The durability of underwater shield tunnel and its life-cycle design

随着国家的大规模基础设施发展,水下隧道建设需求日益增大,但水下隧道的建设与运维难度较大,需要综合考虑设施的耐久性、进行全生命周期设计。通过分析东京湾横断公路隧道的防水及耐久性措施,为水下大直径隧道建设提出"多重防水、多方防腐、全生命周期设计"的综合耐久性对策;建立以性能和成本为评估指标的全生命周期设计方法,并通过计算评价某海底隧道的不同方案,揭示建设初期充分考虑耐久性、实施全生命周期设计的方案最有利,验证了全生命周期设计方法的有效性。通过构建兼顾经济、安全及环境的全生命周期设计理论体系,可为水下隧道的合理规划设计、科学建造养护提供有力的基础支撑。

With the development of the country’s large-scale infrastructure,the demand for underwater tunnel construction is increasing;however,regarding the construction,operation and maintenance of underwater tunnel are more difficult,the tunnel durability needs to be concerned as well as the life-cycle design.This paper investigated the waterproof and durability measures of the Tokyo Bay Transverse Highway Tunnel,and proposed a comprehensive durability strategy of"multiple waterproof,multi-anticorrosion,and life-cycle design"for the construction of large diameter underwater tunnel.In addition,a life-cycle design method was established with the performance and cost as indicators,and was applied to evaluating of a submarine tunnel under four construction and maintenance plans.As the result,it was clarified that the plan of the high durable tunnel in the initial stage was the most beneficial,and the life-cycle design method was effective.Conclusively,the rational planning and design,scientific construction and maintenance of underwater tunnels could be foundationally supported by development of a life-cycle design system accounting for the economy,safety and environment.