港珠澳大桥人工岛隧道混凝土结构抗裂性能研究

Research on Anti-crack Performance for Concrete of Artificial Island Tunnel of Hong Kong-Zhuhai-Macao Bridge

港珠澳大桥人工岛隧道采用现浇混凝土结构,具有强度高、断面尺寸大,工程所处环境恶劣,抗裂性能要求水平高,防裂难度大等特点。为保证人工岛隧道混凝土结构的低渗透、高抗裂以及长寿命的设计要求,通过典型结构的有限元仿真模拟计算,分析其温度和应力的分布规律,明确防裂目标,提出针对性的防裂措施,降低混凝土的开裂风险。

As the high strength,large section size and severe service environment for the cast-in-suit concrete construction in the artificial island tunnel of the Hong Kong Zhuhai Macao Bridge,crack control of concrete was difficult. The design requirements for concrete of the artificial island tunnel were low permeability,high resistance crack and long service life. In order to meet these requirements and reduce the cracking risk of concrete,the distribution law of temperature and thermal stress was analyzed,the targets of anti-crack are defined, and the corresponding measures were put forward, through the simulation analysis of typical construction.