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厦门海底隧道翔安段在进入海域前,须下行穿越浅滩富水砂层。由于砂层富水性好,且含水层与海水连通,具有较高承压性,隧道掘进面临较大工程风险。着重介绍了隧道在穿越浅滩富水砂层的技术方案,并对方案实施的效果进行分析。分析表明,采用地表处理并结合洞内加固的技术方案可有效阻断海水对含水层的补给,控制承压水,并保证主隧道掘进顺利开展。该实施方案为此类工程难题的解决积累了宝贵的经验。
Xiang An Section of Xiamen Subsea Tunnel before entering the sea, shall be descending through shallow shoal sand. Due to the high water-bearing capacity of the sand layer and the high aquatic pressure in the sea, the tunnel boring faces a greater risk of engineering. The technical scheme of tunnel crossing shallow shoal sandstone is emphatically introduced, and the effect of scheme implementation is analyzed. The analysis shows that the surface treatment combined with the technical scheme of reinforcement in the tunnel can effectively block the supply of seawater to the aquifer, control the confined water and ensure the smooth tunneling of the main tunnel. This embodiment has accumulated valuable experience for the solution of such engineering problems.