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为了探索适合青岛胶州湾海底隧道陆域大断面段施工过程中的最合理施工工法,采用三维有限差分软件FLAC3D对4种常用施工工法进行数值计算优化分析,分析结果表明:双侧壁导坑法即眼镜法对地表沉降、洞周收敛和围岩稳定的影响方面要优于其他工法,而CD法施工主要对衬砌安全方面效果最佳。在实际施工过程中,综合考虑施工工期、进度、隧道埋深、洞径等,选择最佳施工工法。由于青岛海底隧道陆域大断面段隧道跨度较大,净空高,开挖台阶也高,致使钢支撑质量较大,安装困难,不宜使用CD法,最终确定选择双侧壁导坑法施工。通过实际工程验证,双侧壁导坑法在青岛胶州湾海底隧道陆域大断面段取得了显著的社会、经济效益,为今后类似工程对于该种工法的应用起到了很好的借鉴和指导作用。
In order to explore the most reasonable construction method suitable for the construction of large section of land area of Jiaozhou Bay submarine tunnel in Qingdao, three kinds of common construction methods were optimized by using three-dimensional finite difference software FLAC3D. The results show that: In other words, the optical method is better than other methods in the influence of surface subsidence, the convergence of the surrounding rock and the stability of the surrounding rock. However, the CD method construction has the best effect on lining safety. In the actual construction process, considering the construction period, progress, tunnel depth, hole diameter, choose the best construction method. Due to the large span and large clearance height of the large cross-section section of Qingdao subsea tunnel, the excavation step is also high, resulting in a large steel support quality and difficult installation. Therefore, it is not appropriate to use the CD method. Through practical engineering verification, the double-sidewall pilot method has made significant social and economic benefits in the large cross-section of the Jiaozhou Bay submarine tunnel in Qingdao, which has played a good reference and guidance for the application of this method in similar projects in the future .