沉管隧道深水基槽边坡稳定性分析研究

摘要

Slope stability analysis of immersed tube tunnel deep foundation trench is one of the key technologies to decide whether the immersed tube tunnel plan is feasible. Using a single method for slope stability analysis of immersed tube tunnel deep foundation trench has limitations. Combined with the research process on slope stability of the Hong Kong-Zhuhai-Macao Bridge tunnel deep foundation trench, the method for slope stability analysis of immersed tube tunnel deep foundation trench and determination of gradient was put forward by different ways including relationship between slope and soil indexes, theoretical calculation, actual measurement and analysis, experience of similar project. At present, the slope gradient of the Hong Kong-Zhuhai-Macao Bridge project implemented are 1:7 and 1:3 from top to bottom which is the conclusions through this paper.%　　沉管隧道深水基槽边坡的稳定性是决定沉管隧道方案能否可行的关键技术之一。采用单一方法分析沉管隧道深水基槽边坡稳定性有局限性。文章结合港珠澳大桥沉管隧道深水基槽边坡稳定性研究过程，提出通过建立基槽边坡与土体指标关系、边坡稳定性理论计算、实测调研对比分析、类似工程经验借鉴等多种方式进行综合研究，分析和评价深水基槽边坡的稳定性并合理确定深水基槽开挖边坡坡度。目前正在实施的港珠澳大桥工程采用了研究结论所推荐的自上而下1：7、1：3两级变边坡型式。