水底隧道护岸工程遮帘桩和T型地连墙复合结构方案探讨--以广州鱼珠水底隧道护岸工程为例

A Study of the Structure of Curtain Pile Combined with T-shaped Diaphragm Wall in Underwater Tunnel Revetment Project

在水底隧道对河床基槽进行浚挖施工时,基槽的挖深拓宽会破坏原有护岸结构,降低其安全性能。对此,结合广州鱼珠水底隧道珠江护岸工程,将遮帘桩T型地连墙复合结构与格构式地连墙进行对比,按因地制宜原则选用遮帘桩和T型地连墙复合支护结构;通过三维有限元方法对其水平位移、结构应力等进行模拟仿真计算与分析,探讨其适用性及安全性,并进行优化设计。针对施工区域存在强风化泥质粉砂、淤泥等影响槽壁稳定性、易导致坍塌的不良工况,合理采取施工技术破解难题,最终通过施工监测,各项数据均符合规范要求。

The excavation depth and widening of the foundation trench will damage the existing revetment structure and reduce its safety performance.Combined with the Pearl River revetment project of Yuzhu underwater tunnel in Guangzhou,the curtain pile T-shaped diaphragm wall composite structure is compared with the lattice diaphragm wall.The curtain pile and T-shaped diaphragm wall composite support structure are adopted according to local conditions.Its horizontal displacement and structural stress are simulated and analyzed by three-dimensional finite element method,its applicability and safety are discussed,and the design is optimized.In view of the adverse working conditions such as strongly weathered argillaceous silt and sludge in the construction area,which affect the stability of the tank wall and easily lead to collapse,some construction technologies are reasonably adopted to solve the technical problems.