格构式地连墙在沉管隧道护岸工程中的应用——以广州南沙明珠湾区跨江通道护岸工程为例

Application of Lattice Diaphragm Wall in Immersed Tube Tunnel Bank Protection Project

摘要:

跨江隧道结构沉管施工需对河床基槽进行浚挖，基槽拓宽挖深导致现有护岸结构安全性不足，需重新加固改造护岸结构。格构式地连墙由于稳定性良好，不需内部支撑体系，且变形可控，适用于沉管隧道护岸工程中，并可以作为永久护岸结构。以广州南沙明珠湾区跨江通道护岸工程为实例，介绍了格构式地连墙在其中的应用，采用数值模拟计算其变形量，探讨其适用性和安全性。

Abstract:

It is required to dredge the riverbed foundation trough for the construction of immersed tube of river-crossing tunnel structure. The widening and deep dredging of the foundation trough lead to the insufficient safety of the existing bank protection structure. It is necessary to reinforce again and reconstruct the bank protection structure. Due to good stability, the lattice diaphragm wall does not require an inner support system, and the deformation can be controlled. The lattice diaphragm wall is suitable for the immersed tune tunnel bank protection projects, and can be used as the permanent bank protection structure. Taking Guangzhou Nansha Mingzhu Bay Area River-crossing Channel Bank Protection Project as an example, the application of lattice diaphragm wall in this project is introduced. Its deformation is calculated by the numerical simulation. Its applicability and safety are discussed.