紧邻高层建筑条件下盖挖逆作基坑的T型地下连续墙设计

Design of T-shaped diaphragm wall for foundation pit with cover excavation and reverse construction adjacent to high rise buildings

基于对周边环境的严格保护要求和对地铁安全的高度重视,新加坡地铁基坑设计广泛采用盖挖逆作法,支护结构大量采用整体性好、刚度大、防渗效果好的地下连续墙,并且在基坑内部设置了横墙对地下连续墙进行支撑。但是,由于紧邻高层建筑、管线迁改、交通导改等各种原因,造成了基坑施工难度大、工期长、经济效果差等问题。文章在确保周边高层建筑安全和基坑安全的情况下,创造性地提出采用T型地下连续墙,取消了横墙支撑的方案,对设计方案进行了研究和优化,对类似工程建设具有重要的参考和借鉴意义。

Based on the strict protection of the surrounding environment and the high importance attached to the safety of the underground,the design of the underground pit in Singapore has widely adopted the cover excavation reverse method,and the support structure has adopted a large number of underground diaphragm walls with good integrity,high stiffness and good impermeability,and the diaphragm walls are supported by cross walls inside the pit.However,due to various reasons such as the close proximity to highrise buildings,pipeline relocation and traffic diversion,the construction of the foundation pit is difficult,the construction period is long and the economic effect is poor.In this paper,while ensuring the safety of the surrounding high-rise buildings and the safety of the foundation pit,the T-shaped underground diaphragm wall is creatively proposed and the cross-wall support is eliminated,and the design scheme is studied and optimised,which is an important reference and reference for similar projects.