地铁车站地下连续墙大跨度破除的支撑设计优化及稳定性分析

Support Design Optimization and Stability Analysis of Large-span Dismantlement of Diaphragm Wall in Metro Station

某地铁车站主体结构与附属结构之间隔有1道地下连续墙,因两结构为功能互通区,故需破除该地下连续墙。但一般采用的跳仓法破除方案存在破除跨度小、施工速度慢、结构施工缝密集导致后期渗漏水严重等缺点。基于此,结合天津地铁某地下2层标准车站施工实际,对主体与附属结构之间的地下连续墙进行大跨度破除的支撑设计优化,同时结合施工监测数据对优化结果进行分析,结果表明该优化方案可行,可为类似工程提供借鉴。

There is a diaphragm wall between the main structure and the subsidiary structure of one metro station.Because the two structures are functional interchange zones,the diaphragm wall needs to be broken and dismantled.However,there are some shortcomings in the commonly used sequence method,such as small span,slow construction speed,and serious water leakage in the later stage caused by dense construction joints.Based on this,combined with the construction practice of a 2-storey underground standard station of Tianjin Metro,the support design optimization of large span dismantlement of diaphragm walls with main and subsidiary structures is carried out.At the same time,the optimization results are analyzed based on the construction monitoring data.The results show that the optimization scheme is feasible and can provide reference for similar projects.