地铁共建综合管廊中超深工作井关键设计方法

Key Design Method of Ultra-deep Shaft of Utility Tunnel Built with Metro

以深圳地铁共建综合管廊某工作井为研究对象,对超深工作井的关键设计方法进行了介绍。针对基坑自身特点和工作井特殊的工艺,重点分析了咬合桩、侧墙、孔边主梁的受力状态以及主体结构抗浮稳定性,并对实施效果进行了总结。结果表明:咬合桩刚度大,挡土和止水效果好,适用于基坑周边环境要求高的情况;设置抗浮脚趾可有效提高抗浮稳定性;工作井结构设计合理,可为后续同类工程设计提供参考借鉴。

Taking a shaft of the utility tunnel built with Shenzhen Metro as the research object,the key design method of ultra-deep shaft was introduced.According to the characteristics of the pit and special technology of the shaft,the stress state of the secant pile,side wall,beam at hole edge,and the floatation-resistant stability of the main structure were emphatically analyzed.Meanwhile,the implementation effect was summarized.The results reveal that:the secant pile has high rigidity,good soil retaining and water sealing effects,and is suitable for the situation where the surrounding environment has high requirements for the pit;the anti floating toe can effectively improve floatation-resistant stability;the structural design of the shaft is reasonable,which can provide reference for the subsequent similar engineering design.