预留地铁盾构超近距离大角度穿越条件的隧道深基坑设计  

Design of Deep Foundation Pit for Subway Shield Tunneling with Ultra-short Distance and Large-angle Conditions

作　　者：张建安 ZHANG Jianan

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海市200092

出　　处：《城市道桥与防洪》2022年第8期225-227,241,M0023,共5页Urban Roads Bridges & Flood Control

摘　　要：为确保隧道深基坑开挖及结构回筑的安全和稳定,并为规划地铁盾构超小净距大角度穿越施工预留条件,以某隧道工程为例,研究了在隧道基坑设计中采用短地下连续墙+长工法桩的围护结构及相关加固和构造措施的可行性。根据计算分析及实际监测数据验证,该方案施工过程中隧道围护结构变形、地表沉降及整体稳定性均符合设计工况及规范要求,且后期地铁盾构亦实现顺利穿越,并未对隧道结构产生不利影响,表明该总体基坑设计方案经济可行,可为日后类似相关工程提供参考。As a tunnel project as an example, the enclosing structure of short underground diaphragm wall +long construction method pile, the relative reinforcement and structural measures taken in the design of tunnel foundation pit are studied to ensure the safety and stabilization of deep foundation pit excavation and structural rebuilding of tunnel. And the conditions are reserved for the ultra-short distance and large-angle tunneling of the planned subway shield. Based on the computational analysis and the practical monitoring data validation, the enclosing structure deformation, ground surface settlement and overall stability of tunnel all meet the design conditions and standard requirements in the construction of this scheme. And in the later period, the smooth tunneling of subway shield is also realized, and has no adverse effect on the tunnel structure, which shows that the overall design scheme of foundation pit is economic and feasible, and can be referred for the similar projects in the future.

关 键 词：隧道交叉 超小净距 大角度穿越 短地墙 长工法桩 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]