盾构隧道下穿地下直径线保护措施设计及分析  

PROTECTION MEASURS AND NUMERICAL ANALYSIS OF SHIELD TUNNEL UNDERCROSSING UNDERGROUND DIAMETER LINE

作　　者：梁飞 LIANG Fei(China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《低温建筑技术》2020年第2期88-91,共4页Low Temperature Architecture Technology

基　　金：中国铁建股份有限公司科技研究开发计划课题(11-65C)。

摘　　要：北京地铁16号线木樨地站-达官营站区间下穿京九铁路、北京地下直径线,盾构穿越存在较大风险。根据穿越情况,提出了铁路沉降控制标准。对木达区间穿越地下直径线进行了加强措施设计,在施工风险控制措施的基础上,建立了盾构下穿京九铁路、地下直径线的三维有限元分析模型,分析了不同模拟施工步下竖向位移变化规律。通过三维数值计算,京九铁路、地下直径线U型槽结构位移满足控制标准,且尚有位移余量,结构处于安全状态。研究结论可为类似工程提供一定的借鉴与参考。The subway section from Muxidi Station to Daguanying Station of Beijing Metro Line 16 undercrossed the Beijing-Kowloon railway and Beijing underground diameter line,in which the undercrossing risk of shield tunnel is great.Based on the present status in this field at home and abroad,the control standard of railway displacement is proposed.The design of control measures for Beijing subway diameter line are also proposed in detail.Furthermore,a three-dimensional FEM model of shield tunnel undercrossing the Beijing-Kowloon railway and Beijing subway diameter line is established.The vertical displacement under different simulated steps is analyzed.Through three-dimensional numerical calculation,the displacement of the Beijing-Kowloon railway and Beijing subway diameter line meets the required standard and the railway structure is in a safe state during the undercrossing process.The results can be referred in similar projects in the future.

关 键 词：盾构隧道 保护设计 施工风险 三维数值模拟 

分 类 号：TU714[建筑科学—建筑技术科学]