新建与既有地铁隧道正交段施工力学行为研究  

Research on the Mechanical Behaviors of New Tunnel Construction in the Area Orthogonal to Existing Metro Tunnel

作　　者：张昆[1] 郭菊彬[2] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学峨嵋校区,四川峨嵋614202

出　　处：《铁道工程学报》2010年第2期81-84,共4页Journal of Railway Engineering Society

摘　　要：研究目的:以深圳地铁3号线盾构隧道下穿1号线既有隧道为工程背景,利用FLAC3D软件进行有限元数值模拟施工三维力学行为,探讨施工过程地层应力的变化幅度及影响范围、结构内力及结构安全性,提出确保新建隧道施工和既有隧道运营安全的措施和建议。研究结论:在施工阶段既有隧道附加应力的分布均为以下洞中心线为中心对称轴成左右对称状态,下洞施工过程中会引起既有隧道的沉降和附加应力的增大,目标面盾构隧道管片衬砌最大内力值的位置都在下洞两侧拱腰管片衬砌,应对上下两洞间的地层及时注浆进行加固。当施工结束时,目标面盾构隧道管片的主应力值达到最大。Research purposes： For construction of N Chengdu, Sichuan 610031 China;2. Emei Campus, Southwest o 3 line＇s shield tunnel under - passing the existed No 1 line＇s tunnel of Shanghai metro, the mechanical behaviors of new tunnel construction were simulated with the three - dimensional fast Lagrangian analysis of continua（FLAC3D） method, the change and influencing scope of stratum stresses and the stresses and safety of structure were discussed, and the measures for and proposals to ensuring the construction safety of new tunnel and operation safety of existing tunnel were offered. Research conclusions：The additional stresses distribution of existing tunnel was of laterally symmetrical status which took the central line of new tunnel as symmetry axis in construction process. The subsidence of the existing tunnel occurred and additional stresses of existing tunnel increased during construction of new tunnel. As the maximum internal force in the target face of the tunnel tubular lining appeared on the tubular lining on the arch web on both sides of new tunnel, the stratum between tunnels should be reinforced. When construction was finished, the main stress in the target face of the tubular lining of the shield tunnel became the biggest.

关 键 词：正交段 地铁隧道 附加应力 三维力学行为 

分 类 号：TU311.4[建筑科学—结构工程]