摘要
以南京地铁机场线盾构隧道近距离穿越高速铁路连续梁桥为背景,通过现场监测和有限元计算,研究盾构下穿施工对桥梁上部结构的影响。研究结果表明:由于盾构隧道所处的地层较好、埋深较大,且盾构隧道施工对于地层的扰动较小,所以盾构隧道施工对于桥梁下部结构的影响很小;由盾构隧道施工引起的梁体附加变形很小,均满足控制要求;盾构隧道施工引起的桥梁附加内力既对桥梁的受力起到好的作用也有不良作用,且附加力的量值很小,不会对桥梁的正常使用产生影响。
Taking a shield tunneling project as the background,which crosses under a bridge of high-speed railway on the Nanjing Metro Airport Line,and based on field monitoring and finit element calaculation,the influences of undercrossing shield tunneling on the superstructure of continuous beam bridge are studied. The result indicates that,due to the big burial depth,the small strata disturbance of shield tunnel and the better geological conditions,the shield tunnel construction has minor influences on the substructure of bridge; additional deformations of the beam caused by tunnel construction are very obvious and thus could meet the control requirements. Besides,the additional internal forces of bridge caused by tunnel construction have both plus and minus effects on the substructures of continuous bridge, the magnitude of additional internal forces is rather small,therefore it would not affect the normal operation of the bridge.
出处
《城市轨道交通研究》
北大核心
2016年第4期38-41,共4页
Urban Mass Transit
关键词
盾构隧道下穿施工
高铁桥梁
沉降
变形
undercrossing shield tunneling
high-speed railway bridge
settlement
deformation
