铁路列车荷载对下穿盾构隧道结构的影响

Impact of Train Load on Shield Tunnel Structure under Railway

以某盾构穿越铁路既有线为背景,采用地层结构法,通过有限元数值模拟,选取对地基加固与不加固两种情况计算铁路列车荷载对盾构隧道的附加动应力影响,然后采用荷载结构法对偏载模式下隧道结构的内力和管片配筋进行了计算分析。结果表明:铁路列车荷载对盾构隧道的附加动应力影响较大,使隧道结构内力增大。加大隧道管片结构的配筋量,对地基进行加固,可以减小附加动应力的影响,从而减小结构内力。

Bases on an engineering example about shield tunnel crossing the existing railway line,this paper adopts layer structure method and finite element numerical simulation to calculate the extra-dynamic-stress-effect of the train load upon shield tunnel structure,in the condition of reinforced and non-reiforced foundations respectively,then adopts load structure method to calculate the tunnel structural internal force in offset load model and the reinforcement of segments.The analytic result shows that the effe...