下穿铁路的盾构隧道纵向力学行为研究

采用梁-地层弹簧模型,进行了在铁路列车荷载作用下盾构隧道纵向力学行为有限元分析。结果表明:当等效的管片环数较多时,环数的变化对其纵向刚度的影响很小,两侧计算边界取1倍上部荷载作用长度;当盾构隧道的埋深大于2倍隧道外径时,纵向内力和变形很小,满足强度和刚度要求,其纵向设计不需特殊考虑;随着埋深的增加,列车荷载所产生的管片纵向附加内力和变形减小。

Study on Vertical Mechanical Behavior of Shield Tunnel of Underpass Railway

With beam-shell spring model,this paper carries out finite element analysis on vertical mechanical behavior of shield tunnel under the effect of trains load.The result indicates that when there are many equivalent segment joints,the changes of joints has little influence on vertical rigidity,so it just takes the length of upper load part on both sides for calculation;when the buried depth of shield tunnel is greater than twice outer diameter,vertical inner force and deformation are little,which can satisfy ...