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以南京市纬三路长江隧道工程明挖段抗浮设计典型节段为背景,建立了考虑抗拔桩作用的隧道主体结构三维板壳-弹簧有限元模型,分析了其计算原理、计算参数选取原则及荷载确定方法,并论证了模型用于实际工程的合理性。在此基础上,通过对抗拔桩作用效果的初步讨论,将抗拔桩等效为大刚度的非线性拉压弹簧以体现其对主体结构的约束支承效果。最后进行计算分析并研究了抗拔桩对主体结构受力及变形特征的影响和抗拔桩的轴力分布规律。
Based on the typical segment of anti-flooding design of bright-digging section in the Yangtze River Tunnel Engineering of Nanjing-Sanjiang Road, the three-dimensional shell-spring finite element model of tunnel main body considering the action of anti-pull pile was established. The calculation principle, calculation parameters Principles and load determination method, and demonstrate the rationality of the model for the actual project. Based on this, through the preliminary discussion on the effect of anti-pulling pile, the nonlinear tension-compression spring which is equivalent to anti-pile is equivalent to large rigidity to show the restraining support effect on the main structure. Finally, the influence of the anti-pile on the stress and deformation characteristics of the main structure and the axial force distribution of the anti-pile are calculated and analyzed.