The excavation and construction of shield tunnel is bound to have different degrees of influence on the existing structures in the upper part.Especially the high-voltage transmission tower and other high-rise structures have high requirements for foundation deformation control and are prone to overturn or even collapse.Therefore,it is of great significance to carry out research on the impact of shield tunnel construction on evaluating the safety of adjacent existing transmission towers.Existing researches mainly focus on the interactions between mountain tunnels and field high-voltage transmission towers,and the researches for shield tunnels are not yet perfect in terms of simulation methods.Based on this,with the background of a domestic underground railroad passage project under the transmission tower,a tunnel excavation model is established through the finite difference software FLAC3D,the influence law of shield tunnel under-passing construction on the foundation of the adjacent transmission tower is studied.Emphasis was placed on calculating the deformation of the strata,the settlement of the transmission tower foundation,the settlement difference and the tilt rate are analyzed,and the calculation results are analyzed with relevant engineering standards,which verifies the safety of the transmission tower,and this paper and its calculation method can be used as a reference for similar transmission projects.
关键词
输电杆塔/盾构隧道/数值模拟/隧道施工/沉降变形
Key words
transmission towers/shield tunnel/numerical simulation method/construction of tunnel/settlement deformation
万方数据