隧道施工引起的地表建筑物三维变形特性研究(英文)

Study on Characteristics of Structural Three-Dimensional Deformations Induced by Tunneling

针对隧道施工引起建筑的三维变形特性研究,特别是建筑平面外变形如扭曲变形较少的情况,论文通过建立建筑-土体-隧道相互作用的三维有限元模型,分析不同建筑刚度、不同建筑与隧道轴线交角以及不同建筑偏心距下建筑结构的三维变形特性,得到相同施工条件下,建筑刚度和平面布置对建筑变形的影响.结果表明:建筑刚度和位置的改变对建筑基础沉降、建筑的倾斜和扭曲变形影响明显;随着建筑刚度和穿越角度的减小,建筑物变形增加明显,最大增幅达3倍;建筑变形的分布特征及变化发展趋势也随计算工况的改变明显不同.在评价隧道施工对建筑的影响时,若不考虑建筑的存在,会高估隧道开挖引起的地表沉降;若不考虑隧道施工过程,则会低估建筑的倾斜和扭曲变形.

The aim of this paper is to study the influence of structural stiffness and layout such as the angle between tunnel centerline and building longitudinal axis,the eccentricity to the tunnel centerline on structural three-dimensional deformation.Analysis is performed using a series of 3D finite element models,which take into account the building-soil-tunnel interaction and the process of tunneling.The obtained results from this numerical work show that the building stiffness and layout has notable effects on the building settlements,tilt and twist deformations.The structural deformations increase significantly with the decrease of stiffness and the crossing angles.It rises by 3 times at most.The distributions of the building deformations are changed in different conditions.In evaluating the effects of tunneling on the buildings,the ground movements induced by tunneling would be overestimated if the existence of the buildings is ignored.It can also be noted that neglecting the construction of the tunnel leads to notable underestimation of the building tilt and twist deformations.