This 3D numerical study presents the factors affecting displacements and rotations induced by deep excavation in the vicinity of a tall building with an emphasis on the building parameters. An accurate model of a 31.2 m deep excavation with an adjacent 12-story building was used to validate the numerical modeling. Plane strain analysis of the excavation-induced deformations using building surcharge method proved the inadequacy of the surcharge method regardless of the building stiffness. Although the results of the equivalent beam method and the building structural method was in general conformity with each other, modeling structural details of the building showed better capability in capturing even local interactions of the building and the excavation. Parametric study in 3D conditions investigated effects of the buildings position and dimensions on displacement interaction by examining the development of a potential failure surface (PFS). The results showed that the building’s position and dimensions relative to the PFS as well as the building proximity to the excavation corner play decisive roles on determination of the excavation induced displacements/rotations and should be considered in the design of the excavation support system near buildings.

这项3D数值研究提供了影响高层建筑附近深挖引起的位移和旋转的因素，并着重于建筑参数。使用精确的31.2 m深开挖与相邻的12层建筑物的模型来验证数值模型。使用建筑物附加费法对开挖引起的变形进行平面应变分析证明，无论建筑物的刚度如何，附加费法均不足。尽管等效梁方法和建筑物结构方法的结果总体上是一致的，但是建筑物的结构细节建模显示出更好的捕获建筑物和基坑局部相互作用的能力。在3D条件下的参数研究通过检查潜在破坏面（PFS）的形成来研究建筑物位置和尺寸对位移相互作用的影响。结果表明，建筑物相对于PFS的位置和尺寸以及建筑物靠近开挖角在确定开挖引起的位移/旋转方面起着决定性的作用，应在建筑物附近的开挖支护系统设计中加以考虑。