Deep excavations in dense urban areas have caused damage to nearby existing structures in numerous past construction cases. Proper assessment is crucial in the initial design stages. This study develops equations to predict the existing pile bending moment and deflection produced by adjacent braced excavations. Influential parameters (i.e., the excavation geometry, diaphragm wall thickness, pile geometry, strength and small-strain stiffness of the soil, and soft clay thickness) were considered and employed in the developed equations. It is practically unfeasible to obtain measurement data; hence, artificial data for the bending moment and deflection of existing piles were produced from well-calibrated numerical analyses of hypothetical cases, using the three-dimensional finite element method. The developed equations were established through a multiple linear regression analysis of the artificial data, using the transformation technique. In addition, the three-dimensional nature of the excavation work was characterized by considering the excavation corner effect, using the plane strain ratio parameter. The estimation results of the developed equations can provide satisfactory pile bending moment and deflection data and are more accurate than those found in previous studies.

在过去的许多建筑案例中，人口稠密的城市地区的深基坑挖掘曾对附近现有的建筑物造成破坏。正确的评估在初始设计阶段至关重要。本研究开发了方程来预测相邻支撑开挖产生的现有桩弯矩和挠度。在开发的方程中考虑并采用了影响参数（即开挖几何形状、连续墙厚度、桩几何形状、土壤的强度和小应变刚度以及软粘土厚度）。获得测量数据实际上是不可行的；因此，现有桩的弯矩和挠度的人工数据是使用三维有限元方法通过对假设情况进行良好校准的数值分析而产生的。所开发的方程是通过使用变换技术对人工数据进行多元线性回归分析而建立的。此外，通过考虑开挖角效应，使用平面应变比参数来表征开挖工作的三维性质。所建立的方程的估计结果可以提供令人满意的桩弯矩和挠度数据，并且比以前的研究结果更准确。