Analytical Solution for the Deformation of Pipe Galleries Adjacent to Deep Excavation

Abstract

Deep excavations clearly impact adjacent existing properties and threaten their operational safety. Predicting the deformation of existing infrastructure induced by nearby underground construction is the main concern of urban underground development. This paper presents an analytical calculation method for predicting underground pipe gallery deformations induced by adjacent deep excavations. First, the authors assume the existing pipe gallery to be nonexistent in the soil and propose a solution to calculate the excavation-induced vertical movements of the soil at the position of the existing pipe gallery. Thereafter, the authors simplify the existing pipe gallery as an elastic beam on a Winkler foundation to calculate its deformation. Finally, the method is verified by the good agreement found between the calculated result and the field measurement of the construction of the Shanghai Hongqiao CBD project. The proposed analytical method of this work can provide accurate evaluation results for similar engineering projects.

Parametric Study of the Deep Excavation Performance of Underground Pumping Station Based on Numerical Method

“…Several approaches are generally used to conduct deformation analyses of deep excavations: simplified theoretical analyses (e.g., linear-and elastic-based close form approach, beam-spring approach, and limit equilibrium method), empirical/semi-empirical methods [3][4][5][6][7], laboratory tests [8][9][10][11][12], and numerical approaches [13][14][15]. Simplified theoretical methods are generally used to provide some basic understanding of the performance of deep excavations during the design, but they have many limitations because they are oversimplified [16]. Empirical and semi-empirical approaches are used to extrapolate the performance of deep excavations from the analyses of previously reported field data [6].…”