Study on Deformation Model of Secant Boring Pile in Foundation Pits

钻孔咬合桩是一种新颖的基坑挡土墙型式，其变形破坏过程及模式对于基坑挡墙的设计和施工至关重要。本文将安定理论引入咬合桩的变形破坏分析，根据安定理论的几种变形行为，对基坑围护钻孔咬合桩的变形破坏模式进行探讨，提出了钻孔咬合桩逐渐变形直至破坏的5种模式，从一个崭新的角度对咬合桩受力变形机理进行研究，为咬合桩基坑支护工程的设计及施工提供参考依据。 The secant boring pile is a new type of retaining wall, and the process of its deformation and failure mode is important to the design and construction of retaining wall. This paper introduces shakedown theory into the analysis of deformation and failure of a secant boring pile. In terms of the several deformation behaviors of shakedown theory, deformation and failure of a secant boring pile in foundation pit retaining are addressed and five modes concerning the secant boring pile from gradual deformation to failure are established. This provides a new path to approach the deformation mechanism of a secant boring pile when subjected to loads. The achievement is of significant value in the design and construction of the foundation pit reinforcement through the secant boring pile.