关键词: 门架式双排桩, 深基坑, 耦合分析, 弯矩, 侧向位移

Abstract: The double-row pile supporting structure has been widely used in deep excavations, but current theoretical models for the load bearing and the deformation estimations have limitations in addressing the real-world engineering challenges. This study focuses on the double-row pile frame system and combines the FLAC^3D and the PFC^3D to create a continuous-discrete coupled analytical model. By incorporating both the double-row pile system and the surrounding soil, information is exchanged between the continuous and discrete media using PFC^3D wall elements. Numerical simulations are performed to evaluate the stress and deformation characteristics. Results from the literatures show that the proposed method effectively captures the stress and deformation of double-row pile frame system, addressing the issue of rear pile bottom ‘kicking’ often observed with the standard design specifications and following the load transfer path of the system. With the increasing use of innovative double-row pile supporting structures in practical applications, this method proves to be of significant practical value. 

Key words: Double-Row Pile Frame, Deep Excavations, Coupled Analysis, Bending Moment, Lateral Displacement