English：

Based on a deep and large foundation excavation project in Dongguan City, this paper employed numerical simulation methods to investigate the deformation patterns of multirow pile retaining structures. It analyzed the effects of structural configurations and row spacing on displacement control and validated the findings using field measurement data. The results indicate that stepped multirow piles exhibit excellent lateral displacement resistance, with pile body deformation showing a distribution pattern of “greater at the top and smaller at the bottom,” and the largest displacement occurring near the pile cap. In nonstepped multirow pile systems, displacements in each row were relatively large. Under identical loading conditions, the maximum horizontal displacement of the pile shaft in the nonstepped system was 3857mm, compared to 1368mm in the stepped system, representing an approximately 64% increase in the nonstepped system. The maximum horizontal displacement of the pile body gradually decreases with increasing row spacing, but the rate of decrease slows as the row spacing increases. The numerical simulation results are generally consistent with the measured data, demonstrating that the numerical simulation method can effectively predict the deformation patterns of multirow pile retaining structures.