An Improved Calculation Method for the Factor of Safety and Its Application to the Stability Analysis of Deep Foundation Pits in Red Clay

摘要

The changing characteristics of shear strength parameters of red clay were analysed to consider the impact of stress path on soil strength by a true triaxial experiment which simulated the excavation process of a deep foundation pit. The methods were proposed to determine the reduction factors applicable to the soil strength and calculate the safety factors; the safety factors at different excavation depths were then back-calculated. This provided a more efficient way to assess the stability of deep foundations and to determine safe depths of excavation.