Abstract
In the excavation engineering, the bracing stiffness is an important parameter reflecting the supporting performance of the inner bracing system. Bracing stiffness has great influence on the deformation of the retaining structure and the foundation pit, and its calculation method is the theoretical basis for the design and deformation analysis of the foundation pit. The limit equilibrium method, subgrade reaction method and finite element method used in the design, stability and deformation analysis are introduced in detail. Different calculation models and calculation methods of bracing stiffness are summarized in detail in each analysis method. The method of providing foundation pit retaining design standard and the optimization method proposed by scholars are introduced and analyzed in depth. It is suggested that the subsequent research should further establish a support stiffness calculation method taking influence of important parameters such as the difference of support stiffness and uneven support spacing.
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