Considering the effects of various factors on inner-bracing stiffness,including the initial deflec-tion,the second-order effect of compression and bending in the inner-bracing,the interaction between the inner-bracing and diaphragm wall,the deformation of diaphragm wall,etc.,an effective stiffness calcula-tion method for the inner-bracing was put forward for diaphragm wall and inner-bracing system.Taking the excavation engineering of a Beijing subway station project as a case study,the excavation process was simulated with ABAQUS finite element software,incorporating both the current standard support stiff-ness and the effective support stiffness.The simulation results were then compared with the measured da-ta.The results show that effective stiffness calculation method for the inner-bracing accords with the real force and deformation state of the foundation pit support system.
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