Abstract: Based on the flexural behavior tests of secant pipe roof structure (SPRS)， finite element models (FEMs) of the SPRS were established using ABAQUS and calibrated based on the laboratory tests. The influences of different parameters on flexural stiffness of SPRS were investigated， and the optimal parameters were given. The results showed that the overlapping distance between the adjacent tubes and the tube diameter interacts with each other in terms of the flexural stiffness. When the ratio of the overlapping distance to the tube diameter is between 0.16 and 0.28， the specimens have better bending resistance. The tube diameter ， the tube thickness and the bar diameter have a linear correlation with the flexural stiffness. The tube diameter has a significant impact on the flexural stiffness of SPRS， followed by the diameter of the reinforcement and the tube thickness.

Key words: underground engineering, secant pipe roof structure(SPRS), flexural stiffness, parameter analysis, ABAQUS