Abstract: In case of using the pipe curtain-structure method to cross existing underground structures, it may be re? quired to excavate soils between pipes with large spacing. During excavation soils between the pipes with large spacing,the deformation pattern of the steel plate cutting process and the prediction of support force are crucial. Based on the proposed steel plate cutting scheme for pipes with large spacing in a practical engineering project, a numerical model is established. A wedge instability model for the square steel plate cutting surface between large spacing pipes is then introduced, and the analytical solution for the ultimate support force of the cutting surface is derived.Further, the influences of various factors on surface settlement and support force are analyzed. The results indicate that: (1) The theoretical calculation method has good applicability to steel plate cutting between large spacing pipes;(2) The cutting size of the steel plate has the greatest impact on surface settlement, while the pipe burial depth has the least impact; (3) As the burial depth increases, the required support pressure for the cutting surface increases,but the rate of increase decreases. Based on these findings, a construction plan of "small cutting, minimal disturbance, and frequent support" is proposed to ensure safe construction.