Abstract:For the crown beam under the lateral pressure, the supporting structure of foundation pit will produce the horizontal displacement different from the rigid retaining wall. Especially in the foundation pit with the bracing, the arch phenomenon will produce, which will lead to the redistribution of soil pressure. Therefore, the rectangular uniform load distribution pattern used in the traditional design does not conform to the actual engineering situation. Combined with the field monitoring data and the phenomenon of a deep foundation pit row pile inner bracing supporting project in Wuhan, the change law of the displacement of the crown beam of the inner bracing system is summarized. By using ANSYS finite element software, the numerical simulation of the plane frame of inner bracing is carried out by using the plane integral analysis method. The effect of displacement on the distribution of soil pressure is considered during the calculation. Combined with the field monitoring data and phenomena, the conclusion is that it is relatively reasonable to use the trapezoid distribution form for the design of bracing system, and it is not safe to use the traditional rectangular distribution form for the design. And it is conservative to use the triangular distribution form for the design.