English：

Aiming at the deformation stability of diaphragm walls in deep foundation excavationengineering, based on a deep foundation excavation engineering of the Huanyuan Middle Road parking lotof Xi’an Metro Line 8, a three⁃dimensional numerical model was established by using PLAXIS 3D finiteelement software, and the influence of different structural modeling methods and support designs on thedeformation characteristics of diaphragm walls was systematically analyzed. By comparing the differencebetween the solid element and the plate element to simulate the diaphragm wall, the role of the inclinedsupport setting and the cement mixing pile at the bottom of the foundation excavation in the supportsystem is discussed. The results indicate that the simulation of diaphragm walls by solid elements canreflect its actual deformation form more accurately, which is in good agreement with the monitoring data.Although the plate element model has high computational efficiency, it will overestimate the walldisplacement, and the result is conservative. The diagonal brace can significantly improve the overallstiffness of the support system, reduce the horizontal displacement of the wall by 20% ~ 30%, andeffectively inhibit the “bulging” deformation. The mixing pile at the bottom of the foundation excavationworks together with the diaphragm wall to provide the bottom embedding effect and significantly reducethe deep⁃seated “kick⁃in” displacement.