Abstract: With the rapid development of urbanization, the shortcomings of traditional diaphragm wall for deep foundation pit support are gradually emerging. A new supporting structure of wallboard diaphragm wall was proposed, and its structure and working mechanism were expounded. The finite element software MIDAS/GTS was used to study the mechanical characteristics, deformation behavior and the influence of surrounding soil displacement of the new structure during the excavation of foundation pit. The results show that the wallboard diaphragm wall redistributes the internal force by adjusting the thickness and reducing the depth of some walls entering the soil. The main wall and milling plate work in coordination, and the structure is more reasonable. The thickness and spacing of the main wall of this new type of support structure are important factors that affect its stress and displacement, and should be taken seriously in design.

Key words: wallboard diaphragm wall, main wall, milled connection plate, finite element simulation