Analysis of the influence of solidified slurry buttress support on the deformation of soil outside the pit

To effectively solve the two major problems of controlling engineering waste generation and foundation pit deformation, this research proposes to improve the engineering waste mud and use it in the buttress wall of the buttress foundation pit support structure. The three-dimensional model was established by using PLAXIS 3D finite element software. The reliability of the model was verified and the difference of soil deformation outside the pit under the action of slurry buttress was compared and analyzed. The calculation results show that the constitutive model can better reflect the deformation of the soil outside the pit. Compared with no slurry buttress, the pre-buried slurry buttress wall can pre-suppress the adverse deformation of the surface soil outside the pit. Under the most dangerous working conditions, the surface settlement can be reduced by 73.3%, and the horizontal displacement of the surface can be reduced by 66.4%. The embedded buttress wall has little effect on the deformation trend of deep soil outside the pit, but it can effectively control the deformation of deep soil outside the pit and reduce the area affected by adverse deformation. The embedded slurry buttress wall can not only constrain the maximum angular strain and tensile strain generated by the deformation of the soil outside the pit, but also reduce the influence range of angular strain and tensile strain, thus reducing the damage of angular strain and tensile strain to the existing buildings near the pit to a certain extent.