ABSTRACT
To study the influence of unbalanced surcharge on the retaining structure of pit excavation, the finite element software PLAXIS is used to simulate the process of pit excavation under unbalanced surcharge. The results indicate that under the condition of unbalanced stacking on both sides of the outer pit, the displacements of the connecting walls on the left and right sides of the outer pit and the cast-in-place piles in the inner pit are quite different, and its structural parameters need to be considered separately when designing the enclosure structure. At the same time, under different overload combinations of the outer pit, the maximum value of the bending moment of the connecting wall on the left and right sides of the outer pit is basically the same. The bending moments of the cast-in-place piles on the left and right sides of the inner pit are basically the same, the bending moment remains basically unchanged with the increase of overload, and the position when the maximum bending moment occurs is basically the same. And through the comparison of different working conditions, some basic laws are summarized, and helpful opinions are put forward for the design of the pit-in-pit enclosure under the condition of unbalanced stacking.
