English：

Taking the deep and large foundation excavation of Kunming Comprehensive TransportationInternational Hub as the engineering background, the deformation characteristics, column deformationand support axial force changes of the surrounding environment of the construction foundation excavationin Kunming soft soil layer are analyzed. The deformation of each measuring point increases gradually withthe increase of excavation depth, and the maximum deformation occurs at the top of the foundationexcavation, and the overall deformation shape is “ open”. The deformation of diaphragm wall increaseswith the increase of excavation depth. At first, the deformation increases slowly, and then suddenlyincreases sharply. The vertical settlement of the column is caused by supporting and sealing the load ofvehicles on the board and the yard. The maximum axial force of the support is basically matched with thedistribution pattern of the maximum lateral deformation of the enclosure. The variation range of water levelin each observation well is small. There is water leakage in the area near tower B on the east side of thefoundation excavation, and the water level changes greatly. With the gradual excavation of the foundationexcavation in the subsequent working conditions in each area, the deformation of the station graduallyincreases, but the deformation is small and the deformation in the interval has not changed greatly.