STUDY ON GEOLOGICAL DEFORMATION LAW OF DEEP FOUNDATION PIT ENGINEERING BASED ON FINITE ELEMENT ANALYSIS

The premise of safe construction of foundation pit is to control the deformation of deep foundation pit engineering. It is necessary to ensure the stability of foundation pit retaining structure, and the influence of foundation pit excavation on the surrounding environment should also be considered. In this paper, the deformation law of typical deep foundation pit engineering geology in Changchun North Lake New Area is analyzed based on the deformation mechanism and law of deep foundation pit. Taking the A square project in this area as an example, the design parameters are optimized by using MIDAS GTS NX finite element software. The experimental results show that with the increase of the excavation depth of the foundation pit, the horizontal displacement of the top of the support structure increases, showing a linear deformation law. The deep horizontal displacement of the foundation pit support structure is positively correlated with the excavation depth. The deformation of the support structure presents an "bow" curve. The maximum position of surface settlement is 12m away from the foundation pit. With the increase of the excavation depth of the foundation pit, the surface settlement curve changes in a "concave" shape. The curve change law in the finite element simulation results tends to be the same as the actual monitoring results.