3D Numerical Analysis On Seepage Of Foundation Pit Ex Cavation

To analyze the stability and field measurement accuracy of deep foundation pit underdewatering effect, the steady analysis method in ABAQUS to the deep foundation pitdewatering and excavation with three-dimensional numerical simulation analysis is used. Also,the elastic-plastic model of Drucker-Prager is adopted to verify the deformation of excavationand retaining structure. The water level organon is presented to simulate engineeringdewatering problem, and simulate equivalently to real foundation pit dewatering. This methodcan reduce the calculation cost. Taking metro station deep foundation pit engineering as theresearch object, the numerical simulation results with the measured results is comparedaccording to the field of engineering geology, hydrogeology, metro station retaining structuredesign depth and excavation depth. The primary research content of this paper is as follows:(1) The geotechnical mechanics experimental parameters in deep foundation pit areorganized based on the engineering geology and hydrogeololgy conditions. The parameters areclassified according to the formation change rule, particle size composition, and permeabilityproperties. The accurate geotechnical mechanics parameters is provided for calculation.(2) Two steady dewatering method inside and outside of foundation pit is introduced,and the displacement of foundation pit in different dewatering depth, different initial waterlevel, different permeability coefficient and water level rise are contrasted.(3) The water level organon is presented to analyse the engineering dewatering effect ondeep foundation system and surrounding ground settlement, compare the dewatering and nodewatering numerical simulation results with the measured results and verify the rationalityand reliability of water level organon in engineering calculation.(4) The Multi-Stage excavation deformation process is analyzed by ABAQUS fornumerical simulation about deep foundation pit. The deformation process of deep foundationpit excavation process is monitored. The change rule of foundation, underground wallhorizontal displacement, ground settlement base, upheaval of foundation pit and steel supportaxial force are analyzed.