Numerical Simulation Of Deep Foundation Pit On Redundancy

In deep foundation pit engineering,progressive collapse accidents often occured due to the design of horizontal support.Therefore,this paper applies the redundancy theory to the design of foundation pit engineering to improve the ability of resisting risks.Redundancy design method for deep foundation pit engineering is proposing by using modified mohr-coulomb model.On the basis of the ring beam horizontal support,angular brace and radial brace are study,two schemes of steel tube and concrete are set up,and numerical analysis is carried out by using MIDAS.According to the theory of redundancy in deep foundation pit,the strength redundancy and stiffness redundancy under different material conditions are quantitatively compared by using the method of dismantling components and redundancy calculation formula.Meanwhile,according to the strength redundancy and stiffness redundancy of grid-type horizontal support system,the stress path of the structure is studing and analying,and an optimization scheme of horizontal support considering redundancy is proposed.According to the engineering case,three-dimensional deep foundation pit support structure simulation is establish.Through the redundancy of different construction conditions,the influence of local damage of horizontal support system on itself and adjacent horizontal support is analysis and compare.The influence of local damage of horizontal support system on the whole deep foundation pit is study,and the influence of horizontal support system on the vertical displacement of soil around the pit,the lateral displacement of diaphragm wall and the uplift of foundation pit under different construction conditions is analysis.The results show that reasonable selection of material and horizontal support layout plays an important role in improving the redundancy of foundation pit.It is particularly important to improve the redundancy parameters under the conditions of uniform stiffness and reasonable strength for the overall stability of foundation pit.Redundancy analysis of deep foundation pit engineering design is suggested.