Research On Time-space Effect Of Deformation Of Deep And Large Foundation Pit

Since the reform and opening up,China’s urban construction has increased rapidly,as has been the case in the vast southwest region.At present,the two-dimensional analysis method used in deep foundation pit design has encountered bottlenecks,and it is necessary to perform three-dimensional analysis and calculation of the foundation pit engineering.In this paper,the three-dimensional finite element analysis of the Nash spring city foundation pit project in Dali City and the actual engineering monitoring data are used to study in detail the spatial effects of the deformation and deformation law of the deep foundation pit support,the positive corner effect and the negative corner effect.Degree.Through analysis and research,this method can better reflect the actual situation,indicating that the article method has a good applicability to the geological engineering situation in the region.And through the simulation analysis of the foundation pit with different angles of the sun corners and the different angstrom size foundation pits,the following results have been obtained:(1)The spatial position stability conditions are as follows: inside corner> side wall>outside corner,and so does the deformation growth rate.(2)During the period from the middle to the end of the excavation,distinct displacements began to occur at different locations.This is consistent with the actual situation,and this can also explain the correctness of the method.(3)When the sun angle is located in the middle of the side wall of the foundation pit,the sunken point has the largest displacement regardless of the size of the sunken corner and is the most unstable zone.(4)From the angles of the unstable factors of the positive angle in the side wall of the positive angle,away from the side wall of the angle of the sun,and the angle of the sun,the angle of the sun corner and the sun corner is the most affected by the sun angle.The location is affected by the yang angle,and the side wall of the far positive angle is the least affected.