Numerical Simulation Analysis Of Excavation And Potimizing Of Deep Foundation Pit With FEM ADINA

With the increasing of urban constructions, the optimization design of supporting system of deep foundation pits becomes critically important. The key issue is that due considerations should be taken on both economy and safety for such kind of temporal structures. More attentions have been paid in the past to develop the significant optimization method of simulation and foundation design. In this paper, the present status of development and research on the deep foundation excavation engineering is analyzed systemically, and some problems on FEM used in the deep foundation excavation engineering are also analyzed. So based on solving these problems, the stability of the slope, the deformations and the bending moments of the bracing structure of the deep foundation excavation are studied by using the FEM method of ADINA. It is suggested that some optimization methods of simulation and foundation design were advised.Based on research results of this project, 3-dimensional model of excavating deep foundation pit are introduced. Combined with FEM software ADINA, the deformation regularity of foundation pit wall in length direction and depth direction in excavation process with support and without support are analyzed. Research indicates that the excavation and support of foundation pit is a complex 3-dimsentional spatial issue, which is closely associated with the properties of soil around the pit and support structures. In the excavation and support process of foundation pit, the spatial effect of soil and support structure and soil-structure interaction on foundation pit are evident;Meanwhile, it also indicates that FEM software ADINA method is a powerful for foundation pit engineering. This method should be widely used in geotechnical engineering in the future.Based on research results of this project, 2-dimensional model of excavating deep foundation pit are introduced for optimization design. After changed the nail's length, angle, situation and distance, gain some useful conclusion for optimization design of foundation pit.