Study On Deformation And Optimize The Design Of The Combination Of Soil And Rockexcavation

Simulated a deep foundation pit of a subway station in Wuhan using Flac3D. Through the comparison of monitoring data and numerical results, studying a combination of soil and rock excavation deformation law and its influencing factors, further exploring the type pit structural optimization and design methods.(1)A brief overview of the status of deep foundation engineering, including numerical simulation techniques, surveillance techniques, neighboring loads and structural optimization design, the elastic foundation beam method and the methods of stability checking.(2)Based on literature review, advanced ideas of this paper. Combined with monitoring of the combination of soil and rock excavation, using the solid element simulation simulate the soil pile and crown beams, etc. Computational model size is104m x96.2m x30m, more consistent with the numerical results and the typical on-site monitoring data law, there are some differences in value, this is because the numerical simulation can not fully consider the site conditions.(3)Pit excavation in accordance with the design and excavation in accordance with the cantilever support, these two different excavation, excavation of the deformation characteristics and law, taking into account the vehicle load and construction heap load of excavation, and come to different factors influence the degree of deformation of the foundation pit.(4)Based on the combination of soil and rock pit deformation law the recommendations of the program selection, and a model of the hierarchical design optimization parameters to optimize the design through the layered, you can adjust the design parameters in the overall design, to achieve control the deformation of the upper, the lower control stabilization purposes; hierarchical design engineering for the huge gap between the top and bottom of the soil and rock parameters, there are good economic and practical significance.