Research On Design And Numerical Simulation Of Deep Foundation Pit Supporting Structure

Deep foundation pit engineering is related to the typical strength,stability and deformation of soil mechanics,and it also relates to the common function of water,soil and supporting structure. Therefore, deep foundation pit engineering is more outstanding than other basic projects,the construction of each stage,the supporting structure system and the external load are changing. As a result,the design scheme of the support structure has a problem,which not only increases the cost of the project,but also endangers the safety of the project. Therefore, the numerical simulation and optimization design of foundation pit support mechanism has important theoretical and practical significance.The main results of this paper are as follows:(1) combined with the existing national and industry standards, based on the summary of the relevant literature,the soil pressure model is analyzed,and the selection of the supporting scheme and the deformation control standards are drawn up.(2) in the shoring system of pile anchor and soil nailing combined,the anchor pile is the main force structure,the upper soil nail wall can meet the requirements of the stability of the upper soil and anchor cable are directly affected by the location of a supporting structure of the force,increasing the prestress of anchor cable to control deformation is very effective,pile stiffness and embedded depth to support the overall stability of the structure is very important.(3) the Lizheng software 6.0 for supporting structure design and calculation,and got the supporting design scheme of deep foundation pit and the displacement and settlement of the design value.(4) combined with the specific engineering examples, the design of deep foundation pit engineering is designed by using the relevant theory,and the numerical analysis is carried out by using FLAC3 D to design the displacement field and stress field of the support system.Combined with the engineering example,the numerical analysis,the standard design theory and the construction practice mutual combination method,has proposed the effective reasonable design method for the deep foundation pit support design.