Based On Space Effect Theory To Long-wide-deep Foundation Pit Support Optimization Technology Research

In this paper, TengWangGe tunnel project of the nanchang city along the river north roadand centre road connecting project as the background, in the understanding of miscellaneousfill all the basic parameter at the same time, through FLAC3Dto support foundation pit inpreliminary design and optimization design of space effect to carry on the analysis, and thefoundation pit excavation and comprehensive rolling method section excavation twoexcavation method for numerical simulation analysis, the final use of field monitoring dataresults and numerical simulation results are compared and analyzed. The main research workis as follows:First of all, through the field test and laboratory experiment method mainly understandmiscellaneous fill in the foundation pit excavation and other various soil physical properties,and through the field precipitation test and indoor penetration test, measure the permeabilitycoefficient of soil foundation pit excavation, numerical simulation for below providesaccurate powerful basis.Secondly, by using finite element software FLAC3Dto foundation pit supporting inpreliminary design and optimization design case soil space effect on numerical simulationresearch, determine the foundation pit model grid established rationality, retaining systemsimulation and parameter selection and foundation pit soil parameter selection and correctnessof the foundation pit precipitation simulation and construction condition meticulous division.Again, in the front of the model based on a moderate amount of modified, theneighboring buildings in an all-round way of the foundation pit excavation and rolling methodsection excavation two excavation method for numerical simulation, through the contrastanalysis method to understand the deformation of the foundation pit soil, and makecorresponding judgment.Finally, in this paper, the foundation pit engineering site monitoring information, andanalyzes the characteristics of deformation of the foundation pit soil area. At the same timethrough the field monitoring data results, and numerical simulation analysis and contrast,through the analysis results whether can use the3d finite difference method in deepfoundation pit deformation numerical simulation analysis. This paper through the numerical simulation research, the future foundation pitdeformation research played a better reference role, and foundation pit simulation parametersof rational selection and construction condition of meticulous division is to ensure that the keyto numerical simulation accurate analysis.