Analysis Of Influence Of Irregular Supporting Force In Excavation Of Deep Foundation Pit

With the accelerated process of urbanization,deep excavation is constantly emerging.However,the excavation process of deep excavation is very complicated and involves many factors.The internal support in deep excavation can resist the deformation of the supporting structure of excavation,and it is very important to ensure the overall stability of the excavation.The process of the excavation process in the supporting stress change rule research is not deep enough,this paper takes Wuhan a square of deep excavation project as the basis,using finite element software midas-GTS,the supporting structure internal force variation and influencing factors in the research process of deep excavation,so as to provide a good reference for the design,construction and monitoring.The main steps are as follows:(1)Base on the three-dimensional modeling of the deep excavation in a square in Wuhan,the results of the supported finite element are obtained.In the four layer of the supporting plane,slecting symmetric region,symmetry of the supporting gusset region,asymmetric gusset region asymmetric with a representative study of support for the support area.By analyzing the results of the model,the changes regularity of support can be obtained.(2)The support axis force is calculated by the classical mechanics method and the incremental method in the software of the deep foundation pit.The calculation results are compared with the peak value of the monitoring data,and the same points and different points are summed up,and the reasons are analyzed.(3)The representative support of symmetric bracing area,symmetric bracing area,asymmetric brace area and asymmetric bracing area are selected respectively,and the finite element results of axial force are compared with the actual monitoring data.Summarize the differences and similarities between them,and analyze the reasons,further verify the correctness of the model.(4)Base on the finite element analysis software midas-GTS,the project can be set up in the unsymmetrical bracing area with plate brace and plate bracing.The specific effect of the support on the supporting axis in the asymmetric bracing area can be obtained after comparing and analyzing the data of supporting axial force of the asymmetric bracing area from two schemes.(5)Using the finite element analysis software midas-GTS to change the design parameters of a deep foundation pit of a square in Wuhan to get the The changes of the axial force,bending moment and shear results of the support under different parameters,covers the thickness of the diaphragm wall,the concrete grade of the diaphragm wall,the embedded depth of the diaphragm wall and the dimension of the supporting section,the specific effects of changing the parameters can be summarized by analyzing the data.