The Steel Support Performance Study Of Deep Foundation Supporting Structure With Row Piles

As the top and tall building, the development and utilization of urban underground space and rail transit project is increasing,deep foundation pit engineering projects have become more frequent, reinforced concrete pile with support of supporting system in the steel structure is a common method in deep foundation pit supporting, row piles and steel support interact, work together, so as to ensure the stability of foundation. In this paper, exampled by a certain foundation pit engineering of nanning region as the background, using ANSYS software to build a three-dimensional finite element model of the soil, row piles and steel support interactions, analyzing the bearing capacity of the steel support and the stability of foundation pit on the basis of theoretical analysis and numerical simulation.From the stability capacity analysis of a single span and multi-span continuous bar, calculating ultimate bearing capacity of the longitudinal support,lateral support, corner support; and then exploring the bend by weight effect on axial force and deformation of steel support; analyzing the change of steel support axial forces in the course of construction, the steel support axial force reaches a maximum after the completion of excavation, it is a dangerous point of the foundation pit at the last step excavation; exploring the impact of lattice column depth into the pile for axial forces and deformation of steel support in the deep foundation, the main role of increasing the lattice type steel columns into the depth of the pile between 0.5～2.0 m is to limit the vertical deformation of longitudinal support and lateral support,but lattice steel column has little impact on the steel support axial force; when the steel support is caused by the joint action of Initial eccentricity and gravity,the calculation formula of bearing capacity is deduced,and studying the initial eccentricity and gravity bending caused by interaction effect on the bearing capacity of steel support; analyzing the support level spacing,support temperature influence on steel support axial forces of the longitudinal support,lateral support, corner support; the article also studies the support level spacing, support additive axial force influence on retaining structure internal force, deformation and the deformation of foundation pit surface effects.