Analysis Of Transfer Mechanism And Numerical Simulation Of Foundation Pit Anchor Axial Force

ABSTRACT:In recent years, along with the country to vigorously promote the new urbanization, which makes the city population is more and more and the city space is smaller than before. In order to expand the space cannot be blindly increasing the urban area of the city. so the utilization of urban underground space is growing rapidly. With the development of urban underground space, which prompts the development of deep foundation pit excavation and supporting technology to new heights. The rapid development of deep foundation pit to a considerable extent promotes the development and utilization of underground space, but there are various problems in the course of excavation and supporting of deep foundation pit. Monitoring of foundation pit anchor axial force and transfer changes are important parts in foundation pit supporting.Studing on this topic has a certain theoretical significance and has the important practical value for engineering practice. the main research content of this paper is as follows:(1)Based on Mindlin problem displacement solution Kelvin problem displacement solution and Hyperbolic function model derive the3kinds of bolt axial force transfer formula. Discusses the various parameters on the influence of bolt axial force transfer and has carried on the analysis and the comparison to3kind of models.(2)Research and analyze various soil pressure、distribution and action mechanism on retaining structure of foundation pit. Besides, about the influence factors of soil pressure on retaining structure and calculation method of soil pressure present a comprehensive exposition and research on the relationship between soil soil pressure and pit anchor axial force、the calculation method of foundation pit anchor axial force.(3)According to the engineering example tests of bolt axial force in the field. The use of less practical engineering method and test in the process of steel bar gauge installed on the free segment of anchor segment length, in order to precise analyze law of bolt axial force transmission and as a guidance for design and construction.(4)By using the finite-difference software FLAC3D, establish a three-dimensional finite element model of deep foundation pit excavation according to the engineering example to study axial force of anchor in excavation process variation. And analysis of the influence of pile spacing、pile diameter、spacing of foundation pit anchor transfer law of axial force of bolt.