Research on Horizontal Displacement and Pile Side Frost Heave Force of Overwintering Foundation Pit Support Structure
With the development of underground space,construction need to be carried out in a relatively cold en-vironments if necessary,and the construction of foundation pit may overwinter,in order to study the horizontal displacement and pile side frost heave force of the overwintering foundation pit support structure,three-dimen-sional fast Lagrangian numerical analysis software(FLAC3D)was used to analyze the pile side frost heave force and horizontal displacement of the overwintering deep foundation pit support structure with different pile diame-ters and insertion ratios under the cantilever pile support form.Analysis shows that under frozen conditions,the peak horizontal displacement of the cantilever pile support foundation pit is 4.5 times that at room temperature,and the peak frost heave force on the pile side increases by 2 times,the frost heave effect has a significant im-pact on the deformation and stress of the foundation pit,as the pile diameter increases,the frost heave force on the pile side rapidly increases while the peak horizontal displacement continuously decreases,and the horizontal displacement of the pile and the frost heave force on the pile side are minimally affected by changes in the inser-tion ratio.The results can provide theoretical reference for the design and construction of row pile support forms mainly composed of cantilever piles in winter deep foundation pit engineering.
FLAC3Doverwintering foundation pitfrost heavingnumerical simulation
NETL
NSTL
万方数据
