In-situ Monitoring and Safety Analysis of Deep Foundation Pit Support Engineering
Aimed at a deep foundation pit support engineering in a metro station construction with excavation depth nearing 30 m, a monitoring plan was made, a double-control method ensuring the construction safety by controlling both the displacements of supporting piles and the axial forces of strut was suggested, and the corresponding controlling benchmark was thereby determined. The changing law of horizontal displacements of supporting piles and axial forces of struts had been studied by in-situ monitoring integrated with FEM numerical analysis. Numerical analysis results are basically consistent with the tested results, which prove the reliability of the calculation model and parameters. The results are shown as follows: (1) the tested maximum displacement is less than its controlling value 0.13％H, safety factor of the axial force of the strut is over 1.2, which means the pit is safe during construction; (2) for two corresponding supporting piles braced by the same strut, the development trend of horizontal displacement is consistent, and the differences of maximal horizontal displacement are basically less than 25％ to the same excavation depth; (3) the horizontal displacements of supporting piles show the biggest at upper part of the piles and reduces along the pile body, given the excavation depth is less than 10m; with the excavation depth increases, the maximum of horizontal displacement appears at the middle or lower part of the piles.(4) during the construction process, the axial forces change of upper strut isnt large with a little fluctuation, while the axial forces of lower strut increase with the excavation depth increases.
deep foundation pit supporting pile horizontal displacement axial force of strut in-situ monitoring FEM analysis
WEI Limin HE Qun ZHANG Chunshun
School of Civil Engineering and Architecture,Central South University,Changsha 410075,Hunan,China
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
379-385
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）