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首页> 外文会议>The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)论文集 >In-situ Monitoring and Safety Analysis of Deep Foundation Pit Support Engineering
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In-situ Monitoring and Safety Analysis of Deep Foundation Pit Support Engineering

机译：深基坑支护工程现场监测与安全分析

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摘要

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 isn't large with a little fluctuation, while the axial forces of lower strut increase with the excavation depth increases.
机译：针对某地铁车站开挖深度接近30 m的深基坑支护工程，制定了监测方案，提出了一种通过控制支桩位移和支杆轴向力来确保施工安全的双重控制方法。建议，然后确定相应的控制基准。通过现场监测与有限元数值分析相结合，研究了支撑桩的水平位移和支杆轴向力的变化规律。数值分析结果与试验结果基本吻合，证明了计算模型和参数的可靠性。结果表明：（1）试验最大位移小于控制值0.13％H，支柱轴向力安全系数大于1.2，表明基坑施工安全。 （2）对于同一个支杆支撑的两个相应的支护桩，水平位移的发展趋势是一致的，对于相同的开挖深度，最大水平位移的差值基本上小于25％; （3）在开挖深度小于10m的情况下，支撑桩的水平位移在桩的上部最大，沿桩体减小。随着开挖深度的增加，水平位移的最大值出现在桩的中下部。（4）在施工过程中，上部支杆的轴向力变化不大，波动很小，而轴向力随着开挖深度的增加，下部支撑的数量也随之增加。

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