软土地区基坑回弹对工程桩的影响分析研究

孙俊岭

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铁道工程学报 ›› 2011, Vol. 28 ›› Issue (10) : 46-52.

路网研究

软土地区基坑回弹对工程桩的影响分析研究

孙俊岭

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Analysis and Research on Impact of Foundation Pit Rebound in Soft Soil Area on Engineering Pile

SUN Jun － ling

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文章历史 +

摘要

研究目的：软土地区深基坑中的工程桩，如在设计中没有充分考虑基坑卸载回弹引起的桩身拉力影响时可能会导致桩身断裂的严重事故。通过本文的研究，认真分析深基坑开挖对桩身内力、变形及极限承载力的影响，提出软土地区考虑基坑回弹影响的桩基的设计方法，确保工程安全。

研究结论: 本文采用MIDAS /GTS 软件对虹桥综合交通枢纽工程的试桩及深基坑中的工程桩进行了有限元模拟分析，并与试桩结果及工程桩回弹监测结果进行了对比分析。提出了在分析基坑回弹对深基坑中桩基的影响时桩土摩擦界面参数的确定方法; 提出了在软土地区的深基坑中桩设计时考虑基坑回弹影响的设计原则、方法与相关建议; 探讨了基坑回弹对桩抗拔承载力的影响。

Abstract

Research purposes: The engineering pile of deep foundation pit in soft soil area may break if the pulling force of pile caused by the unloading rebound of the foundation pit is not fully considered in the design． This paper analyzes the the impact of the deep foundation pit excavation on the internal force，deformation and limit load －bearing capacity of the pile and offers the design method of the pile foundation in soft soil area on consideration of the rebound impact of foundation pit for ensuring the construction safety．

Research conclusions: The finite element analysis was made to the test piles of the Hongqiao comprehensive transportation terminal project and piles of deep foundation pit with the MIDAS /GTS software，and the comparative analysis was made among the analysis results，the test pile result and the monitoring result of engineering pile rebound． The method was offered for determining the frictional interface parameters of the pile － soil when the analyzing the impact of the foundation pit rebound on the pile foundation in deep foundation pit． The principle，method and the relative suggestions were presented for design of the pile in the deep foundation pit on considering of the rebound impact of the foundation pit． The discussion was made on the impact of the foundation pit rebound on the uplift bearing capacity of the pile．

导出引用

孙俊岭. 软土地区基坑回弹对工程桩的影响分析研究[J]. 铁道工程学报, 2011, 28(10): 46-52

SUN Jun － ling. Analysis and Research on Impact of Foundation Pit Rebound in Soft Soil Area on Engineering Pile[J]. Journal of Railway Engineering Society, 2011, 28(10): 46-52

中图分类号： TU473

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