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| Analysis and Research on Impact of Foundation Pit Rebound in Soft Soil Area on Engineering Pile |
| SUN Jun － ling |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China |
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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．
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Received: 01 August 2011
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2011, Vol. 28 
