Research on Composite Post-Grouting Bored Pile Load-Bearing Characteristics
Composite post-grouting is a pile bottom grouting method that combines open and closed grouting.The open grouting pipe is reserved,the closed capsule is divided into two parts,and a circular hole is reserved in the middle of the steel plate to form an enlarged head at the pile end to improve the bearing capacity of the foundation pile.This paper is based on the static load test results of three test piles of the No.2 bridge project of Xilingjing hub main line of the G2003 Ring Expressway in Taiyuan,Shanxi,through the comprehensive analysis of the ultimate bearing capacity of the foundation pile,the axial force of the pile shaft and the pile end resistance,the results show that the load sharing ratio of the end resistance is17.0%～44.5%,and the measured values of each side resistance and end resistance are greater than the recommended values of relevant parameters in the composite post-grouting calculation formula.The engineering effect of composite post-grouting cast-in-place pile is verified,which can provide some reference for other projects of composite post-grouting cast-in-place pile.
composite post-groutingbored pileloading testpile tip resistancebearing characteristics
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