Bearing Characteristics of Pile-end Post-grouting Pile of Xi'an Xianyang International Airport Expressway Bridge
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Abstract:
Two different techniques, pile-end post-grouting technology of bored piles and conventional cast-in-place piles, were used to conduct the in-situ static loading tests on the pile foundation of the Weihe Bridge K3+966.50 of Xi'an Xianyang International Airport Expressway. The measured data were used to analyze the interaction between the pile and soil of each pile under different loadings , the enhanced mechanism of technique, and the bearing characteristics of the two different techniques. The research results showed that the vertical ultimate bearing capacity of the pile-end post-grouting piles increases by at least 40% and the settlement decreases by about 25mm compared with that of the non-grouting piles, which suggested that the pile-end post-grouting technology can increase the bearing capacity and stability of pile foundation significantly. This paper proposed a calculation formula of the ultimate bearing capacity of a post-grouting single pile based on the observed data and grouting mechanism of pile-end post-grouting, which can provide valuable references for the pile foundation design in similar areas.
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