桩端压浆对桩端阻力承载性状的试验研究OA

Postgrouting at the pile tip enhances the perfor-mance of cast-in-place piles.To clarify the performance of tip and side resistances,this study analyzed static load test data from two test piles before and after grouting.Mechanisms underlying an improvement in tip resistance and the influence of postgrouting on side resistance were investigated via theoretical analysis.Finally,a design method for tip resistance control via settlement was pro-posed.Results indicate that the ultimate bearing capacity of piles increases after grouting compared to before,un-derscoring the importance of tip grouting in gravelly soils and its profound impact on load transmission in pile foun-dations.Postgrouting at the pile tip enhances the strength as well as initial stiffness of the bearing stratum,ulti-mately elevating the overall pile foundation-bearing capac-ity.Additionally,tip grouting helps in strengthening over-all side resistance,especially around the pile tip.The grouting procedure has an impact on the soil's arching ef-fect at the pile tip;the extent of the arching effect and an increase in horizontal tension close to the pile tip are posi-tively correlated with the effectiveness of grouting rein-forcement.The design method for tip resistance control via settlement based on measured data statistics was vali-dated using engineering examples,and the method has a practical reference value.