This paper presents the results of field tests performed to investigate the bearing capacity of Drilling with a prestressed concrete (DPC) pipe pile under different end sealing and side grouting conditions. The High Strain Dynamic Testing (HSDT) was conducted to evaluate the bearing characteristics of full-scale DPC pipe piles. Moreover, base resistance theoretical formula considering end sealing effect and shaft resistance theoretical formula considering side grouting effect are presented. The theoretical results were compared with the recommended values of specification for traditional pipe piles and tested values to demonstrate the rationality of theoretical formulas and the superiority of end sealing and side grouting. Furthermore, the effects of sediment under the sealing concrete and grouting conditions on the bearing capacity of a single pile were discussed in detail to reveal the influencing mechanisms of end sealing and side grouting. The result showed that the presented base resistance theoretical formulas can estimate the effect of end sealing on the ultimate base resistance of DPC pipe piles with good accuracy. For 1 m pipe piles, end sealing increases the base resistance by up to 103.5% at most compared to unsealing pipe piles; total shaft resistance of piles with double or multi-pipe grouting is more than 37% higher than the recommended maximum value of traditional pipe piles in the pile foundation specification. In addition, the base resistance was significantly affected by the sediment thickness under the sealing concrete. The hole wall time-dependent deformation caused by drilling and unloading affected the side grouting significantly.

本文介绍了现场试验的结果，以研究不同端部密封和侧面灌浆条件下预应力混凝土（DPC）管桩钻孔的承载能力。高应变动态测试 (HSDT) 旨在评估全尺寸 DPC 管桩的承载特性。并给出了考虑端封效应的基础阻力理论公式和考虑侧向注浆效应的轴阻力理论公式。将理论结果与传统管桩规范推荐值和试验值进行比较，论证了理论公式的合理性和端封侧注浆的优越性。此外，详细讨论了止水混凝土和注浆条件下的泥沙对单桩承载力的影响，揭示了端部止水和侧面注浆的影响机制。结果表明，提出的基础阻力理论公式可以很好地估算端部密封对DPC管桩极限基础阻力的影响。对于1m管桩，端部封孔相比未封孔管桩，基础阻力最多增加103.5%；双管或多管注浆桩的总轴阻比桩基础规范中传统管桩推荐最大值高出37%以上。此外，基础阻力受密封混凝土下沉积物厚度的显着影响。