中文摘要：

通过模型试验和现场测试，对桩侧土和桩端土在荷载传递过程中的相互强化作用进行了研究，并对这种相互强化作用机理进行了深入的理论分析。研究发现：不但桩端土的强度对桩侧土的极限摩阻力的发挥具有强化作用，同样，桩侧土的强度对桩端的极限端阻力的发挥也具有强化作用。

英文摘要：

Model experiment and on-site test have been done in this paper to study the strengthening interaction between pile-end soils and pile-surrounding soils in load transferring. And further theoretical analysis of such strengthening interaction is made. This paper proves the strengthening effect of pile-end soils＇ strength on ultimate lateral resistance of pile, and meanwhile,pile-end soils＇ strength can also be improved by pile lateral friction resistance. The study result is very important and meaningful for guiding the pile design as well as construction in engineering practice.