钟闻华  刘松玉  张克恭
    （东南大学交通学院岩土工程研究所  南京 210096）

[提要]  根据现场实测的软岩地基上的嵌岩桩筏基础下桩顶反力和土反力的数据，对群桩基础的受力和变形特性进行系统分析，并利用剪切位移法分析软岩地基上的嵌岩桩与桩周土之间的相互作用和共同承担上部结构荷载的问题。最终得出结论，软岩地基上嵌岩桩基础与一般的摩擦桩相似，桩周土可以承担一部分上部结构荷载；另一方面，计算结果显示剪切位移法同样适用于嵌岩桩基础的分析。因此，建议在设计嵌岩桩基础时，应充分利用桩周土的承载力，使设计更加经济。
[关键词]  剪切位移法  软岩地基  嵌岩桩基础

This paper, utilizing the shear displacement method, analyzes the interaction between the piles socketed in weak rock and the surrounding soil, and studies the proportion of superstructure loads shared by piles and ground respectively. Based on the pile head force, the soil reaction and the settlement of foundation collected in-situ, the systemic analysis is carried out.lt can be concluded that, similar to friction pile group,the soil around the piles shoulders the loads together with the piles. The comparison between computed results and measured data shows that the refined load-transfer is suitable to analyze the pile group embedded in weak rock. Considering the surrounding soil, we can design the pile foundation economlc.
Keywords: shear displacement method; soft soil; pile group; weak rock; socketed pile