王  敏
    （福州市建筑设计院 350001）

[提要] 通过对福州地区最常见的粘土cn)和中砂层两种持力层上，沉管灌注桩单桩竖向静载试验的实测资料分析及桩侧摩阻力和桩端承载力在试验过程中发挥的作用，说明目前沉管灌注桩承载力应用情况。分析表明打桩施工对桩周土和桩端土层的挤密作用，提高了桩侧摩阻力及单桩承载力。建议利用扩大桩端面积来提高桩的承载力。
[关键词]  沉管桩 承载力 静载试验 夯扩桩

Based on the in-situ data analysis of the pile static load test, the current application of driven in-situ pile, which rests on the clay( lI) stratum or medium sand stratum as the bearing stratum in the region of Fuzhou, is stated by the study of mechanical mechanism of skin friction and end bearing of pile. The compactive effect of the surrounding and underlying soils due to the construction of pile foundation enhances the pile-bearing capacity through enhancing the skin friction. On the other hand, the author proposes to enlarge the area of pile tip to enhance the pile-bearing capacity and to popularize it with the advantages of driven in-situ pile.
Keywords: driven in-situ pile; bearing capacity; pile static load test; compacted base一enlarged pile