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     王  敏
    （福州市建筑設(shè)計(jì)院 350001）

[提要] 通過對(duì)福州地區(qū)最常見的粘土cn)和中砂層兩種持力層上，沉管灌注樁單樁豎向靜載試驗(yàn)的實(shí)測(cè)資料分析及樁側(cè)摩阻力和樁端承載力在試驗(yàn)過程中發(fā)揮的作用，說明目前沉管灌注樁承載力應(yīng)用情況。分析表明打樁施工對(duì)樁周土和樁端土層的擠密作用，提高了樁側(cè)摩阻力及單樁承載力。建議利用擴(kuò)大樁端面積來提高樁的承載力。
[關(guān)鍵詞]  沉管樁 承載力 靜載試驗(yàn) 夯擴(kuò)樁

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