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    鐘聞華  劉松玉  張克恭
    （東南大學(xué)交通學(xué)院巖土工程研究所  南京 210096）

[提要]  根據(jù)現(xiàn)場(chǎng)實(shí)測(cè)的軟巖地基上的嵌巖樁筏基礎(chǔ)下樁頂反力和土反力的數(shù)據(jù)，對(duì)群樁基礎(chǔ)的受力和變形特性進(jìn)行系統(tǒng)分析，并利用剪切位移法分析軟巖地基上的嵌巖樁與樁周土之間的相互作用和共同承擔(dān)上部結(jié)構(gòu)荷載的問題。最終得出結(jié)論，軟巖地基上嵌巖樁基礎(chǔ)與一般的摩擦樁相似，樁周土可以承擔(dān)一部分上部結(jié)構(gòu)荷載；另一方面，計(jì)算結(jié)果顯示剪切位移法同樣適用于嵌巖樁基礎(chǔ)的分析。因此，建議在設(shè)計(jì)嵌巖樁基礎(chǔ)時(shí)，應(yīng)充分利用樁周土的承載力，使設(shè)計(jì)更加經(jīng)濟(jì)。
[關(guān)鍵詞]  剪切位移法  軟巖地基  嵌巖樁基礎(chǔ)

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