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(南華大學(xué)城市建設(shè)學(xué)院巖土工程系，衡陽 421001)

［摘要］針對(duì)紅砂巖地區(qū)嵌巖樁的樁-巖界面摩阻特性進(jìn)行現(xiàn)場(chǎng)模型試驗(yàn)，通過在樁身設(shè)置

應(yīng)變計(jì)來測(cè)量樁身軸力和側(cè)摩阻力分布。模型試驗(yàn)研究表明：紅砂巖嵌巖樁在整個(gè)加載過程中表現(xiàn)為端承摩擦樁，破壞模式為突變型破壞；樁側(cè)摩阻力分布模式呈波動(dòng)式的上大下小型分布，大小與施工質(zhì)量有很大關(guān)系；其承載力比按現(xiàn)行規(guī)范計(jì)算的結(jié)果偏大，而且紅砂巖軟化使得承載力和側(cè)摩阻力變小。分析認(rèn)為，短樁側(cè)摩阻力發(fā)揮較充分，并提出紅砂巖嵌巖樁最佳嵌固深度為5倍樁徑。

［關(guān)鍵詞］紅砂巖嵌巖樁；側(cè)摩阻力；模型試驗(yàn)；破壞模式

Model test study on resistance of rock-socketed piles in red-sandstone rock

Xiong Zhibiao, Wang Qiyun, Gu Danping(Geotechnical Engineering Department, School of Urban Construction, University of South China, Hengyang 421001, China)

Abstract:An experimental study was carried on for the shear resistance behavior of rock concrete interface of rock-socketed piles in red-sandstone rock. The axial load and the model of shaft resisitance were monitored by setting strain gauge in piles.The results indicate that the piles socketed in red-sandstone are end-support friction piles with failure mode of saltation in the process of loading, the shaft resistance is diminishing and fluctuating along the rock-socketed piles, and the value is close with construction quality. The bearing capability is bigger than the calulating results according to the present code. Intenerate of red-sandstone rock makes the bearing capability and value of the shaft resistance lower. The shaft resistance of shorter piles is more sufficient. It is presented that the optimal socketed depth of piles is five times of the diameter.

Keywords:rock-socketed piles in red-sandstone rock; shaft resistance of piles; model testing; failure mode

*衡陽市科技局項(xiàng)目“嵌巖樁樁-巖共同作用計(jì)算模型及應(yīng)用”(06KJ10)。

作者簡(jiǎn)介：熊智彪，副教授，碩士生導(dǎo)師，Email