(南华大学城市建设学院岩土工程系，衡阳 421001)

［摘要］针对红砂岩地区嵌岩桩的桩-岩界面摩阻特性进行现场模型试验，通过在桩身设置

应变计来测量桩身轴力和侧摩阻力分布。模型试验研究表明：红砂岩嵌岩桩在整个加载过程中表现为端承摩擦桩，破坏模式为突变型破坏；桩侧摩阻力分布模式呈波动式的上大下小型分布，大小与施工质量有很大关系；其承载力比按现行规范计算的结果偏大，而且红砂岩软化使得承载力和侧摩阻力变小。分析认为，短桩侧摩阻力发挥较充分，并提出红砂岩嵌岩桩最佳嵌固深度为5倍桩径。

［关键词］红砂岩嵌岩桩；侧摩阻力；模型试验；破坏模式

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

*衡阳市科技局项目“嵌岩桩桩-岩共同作用计算模型及应用”(06KJ10)。

作者简介：熊智彪，副教授，硕士生导师，Email