大直径现浇薄壁筒桩单桩内摩阻力研究及竖向承载力模拟  

Study on Inner Friction and Vertical Bearing Capacity Simulation of Single Thin-wall Cast-in-situ Tubular Pile

作　　者：周建[1] 刘卫未[1] 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027

出　　处：《公路交通科技》2006年第7期27-30,34,共5页Journal of Highway and Transportation Research and Development

基　　金：浙江省水利厅资助项目(I40301)

摘　　要：采用双曲线型荷载传递函数,考虑单根筒桩内摩阻力沿桩身两种不同的分布形式对竖向承载力的影响,给出了具体迭代步骤及参数确定方法,并结合具体工程实例,对比分析了预测结果和实测情况。研究结果表明,考虑筒桩内摩阻力与外摩阻力呈正比的分布形式与实测情况较相符,而考虑内摩阻力从筒桩端部向上沿深度呈指数分布形式的计算结果偏保守,筒桩内摩阻力对其承载力的贡献为10%￣20%左右,忽略其影响会引起一定的计算误差。比较了同样工况和地质条件下,筒桩及相应实芯桩的承载力情况,进一步说明了同样情况下筒桩比普通实芯桩有更高的单方混凝土承载力,可以降低工程造价。Based on hyperbolic loading-transfer function the influence of two different forms of inner friction distribution in thin-wall cast-in-situ tubular pile on vertical bearing capacity is studied by using loading-transfer method. This method is modified on the basis of the one for solid pile, Detail iterative steps are put forward together with the determining method for parameters, Two case studies are used to verify the proposed method. The comparison results show that the contribution of inner friction to gross bearing capacity is around 10%-20%, which means regardless this effect the result will be conservative. And the result of linear relationship between inner and outer friction fits the measurement better than that of the exponential distribution of inner friction along the end of the pile. Under the same circumstances the vertical bearing capacity of this tubular pile is higher than corresponding solid pile. In this sense it will cost less. The research will provide theoretical bass for further design method.

关 键 词：传递函数 内摩阻力 竖向承载力 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]