桩底沉渣对嵌岩钻孔灌注桩承载性状影响研究

Influence of Pile Bottom Sediment on the Bearing Property of Rock-socket Filling Pile

结合某嵌岩灌注桩工程,采用弹塑性有限元方法模拟桩底有沉渣条件下,桩底沉渣对桩的承载性状影响,分析有桩底沉渣情况下荷载-沉降曲线、桩身轴力和侧摩阻力、桩端阻力和总侧阻力的变化情况,有限元模拟荷载-沉降曲线与实测曲线相符,由于桩底沉渣的存在,大大降低了桩端阻力,从而降低桩的极限承载力,增大了桩顶沉降。

Combined with a project of rock-socketed filling pile, and based on the intluence ot pile bottom sediment on the bearing property under the simulation of sediment at the end of the pile with elastic-plastic finite element method, analysis was made on the changes of load-settlement curves, axial force of the pile, shaft resistance, pile-end resistance and the total pile-shaft resistance. The load-settlement curves from the finite element simulation are consistent with the measured curves. The sediment at the pile bottom greatly reduces the pile end resistance, also reduces the ultimate bearing capacity of the pile and increases the settlement of the pile head.