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以浙江杭千高速公路现场实际工程为依托,建立了PCC桩-桩周土-桩芯土有限元模型,采用现场试验结果验证了模型合理性。在此基础上,研究了竖向-水平荷载共同作用下PCC桩竖向荷载传递机理。研究结果表明,先期水平荷载的施加致使桩顶沉降增大,不同先期水平荷载的影响效果差别不大;先期水平荷载对桩侧土抗力和桩外侧摩阻力的影响在埋深约2/3范围内作用明显,迎土侧二者均随水平荷载增大而逐渐增大,背土侧二者均随水平荷载增大而逐渐减小,且水平荷载较大时桩顶背土侧附近出现零应力区;桩内侧摩阻力沿桩身近似呈L形分布,几乎不受水平荷载影响。
Based on the actual project of Hangzhou-Hangzhou Expressway, the finite element model of PCC pile-pile surrounding soil-pile core is established. The field test results verify the rationality of the model. On this basis, the vertical load transfer mechanism of PCC pile under vertical-horizontal load is studied. The results show that the settlement of the top of the pile increases with the application of the previous horizontal loads, and the effect of the horizontal loads is not significantly different. The effect of the initial horizontal load on the soil resistance of the pile and lateral friction of the pile is about 2/3 Both of them both increase gradually with the increase of horizontal load, both of them decrease gradually with the increase of horizontal load, and when the horizontal load is large, zero Stress zone; pile friction along the pile body near the L-shaped distribution, almost free from horizontal load.