时域垂直载重桩反应与土体模式应用

Time-domain response of vertically loaded pile with soil models applied

本文以不同土壤弹簧和依时性阻尼系数 ,配合波动方程有限差分解仿真基桩反应。由t-z和Q-z曲线方程式所推求的弹性土层弹簧系数和依据三维波传递动力阻抗函数所建立之转换阻尼 ,可仿真桩载重反应。基桩位移量和位移历史和土 -桩界面模式相关。本研究模式和其它学者建议模式之差异显现于单调载重的桩顶位移量和冲击载重作用后桩顶位移之衰减 ,调整转换阻尼参数和土壤弹簧系数值可减少分析差异。透过土层弹簧系数修正 ,该项分析模式可仿真桩设计位移曲线和现场桩载重试验数据。

This paper introduces the modeling of the vertical pile response from time-domain wave equation analysis with the soil spring constants derived from t-z and Q-z curves and the time-dependent damping coefficients obtained from the dynamic impedance functions. The pile displacements under various loads were simulated efficiently, and they are highly dependent of the soil-pile interface model used. The major difference between this solution and others appears to be the pile-head displacements under monotonic load and the attenuation of displacements under impulsive load. Calibrating the parameters in the damping model and soil spring can minimize the deviations. By correcting the soil spring constant, the model can be used to obtain the design curves of pile displacements and to match the experimental data of in situ pile load tests.