桩周土阻尼及检测点分布对低应变反射波法的影响分析

Analysis of Influence of Soil Damping around Pile and Distribution of Testing Points on Low Strain Reflected Wave Method

本文借助有限元软件ABAQUS/Explicit对完整桩进行数值模拟分析,建立桩土分析模型,提取模型的频率及振型,得到桩周土不同阻尼比下的阻尼系数,计算得到了不同阻尼比下的桩顶速度时程曲线,分析研究了检测点分布位置、桩侧土阻尼、桩端土阻尼等因素对低应变中桩顶速度时程曲线的影响,并总结了相应的规律,为实际检测工作提出了一些更为精确的依据。

The finite element software ABAQUS/Explicit is used to carry out the numerical simulation analysis of the complete pile,establish the pile-soil analysis model,extract the frequency and vibration mode of the model,obtain the damping coefficient under different damping ratio of the soil around the pile,calculate the time history curve of the pile top speed under different damping ratio,analyze and study the factors such as the distribution position of the detection point,the soil damping at the pile side,the soil damping at the pile end,etc.The influence of time history curve of pile top velocity in low strain is summarized,which provides some more accurate basis for the actual detection work.