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用静力试验测定桩侧地基抗力系数m值,工作繁重且时间长,而用动力法测定m值则简捷得多。但用动测法时,须知道桩横向振动固有频率f_n与m值的关系。本文采用比集中质量模型更为符合实际情况的弹性体力学模型,列出有自由长度桩的横向振动微分方程,推得频率方程,并通过数值计算求得对应于实测最低阶固有频率的m值。为动测法提供了理论根据,及简便而较精确的计算方法。
The static test is used to measure the resistance coefficient m of pile foundation. The work is heavy and the time is long. The determination of m value by the dynamic method is much simpler. However, when using the dynamic test method, it is necessary to know the relationship between the natural frequency f_n and the m value of the lateral vibration of the pile. In this paper, the elastic body mechanics model which is more in line with the actual situation than the lumped mass model is used. The transverse vibration differential equations of free-length piles are listed, the frequency equation is derived, and the m value corresponding to the measured natural frequency of the lowest order is obtained through numerical calculation. . It provides a theoretical basis for the motion measurement method and a simple and accurate calculation method.