影响基桩动测锤击效果的因素分析

摘要

振源是基桩动测中的一个重要环节,宽窄不同的脉冲振源会导致实测信号分辨率不同,进而影响桩体缺陷的测试.基于锤体的不同参数,对动力试桩的锤击效果进行仿真模拟研究,讨论了导致输入脉冲时域和频域变化的各种具体因素,结合力锤冲击脉冲的解析解与试验实测数据归纳出相关规律,提出了相应的锤加工、使用建议,并给出了力锤输入脉冲的拟合形式,具有较重要的理论及工程实际意义.%Local oscillator is an important aspect of the piles' dynamic test. The width of different local oscillator signals will lead to the difference of resolution of the measurement. This paper studies the simulation of the hammering effects on piles' dynamic test based on different parameters of the hammer, then discusses the variety of specific factors which leads the input pulse in time domain and frequency domain changes, summarizes the relevant rule based on the analytical data of hammer pulse and the experimental data. Furthermore,puts forward the corresponding hammer processing,gives some suggestions in application,and presents the hammer input pulse fitting form. The analysis has a more significance of academic research and application in engineering practice.