天然源面波勘探采集参数对比试验及工程应用

摘要

In recent years,natural source surface wave method has made great progress in theoretical research and instrument development.In order to compare the natural source surface wave exploration with different acquisition parameters,summing up the acquisition parameters which is reliable result and convenient field construction.This paper acquired different parameters experiment data in the Urumqi badaowan in which the bay area covered by Quaternary natural.And the results of data using SPAC method to extract dispersion curves show shallow S-wave velocity structure model.The analysis of the experimental results shows that the dispersion curves obtained in different sampling parameters at the same test site are different in depth and resolution.Among,the station maximum length is greater for 5ms sampling interval;the smaller sampling interval of dispersion has better longitudinal resolution and higher interference noise impact;with the increase in the number of iterations,the dispersion curves gradually converge until stable.According to the experimental results,the appropriate parameters selected are confirmed with reliability of the detection accuracy and the results by practical application.%为对比天然源面波勘探中不同采集参数的勘探效果,总结探测结果的可靠且便于野外施工采集参数,在乌鲁木齐市八道湾第四系覆盖区采集了不同参数的天然源面波方法场地实验数据,并对各种结果数据使用空间自相关法提取相应的频散曲线,通过反演得到试验点地下浅层横波速度结构模型.结果表明,在同一试验点应用不同采集参数所获取的频散曲线在探测深度及分辨力方面均有差异.其中,测站最大边长长度越大探测深度越大;采样间隔为5 ms的频散曲线纵向分辨力更高且受干扰影响越小;随迭代次数的增加,频散曲线逐渐收敛直至稳定.据试验成果选择确定合适的方法采集参数,通过工程应用证实探测精度和结果的可靠性.