伪随机震源面波法频谱特征及其勘探深度分析

doi:10.6038/pg2018AA0585

地球物理学进展 ›› 2018, Vol. 33 ›› Issue (4): 1734-1739.doi: 10.6038/pg2018AA0585

• 应用地球物理学Ⅱ（海洋、工程、环境、仪器等） • 上一篇下一篇

伪随机震源面波法频谱特征及其勘探深度分析

席超强¹,胡泽安¹,张平松^1,²

^1. 安徽理工大学地球与环境学院,安徽淮南 232001
^2. 全国煤炭行业矿井水害综合防治工程研究中心,安徽淮南 232001;

收稿日期:2017-09-24 修回日期:2018-05-20 出版日期:2018-08-20 发布日期:2018-09-14
作者简介:席超强,1993年生,博士,主要从事高频面波法的研究.(Email: xichaoqiang626@163.com)
基金资助:
国家十三五重点研发计划项目(2016YFC0600900)

Analysis of spectral characteristics and exploration depth of vibroseis-random source

XI Chao-qiang¹,HU Ze-an¹,ZHANG Ping-song^1,²

^1. School of Earth and Environment, Anhui University of Science and Technology, Anhui Huainan 232001, China
^2. Engineering Research Center of Mine Water Disaster Comprehensive Control of Nationwide Mining Industry, Anhui Huainan 232001, China;

Received:2017-09-24 Revised:2018-05-20 Online:2018-08-20 Published:2018-09-14

摘要/Abstract

摘要：

多道面波分析勘探法在工程场地安全评价中应用广泛,主要有人工源和天然源两种方法,但人工源法具有勘探深度相对较小的缺陷;天然源法其数据采集周期长现场操作便捷性差.文章通过引入伪随机震源作为面波勘探震源,希望能够在较短的采样周期内获取质量较高的频散能量谱.对获得的面波数据记录分别使用适合主动源法的F-K法以及适用于被动源法的SPAC法获取相应频散谱,并将伪随机震源的频散谱与同场地、同排列条件下人工源和天然源面波数据结果对比,认为:(1)运用SPAC法进行伪随机震源面波法频散分析所得到的频散谱收敛性较高;(2)伪随机震源面波法能够弥补人工源面波法勘探深度较小的缺点,相对于天然源面波法能够兼顾浅层高频区域,且现场操作简单、工作效率更高,适宜于不同地质条件的场地应用评价.

关键词: 伪随机震源, 人工源面波, 天然源面波

Abstract:

MASW is widely used in engineering site safety evaluation. it contained two methods: active surface waves and passive surface waves, but the active surface waves method has the defects of relatively small depth of exploration. The passive surface waves method has a time consuming and poor convenience. In this paper, the F-K method and the SPAC method are used to process the surface wave data, and the frequency spectrum of the vibroseis-random source is compared with that of the same field and the artificial environment. Compared with the results of the surface waves data, it is concluded that the SPAC method is better used to analyze the dispersion spectrum of the vibroseis-random source surface wave method. The vibroseis-random source surface wave method can compensate for the low depth of the artificial surface wave method shortcomings, compared with the passive surface waves method can take into account the shallow high-frequency region, and the field operation is simple, more efficient, suitable for different geological conditions of the site application evaluation.

Key words: vibroseis, passive MASW method, active MASW method

中图分类号:

P631

席超强, 胡泽安, 张平松. 2018. 伪随机震源面波法频谱特征及其勘探深度分析. 地球物理学进展, 33(4): 1734-1739. doi: 10.6038/pg2018AA0585.

Chao-qiang XI, Ze-an HU, Ping-song ZHANG. 2018. Analysis of spectral characteristics and exploration depth of vibroseis-random source. Progress in Geophysics. 33(4): 1734-1739. doi: 10.6038/pg2018AA0585.

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勘探类型	人工源面波法	天然源面波法	伪随机震源
震源	18磅大锤	大地微震	夯机震源
检波器类型	4.5 Hz	4.5 Hz	4.5 Hz
检波器排列	24道线性排列	24道线性排列	24道线性排列
道间距/m	2	2	2
偏移距距/m	4
采样间隔/ms	0.5	2	2
采样点数	2 k	160 k	16 k
采样时间/s	1	320	32

伪随机震源面波法频谱特征及其勘探深度分析

Analysis of spectral characteristics and exploration depth of vibroseis-random source

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