刘康^1,2,3,4,,
戴靠山^4,5,
许强^5,,,
翁渝峰⁴,
黄李观⁴,
赵逍⁴,
游庆瑜^1,2,3
1. 中国科学院地质与地球物理研究所, 中国科学院油气资源研究重点实验室, 北京 100029
2. 中国科学院地球科学研究院, 北京 100029
3. 中国科学院大学, 北京 100049
4. 同济大学土木工程防灾国家重点实验室, 上海 200092
5. 成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059

基金项目: 国家自然科学基金（U1710111），成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金（SKLGP2016K006），上海市国际科技合作项目（16510711300）联合资助


详细信息

作者简介: 刘康, 男, 1989年生, 中国科学院地质与地球物理研究所博士研究生, 主要从事综合地球物理、面波勘探等领域的相关研究工作.E-mail:liukang@mail.iggcas.ac.cn

通讯作者: 许强, 男, 1968年生, 成都理工大学教授, 博士生导师, 主要从事地质灾害预测评价及防治治理方面的教学和研究工作.E-mail:xuqiang_68@126.com

中图分类号: P631

收稿日期:2017-05-11
修回日期:2018-04-13
上线日期:2018-06-05

Nearest offset design for Multichannel Analysis of Surface Waves (MASW) method with buried source excitations

LIU Kang^1,2,3,4,,
DAI KaoShan^4,5,
XU Qiang^5,,,
WENG YuFeng⁴,
HUANG LiGuan⁴,
ZHAO Xiao⁴,
YOU QingYu^1,2,3
1. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. Institutes of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
5. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China


More Information

Corresponding author: XU Qiang,E-mail:xuqiang_68@126.com

MSC: P631

--> Received Date: 11 May 2017
Revised Date: 13 April 2018
Available Online: 05 June 2018


摘要
摘要:多道面波分析（MASW）法是一种被广泛使用的浅层地震勘探方法.为解决埋入源近场效应对MASW法应用的影响，本文分析了埋入源产生的Rayleigh波传播机制，探讨了MASW法的排列参数对地震记录的影响，提出了确定最小偏移距的经验公式.通过对实际地质模型的有限元模拟，验证了经验公式的合理性.在以经验公式为指导的野外实测中，利用多种方法提取了相对可靠的频散曲线，采用基阶和高阶面波联合反演，所得的一维速度结构与钻孔资料具有很强的相关性，表明本文发展的最小偏移距估计方法具有一定的实际应用价值.
关键词: 多道面波勘探/
Rayleigh波/
埋入源/
最小偏移距/
射线理论

Abstract:Multichannel Analysis of Surface Waves (MASW) method, has found wide applications in shallow exploration for civil and earthquake engineering. One interesting problem associated with the application of MASW method is how to select the geophone's nearest offset. The nearest offset is a key parameter that controls the near-field effect, so it affects the dispersion image's resolution and the inversion results. This paper studies the propagation of Rayleigh waves generated by buried source and develops an empirical equation for the nearest offset estimation based on the Ray theory, which is verified by numerical simulation. A case study at a site close to a subway line is implemented with the guidance of the proposed empirical equation. The one dimensional shear velocity structure, obtained by a joint inversion of both fundamental and higher modes, shows a clear correlation with the given geologic features. Therefore, the proposed nearest offset estimation method is recommended in the real-world application of MASW method for cases as Rayleigh waves are generated by a buried source.
Key words:MASW/
Rayleigh wave/
Buried source/
Nearest offset/
Ray theory



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