摘要
微动探测技术采用台阵方法来接收天然场源微动信号,提取瑞雷波频散曲线获取面波相速度;通过频散曲线反演获得地层的横波速度,进而分析地下介质的结构特征,最后对土类型进行分层。本文介绍了微动勘探在广西北海市地下空间调查中的应用情况,通过嵌套式等边三角形布置对微动数据进行采集,并利用专业软件提取频散曲线,通过对频散曲线进行反演获得地层的横波速度,对城市软硬土划分、建筑场地类别划分提供了地球物理依据,以此推断城市地下空间结构,并对微动探测的应用进行了探讨。最终根据对北海软硬土的划分分析了北海市坚硬土顶界面起伏情况,为北海地区地下空间资源利用、城市规划建设、城市安全性及重大工程建设等工作提供地质科学支撑,更为我国其他沿海地区开展城市地质调查工作提供示范。
Micro motion detection technology uses the array method to receive the micro motion signal from the natural field source,and extracts the Rayleigh wave dispersion curve and the surface wave phase velocity from it.Through the inversion of the dispersion curve,the S-wave velocity of the stratum is obtained,and the apparent transverse wave velocity structure of the underground material is obtained.The structural characteristics of the underground medium are analyzed,and the soil type is analyzed and stratified.This paper introduces the application of micro motion exploration in the investigation of underground space in Beihai City,Guangxi.The S-wave velocity of the stratum is obtained by inversion of the dispersion curve,which provides the geophysical basis for the division of urban soft and hard soil and the classification of construction site,so as to infer for the urban underground space structure,and to discuss the application of micro motion detection.Finally,according to the division of soft and hard soil in Beihai,the fluctuation of hard soil top interface in Beihai is analyzed,which provides the geological scientific support for underground space resource utilization,urban planning and construction,urban safety and major engineering construction in Beihai,and also provides a demonstration for other coastal areas in China to carry out urban geological survey.
作者
石科
杨富强
李叶飞
莫亚军
区小毅
SHI Ke;YANG Fuqiang;LI Yefei;MO Yajun;OU Xiaoyi(Geophysical Survey Institute of Guangxi,Liuzhou 545005,Guangxi,China)
出处
《矿产与地质》
2020年第2期355-365,共11页
Mineral Resources and Geology
基金
中国地质调查局城市调查项目“北海海岸带陆海统筹综合地质调查:陆域物探项目”(编号:HBT-17180108-180756)资助。
关键词
微动探测
地下空间结构
北海市
广西
micro motion detection
underground space structure
Beihai City
Guangxi
