摘要
地下空洞埋藏浅、规模小不易探测,随着重力感应技术的发展,给准确快速获取微重力变化为探测地下空洞带来新机会,对小规模地下空洞的探测能力具有广泛的研究和实用价值。本文从重力基础理论、重力探测技术、重力数据处理及反演3方面对地下空洞进行系统的分析研究。在给定形体大小、重力数据精度的情况下,通过二分法计算出了重力探测的最大埋藏深度;将高密度采集、高精度重力探测方法用于某区客运站地下人行通道实际探测,获得一套高精度重力格网数据,理论研究和实测结果表明,现有重力仪器具有探测地下空洞的能力;采用最小曲率位场分离方法、2.5D人机交互反演和靶区识别三维物性快速反演方法,得到地下人行通道近SN向的分布,埋藏深度大致2.5~5 m,这与实际情况相符。本次研究为地下空洞探测摸索出一套完整的重力勘探流程,具有一定的参考价值。
Underground cavities with shallow burial and small scale are difficult to detect.With the development of gravity sensing technology,the accurate and rapid acquisition of micro-gravity variations brings new opportunities for detecting underground cavities,and it has wide research and practical value for the detection of small-scale underground cavities.This paper systematically analyzes and studies underground cavities from three aspects:gravity basic theory,gravity detection technology,and gravity data processing and inversion.Under given body size and gravity data accuracy,the maximum burial depth of gravity detection is calculated using the bisection method.High-density acquisition and high-precision gravity detection methods are applied to the actual detection of an underground pedestrian tunnel in a certain area of a passenger station.A set of high-precision gravity grid data is obtained.The theoretical research and measurement results indicate that existing gravity instruments have the ability to detect underground cavities.By using the minimum curvature potential field separation method,2.5D interactive inversion and the target area recognition three-dimensional physical property fast inversion method,the approximate SN distribution and burial depth of the underground pedestrian tunnel are obtained,which is approximately 2.5~5 m,consistent with the actual situation.This study has developed a complete gravity exploration process for detecting underground cavities,and it has certain reference value.
作者
杨敏
徐新强
陈明
纪晓琳
王万银
赵东明
周巍
张义蜜
YANG Min;XU Xin-Qiang;CHEN Ming;Ji Xiao-Lin;WANG Wan-Yin;ZHAO Dong-Ming;ZHOU Wei;ZHANG Yi-Mi(Xi’an Division of Surveying and Mapping,Xi’an 710054,China;Hubei Subsurface Multi-scale Imaging Key Laboratory,School of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China;Institute of Geospatial Information,Information Engineering University,Zhengzhou,450001,China;Guangdong Geological and Geophysical Engineering Investigation Institute,Guangzhou 510000,China;Information and Navigation College,Air Force Engineering University 710007,China;School of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China;National Engineering Research Center of Offshore Oil and Gas Exploration,Beijing 100028,China;Key Laboratory of Smart Earth,Xi’an 710054,China)
出处
《物探与化探》
CAS
2024年第3期876-883,共8页
Geophysical and Geochemical Exploration
基金
湖北省重点实验室开放基金“地球内部多尺度成像”(SMIL-2023-06)。
关键词
重力勘探
地下空洞
客运站
地下人行通道
正反演研究
gravity exploration
underground cavities
passenger station
underground pedestrian tunnel
forward and inverse modeling research
