地球物理学进展 ›› 2021, Vol. 36 ›› Issue (3): 1145-1153.doi: 10.6038/pg2021EE0275

• 应用地球物理学Ⅰ(油气及金属矿产地球物理勘探) • 上一篇    下一篇

生产矿山岩溶灾害勘查中的综合物探应用研究

杨天春1(), 王丹齐1, 张叶鹏2, 付国红3,*(), 陈波4, 杨追4, 程辉3   

  1. 1.湖南科技大学资源环境与安全工程学院,湘潭 411201
    2.湖南省有色地质勘查局二四七队,长沙 410129
    3.湖南科技大学先进矿山装备教育部工程研究中心,湘潭 411201
    4.湖南普奇地质勘探设备研究院,长沙 410000
  • 收稿日期:2020-09-22 修回日期:2021-01-30 出版日期:2021-06-20 发布日期:2021-07-01
  • 通讯作者: 付国红 E-mail:ytc6803@163.com;fghcsu@163.com
  • 作者简介:杨天春,男,1968年生,博士,教授,主要从事物探方面的教学与科研工作. E-mail: ytc6803@163.com
  • 基金资助:
    国家自然科学基金(42074219);国家重点研发计划项目(2018YFC0603900)

Application research of comprehensive geophysical method to karst investigation in a productive mine

YANG TianChun1(), WANG DanQi1, ZHANG YePeng2, FU GuoHong3,*(), CHEN Bo4, YANG Zhui4, CHENG Hui3   

  1. 1. School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
    2. Team 247 of Hunan Provincial Non-ferrous Metals Geological Exploration Bureau, Changsha 410129, China
    3. Engineering Research Center of Advanced Mining Equipment, Ministry of Education, Hunan University of Science and Technology, Xiangtan 411201, China
    4. Hunan Puqi Geological Exploration Equipment Research Institute, Changsha 410000, China
  • Received:2020-09-22 Revised:2021-01-30 Online:2021-06-20 Published:2021-07-01
  • Contact: FU GuoHong E-mail:ytc6803@163.com;fghcsu@163.com

摘要:

地下岩溶是常见的地质灾害之一,它对矿山的生产安全、周边房屋建筑和交通设施造成极大的危害;预先确定岩溶的埋深及空间分布规律,可为岩溶灾害治理提供科学依据.本文以正在生产中的某石灰石露天开采矿山为研究对象,研究地球物理方法在强噪声环境、地形起伏及切割强烈条件下的应用效果.本文采用高密度电阻率法、瞬变电磁法和天然电场选频法等方法开展地下岩溶的探测研究,勘探深度为100 m.依据现场情况和目的要求共敷设物探剖面28条,累计总长18.875 km;结合以往钻探成果,从已知到未知,对物探资料开展综合解译,共推断岩溶发育位置167处,进一步结合现场水文地质调查情况,圈定出工作区内岩溶发育集中区;最终,利用验证钻孔的成果证明物探解译成果的可靠性.实践应用表明,高密度电阻率法受到生产矿山环境与地形切割的影响较大,瞬变电磁法在使用等值反磁通瞬变电磁法采集系统的情况下,它与天然电场选频法都受环境与地形的影响较小;高密度电阻率法和瞬变电磁法可较好地确定覆盖层厚度、划分基岩面的起伏;瞬变电磁法成果对地下岩溶的反映比较清晰,可依据其局部低电阻率异常来判定岩溶的大致埋深及相对大小;天然电场选频法剖面曲线的低电位异常可以准确指明低阻岩溶发育的水平中心位置,对钻孔平面位置的布设有很好的指导作用.

关键词: 地球物理, 岩溶, 综合物探, 高密度电阻率法, 瞬变电磁法, 天然电场选频法, 灾害

Abstract:

Underground karst is one of the common geological disasters, it can cause great harm to the safety of mines, surrounding buildings and traffic facilities. If the depth and spatial distribution of karst are determined in advance, it can provide scientific basis for prevention and control of karst disasters. An opencast limestone was taken as the research object in this paper, the application effect of some geophysical methods in strong noise pollution, terrain relief and dip topography condition was studied. Because of the strong vibration interference in mine production, seismic geophysical methods could not be carried out. The authors used High-Density Resistivity Method(ERT),Transient Electromagnetic Method (TEM) and Frequency Selection Method for Telluric Electricity Field (FSMTEF) to detect underground karst. The detection depth was 100 m. According to the field conditions, purpose and requirements, 28 geophysical profiles were arranged, with a total length of 18.875 km. Combined with previous drilling data, the geophysical data were interpreted comprehensively from known to unknown. A total of 167 karst locations were inferred; and based on the hydrogeological survey data, the karst concentration areas in the working area were delineated. Finally, the verified drilling results proved the reliability of geophysical interpretation results. Practical application shows that ERT is greatly affected by the mining environment and terrain cutting, but FSMTEF and TEM are less affected when Opposing Coils Transient Electromagnetic Method (OCTEM) is used. In particularly, ERT is greatly affected by the stray current. ERT and TEM can determine the overburden thickness and bedrock topography map. The results of TEM reflect the underground karst clearly, and the approximate depth and relative size of karst can be determined according to the local low resistivity anomaly. The low potential anomaly of the FSMTEF profile curve can accurately indicate the horizontal center position of good conductive karst, it has a good effect for guiding the plane position of drilling wells. The practical effect also shows that it is very important to select the appropriate geophysical methods according to the actual condition in the field, and advanced data processing technology may be minor in complex environment.

Key words: Geophysics, Karst, Comprehensive geophysical survey, High-density Resistivity Method (ERT), Transient Electromagnetic Method (TEM), Frequency Selection Method for Telluric Electricity Field (FSMTEF), Disaster

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