地球物理学进展 ›› 2019, Vol. 34 ›› Issue (5): 2112-2118.doi: 10.6038/pg2019CC0357

• 应用地球物理学Ⅱ(海洋、工程、环境、仪器等) • 上一篇    下一篇

瞬变电磁法在江西罗塘石膏矿采空区勘查中的应用

张红权1,陈国玉1,*(),陈辉2,刘敏1,张华2,杨海燕2   

  1. 1. 江西省煤田地质局普查综合大队,南昌 330001
    2. 东华理工大学核资源与环境国家重点实验室,南昌 330001
  • 收稿日期:2018-11-23 修回日期:2019-06-04 出版日期:2019-10-28 发布日期:2019-10-28
  • 通讯作者: 陈国玉 E-mail:814215911@qq.com
  • 作者简介:张红权,男,1968年生,江西龙南人,高级工程师,长期从事地球物理勘探工作.(E-mail: 3213158406@qq.com)

Application of transient electromagnetic method in exploration of goaf of gypsum mine in Jiangxi Luotang

ZHANG Hong-quan1,CHEN Guo-yu1,*(),CHEN Hui2,LIU Min1,ZHANG Hua2,YANG Hai-yan2   

  1. 1. Jiangxi Coal Geology Bureau Comprehensive Team, Nanchang 330001,China
    2. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330001, China
  • Received:2018-11-23 Revised:2019-06-04 Online:2019-10-28 Published:2019-10-28
  • Contact: Guo-yu CHEN E-mail:814215911@qq.com

摘要:

江西省贵溪市罗塘石膏矿是一个已探明资源储量在3000万吨以上的大型矿区,经过数年的开采,区内多次发生地面塌陷,当前部分地面塌陷已迫近桂岭、湾上、楼梯等村庄住宅区,给附近居民的生命财产安全带来巨大隐患.由于该矿层赋存于晚白垩系灰色泥岩中,经开采后的含水采空区与上覆第四系地层和围岩的电性差异较小,限制了常用的采空区勘查技术手段的应用,给该区地质灾害勘查造成极大困难.为查明住宅区附近地下石膏矿采空区的分布情况及其对地面建筑物的影响,本文采用对低阻异常敏感、信号强度大,横向分辨率高的瞬变电磁法对区内采空区进行探测,勘查结果识别出多个异常区,结合后期钻孔资料,成功探明了该矿区地下隐伏采空区的空间展布.为该矿区地质灾害防治提供了来自地球物理勘探的基础数据,对今后类似矿区的采空区勘查工作具有借鉴作用.

关键词: 石膏矿采空区, 塌陷, 瞬变电磁法, 电性差异, 地质灾害防治

Abstract:

Luotang gypsum mine in Guixi city, Jiangxi province is a large mining area with proven resource reserves of more than 30 million tons. After several years of mining,there have been many ground collapses in the area. At present, part of the ground collapse has approached Guiling, Wanshang, Louti and other village residential areas, bring great hidden danger to the nearby residents of the safety of life and property. Due to the occurrence of the ore layer in the late cretaceous gray mudstone, the difference in electrical properties between the water-bearing goaf after mining and the overlying quaternary stratum and surrounding rock is small, which limits the application of the commonly exploration techniques used in the goaf and causes great difficulties for geological disaster investigation in this area. To find out near the residential area underground mine goaf points of situation and its influence on the ground buildings, in this paper, the Transient Electromagnetic Method(TEM), which is sensitive to low resistance abnormality, strong signal strength and high transverse resolution, is used to detect the goaf in the area. The investigation results identified several abnormal areas, and combined with the later drilling data, the spatial distribution of the underground hidden goaf in the mining area was found successfully. It provides basic data from geophysical exploration for geological disaster prevention and control in this mining area, and can be used for reference in the exploration of similar mining areas in the future.

Key words: Gypsum mine goaf, Collapse, Transient Electromagnetic Method(TEM), Electrical differences, Geological disaster prevention

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