基于瞬变电磁法的超浅层采空区探测
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摘要
为了研究瞬变电磁法对超浅层采空区的探测效果,以陕北某小煤窑采空区为研究对象,从数值模拟与现场实测2方面对其瞬变电磁响应展开研究。首先针对目标体地质条件建立K型地电模型,从电阻率差异角度论证理论可行性;其次根据理论结果设置采集参数,以电性标志层电阻率差异为依据对采空区分布范围进行推断;最后采用地面钻探对异常区进行验证。结果表明:瞬变电磁法盲区有限,采用240 m×240 m发射回线时最小探测深度小于20 m,能准确反映超浅层采空区的分布。
In order to study the effect of transient electromagnetic(TEM) on the detection of ultra-shallow gob, the goaf of a small coal mine in northern Shaanxi is regarded as the research object, and its TEM response is studied from aspects of numerical simulation and field measurement. Ground electricity model is established according to the condition of the research object at first,and theoretical feasibility is demonstrated on the basis of the difference of resistivity. Secondly, the acquisition parameters are set up according to the theoretical results, measured results are analyzed combined with geological conditions, the range of the gob is inferred. Finally, abnormal area is exposed by ground drilling. The results show that the dead depth of TEM is very small. The minimum detection depth is less than 20 m when loop size is 240 m ×240 m. The distribution of the ultra-shallow gob can be detected accurately by TEM.
In order to study the effect of transient electromagnetic(TEM) on the detection of ultra-shallow gob, the goaf of a small coal mine in northern Shaanxi is regarded as the research object, and its TEM response is studied from aspects of numerical simulation and field measurement. Ground electricity model is established according to the condition of the research object at first,and theoretical feasibility is demonstrated on the basis of the difference of resistivity. Secondly, the acquisition parameters are set up according to the theoretical results, measured results are analyzed combined with geological conditions, the range of the gob is inferred. Finally, abnormal area is exposed by ground drilling. The results show that the dead depth of TEM is very small. The minimum detection depth is less than 20 m when loop size is 240 m ×240 m. The distribution of the ultra-shallow gob can be detected accurately by TEM.
引文
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[3]王新锋.榆神高速公路路基采空区治理技术研究[D].西安:西安科技大学,2013.
[4]孟强华,窦文武.瞬变电磁探测在煤矿采空区积水边界探测中的应用[J].煤炭技术,2018,37(2):123.
[5]杨勇.瞬变电磁和高密度电法在浅埋房柱式采空区探测中的应用[J].煤矿开采,2017,22(4):87-89.
[6]王树威.小煤窑采空区综合探测技术的应用研究[D].西安:西安科技大学,2012.
[7]刘海生.高密度电法在探测煤矿地下采空区中的应用研究[D].太原:太原理工大学,2006.
[8]李文.煤矿采空区地面综合物探方法优化研究[J].煤炭科学技术,2017,45(1):194-199.
[9]张向峰.陕北小煤窑采空区的勘察与评价[J].胜利油田职工大学学报,2009,23(1):39-41.
[10]石战结,田钢,赵文轲,等.超浅层三维地震勘探技术应用[J].浙江大学学报(工学版),2013,47(5):912.
[11]牛跟彦.超浅层地震勘探技术在小煤窑采空区中的应用研究[J].中国煤炭,2012,38(6):50-51.
[12]王益,王鹏.地面瞬变电磁数据的早期畸变与校正方法[J].中国煤炭地质,2017,29(6):74-78.
[13]俞林刚.瞬变电磁早期信号处理技术研究[D].重庆:重庆大学,2013.