基于瞬变电磁的采空区含水率评价探讨
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摘要
为了利用瞬变电磁法对采空区含水率进行评价分析,采用快速汉克尔变换和Gaver-Stehfest逆拉普拉斯变换对不同深度不同含水率的采空区模型进行了一维正演,以无采空区时的感应电压为基准,计算了不同模型各个测道的感应电压增(降)幅,并拟合了感应电压增(降)幅最值-含水率关系曲线。结果表明深厚比相同时不同含水率采空区的瞬变电磁响应有较大的差异;同一深厚比不同含水率采空区模型的感应电压增(降)幅的最值随含水率单调增加,它们之间的关系可以采用二阶多项式拟合。华北某矿采空区超高水材料注浆治理前后的瞬变电磁响应变化与理论研究结果基本相符,初步验证了瞬变电磁法评价采空区含水率的可行性。
In order to analysis goaf water ratio by using transient electromagnetic prospecting,one dimension direct interpretation for goaf model with different water ration in different depth was proceeded,which faster Hankel transform and Gaver Stehfest inverse Laplace transform was used,it taking induced voltage as base with no goaf,induced voltage variation of all measuring channel of different model were calculated,also fitting the relationship curve between induced voltage variation and water ratio,the results showed that transient electromagnetic response of goaf with different water ratio appeared more difference as deep and thickness was same,the largest value of induced voltage variation at the same deep and thickness ratio appeared monotonically increase with water ratio.Its relation could be fit by second-order polynomial.Transient electromagnetic response variation before and after governing by grouting with ultrahigh water material in one coal mine of north China was conform to theoretical analysis results,its feasibility was verified.
In order to analysis goaf water ratio by using transient electromagnetic prospecting,one dimension direct interpretation for goaf model with different water ration in different depth was proceeded,which faster Hankel transform and Gaver Stehfest inverse Laplace transform was used,it taking induced voltage as base with no goaf,induced voltage variation of all measuring channel of different model were calculated,also fitting the relationship curve between induced voltage variation and water ratio,the results showed that transient electromagnetic response of goaf with different water ratio appeared more difference as deep and thickness was same,the largest value of induced voltage variation at the same deep and thickness ratio appeared monotonically increase with water ratio.Its relation could be fit by second-order polynomial.Transient electromagnetic response variation before and after governing by grouting with ultrahigh water material in one coal mine of north China was conform to theoretical analysis results,its feasibility was verified.
引文
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[16]白登海,Maxwell A Meju,卢健,等.时间域瞬变电磁法中心方式全程视电阻率的数值计算[J].地球物理学报,2003,46(5):697-704.
[2]罗国平,张春燕,李旭.采空区含水性探测的综合电法勘探应用研究[J].中国煤炭地质,2013,25(1):44-47.
[3]陈卫营,薛国强.瞬变电磁法多装置探测技术在煤矿采空区调查中的应用[J].地球物理学进展,2013,28(5):2709-2717.
[4]解海军.煤矿积水采空区瞬变电磁法探测技术研究[D].北京:中国地质大学(北京),2009.
[5]梁建刚.瞬变电磁勘察煤田采空区的可行性分析[D].长沙:中南大学,2009.
[6]邱浩,舒宗运,张永超,等.富水采空区瞬变电磁拟地震探测实验研究[J].中国煤炭地质,2015,27(5):70-73,77.
[7]李宏杰,谷小敏,窦文武.矿井瞬变电磁法在上覆采空区水害防治中的应用[J].中国煤炭地质,2016,28(5):71-75.
[8]王伟都.瞬变电磁法在煤矿采空区含水性探测中的应用研究[D].成都:成都理工大学,2015.
[9]陈魁奎.煤矿复杂采空区瞬变电磁响应及解释方法研究[D].焦作:河南理工大学,2016.
[10]刘燚,刘树才,闫赛,等.大定源瞬变电磁法在探测煤矿采空区富水性中的研究[J].工程地球物理学报,2011,8(1):10-15.
[11]牟义,徐慧,窦文武,等.矿井回采工作面隐蔽灾害综合物探技术研究[J].煤矿开采,2016,21(6):22-27.
[12]刘勇洪.瞬变电磁技术在底板采空区富水性探测中应用[J].中国煤炭,2017,43(1):41-44.
[13]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.
[14]朴化荣.电磁测深法原理[M].北京:地质出版社,1990.
[15]张永超,贾新果,陈凯,等.瞬变电磁法探测超高水材料注浆治理采空区效果[J].煤炭科学技术,2017,45(3):174-178,100.
[16]白登海,Maxwell A Meju,卢健,等.时间域瞬变电磁法中心方式全程视电阻率的数值计算[J].地球物理学报,2003,46(5):697-704.