基于瞬变电磁法的张家峁煤矿地层富水性特征研究

Study on the Water Yield Property Characteristics in Zhangjiamao Coal Mine Based on Transient Electro-magnetic Method

煤矿地层的富水性探测对于煤矿的防水与治水工作至关重要。张家峁煤矿现阶段主采2-2煤层,面临上部基岩风化含水层和工作面前方火烧岩涌水的水害风险。鉴于瞬变电磁法对富水区、采空区、含水构造等高导异常体的高灵敏度等优势,本研究采用地面瞬变电磁法对该煤田西部特定区域2-2煤层上覆的基岩、风化带、第四系岩层以及烧变岩的富水性进行探测,在四个地层分别探查出低阻异常区6处、9处、9处和2处,并结合钻孔、地层、水文、地形和磁法探测成果等多元资料以及低阻异常区的可靠性,对低阻异常区的成因分别进行了综合分析,这可为该区域煤层开采防水与治水工作的规划与执行提供科学依据。同时,本研究也可为瞬变电磁法在其它地区地层富水性探测中的应用提供一套全面的数据采集、处理、反演以及分析与解释的参考与借鉴资料,以推动该技术在煤矿地层探测领域的进一步发展与应用。

Detection of water-richness coal mine strata is crucial for waterproofing and water control in coal mines.Recently,the coal seam 2-2 in Zhangjiamao coal mine is faced with potential water disaster risks from bedrock weathering aquifer above and burning rock gushed water in front of the mining face.The transient electromagnetic method has become one of the preferred technologies for water-richness detection in coal seams by virtue of its high sensitivity,high resolution,deep detection capability,high working efficiency,lightweight equipment and convenient construction process for water-rich zones,air-mining zones,water-bearing formations and other high-conductivity anomalies.Therefore,in this study,the ground-based transient electromagnetic(TEM)method is applied to the detection of water-richness of coal seam in the Zhangjiamao coal mine.As for bedrock,weathering zones,quaternary rock strata and sintered rocks in the western part of the coal field,six,nine,nine and two low resistance anomaly regions are detected respectively.Furthermore,the causes of the low resistance anomalies are comprehensively analyzed by integrating the multi-source data such as borehole,stratum,hydrology,topography and magnetic exploration.The results can provide a scientific basis for the planning and implementation of waterproofing and water control in coal seam mining in this area.At the same time,this study also provides a set of comprehensive data acquisition,processing,inversion,analysis,interpretation reference and reference materials for the application of the transient electromagnetic method in the detection of water-richness in other coal seams,thus promotes the further development and application of this technology in the field of coal seam detection.