采煤工作面底板水双频激电法数值仿真与探测试验  

Numerical simulation and exploration test for water from the floor strata ofcoal-mining face using dual-frequency induced polarization method

作　　者：胡雄武[1,2,3] 徐标 张平松 吴荣新[1] 付茂如[1] 程林[1] HU Xiongwu;XU Biao;ZHANG Pingsong;WU Rongxin;FU Maoru;CHENG Lin(School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001 China;Key Laboratory of Mine Geological Disaster Prevention and Environment Protection of Anhui Higher Education Institutes,Huainan 232001,China;State Key Laboratory Mining Response and Disaster Prevention and Control in Deep Coal Mines,Huainan 232001,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]矿山地质灾害防治与环境保护安徽普通高校重点实验室,安徽淮南232001 [3]深部煤矿采动响应与灾害防控国家重点实验室,安徽淮南232001

出　　处：《煤炭学报》2022年第8期3024-3036,共13页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(41702177);国家重点研发计划资助项目(2018YFC0807804-3)。

摘　　要：深部煤层开采常遭受底板水害威胁,严重影响煤矿安全高效生产。采用矿井电法实施采场底板岩层富水性探测是煤矿水害防治工作中的一项重点内容,但该方法面临实测电阻率多解性强及异常定位不准的难题。为进一步提高对岩层富水区的判定精度,提出了采煤工作面双频激电(Induced Polarization,IP)全方位探测方法。结合淮南矿区深部A组煤层顶底板地质与地电条件,构建了不同方位的圆柱体富水异常地电模型;以Cole-Cole模型为激电效应基础,采用有限元方法实施了双频激电数值模拟,理论分析了不同异常模型的激电视参数响应特征,其结果表明:①单巷激电视参数表现为低阻高频散异常,曲线“交点”可准确定位异常模型的走向位置,但难以确定异常模型的准确方位。②双巷透视各发射点对应的激电视参数曲线在异常模型附近聚焦,同样表现为低阻高频散异常特征,发射点与异常模型的位置关系决定了视参数曲线形态及性质,接收点与异常模型的位置关系决定了异常幅度大小。激电视参数对面内及巷道底板异常模型的响应幅度大,对面外模型异常响应幅度偏小。为进一步评价激电视参数成像精度,对比分析了双巷透视和全方位数据的三维反演结果,表明单巷测深和双巷透视数据可相互约束,利用全方位方法所得的激电反演结果能精准定位各异常模型,体现了该方法的优越性。工程实践进一步表明,该方法能有效降低电性异常的多解性,大幅提高异常空间定位精度,改善煤层底板岩层富水区的判定效果,为煤矿水害精准防治提供了有力的技术支撑。Deep coal seam mining is often threatened by water damage under the floor,which seriously affects the safe and efficient production of coal mines.Using mine electrical method to detect the water abundance of floor strata is an important way in the prevention and control of water disasters in coal mines,but this method faces the problems of strong multi-solution of measured resistivity and inaccurate positioning of anomalies.In order to further improve the detection accuracy of the water-rich area of the rock strata,an all-around dual-frequency induced polarization(IP)method for the coal mining face was proposed.Combined with the geological and geoelectric conditions of the roof and floor of deep group A coal seams in the Huainan mining area,the geoelectric models of the water-rich cylinders in different directions were constructed.Based on the Cole-Cole model,the numerical simulation for the dual-frequency induced polarization field was carried out by using the finite element method,and the response characteristics of IP parameters of different anomaly models were analyzed theoretically.The results show that①The apparent parameters of IP in a single roadway show low resistivity and high-frequency dispersity.The intersection point of the curves can accurately locate the strike position of the abnormal models,but is unable to determine its orientation exactly.②The curves of apparent parameters of IP corresponding to each transmitting point in the double roadway are focused near the abnormal model,and also show the abnormal characteristics of low resistivity and high-frequency dispersity.The position relationship between the transmitting points and the abnormal models determines the shape and properties of the apparent parameter curves,and the position relationship between the receiving points and the abnormal models determines the amplitude of apparent parameters.In which,the apparent parameters amplitude responded by the abnormal model lied in the working face or roadway floor is larger than that lied outside

关 键 词：采煤工作面 底板水 双频激电法 数值仿真 

分 类 号：P631[天文地球—地质矿产勘探]