特厚煤层工作面煤厚变化电磁波透视响应特征  

Electromagnetic Wave Perspective Response of Coal ThicknessChange of Extra Thick Coal Face

作　　者：吴荣新[1] 李响 王锦国 肖玉林[1] WU Rongxin;LI Xiang;WANG Jinguo;XIAO Yulin(School of Earth and Environment,Anhui University of Science and Technology,Huainan Anhui 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

出　　处：《安徽理工大学学报（自然科学版）》2024年第3期61-68,共8页Journal of Anhui University of Science and Technology:Natural Science

基　　金：安徽省高校研究生基金资助项目(YJS20210379)。

摘　　要：目的为掌握煤厚变化对特厚煤层工作面电磁波透视探测的影响,以准确圈定地质异常区,保障工作面安全高效生产。方法根据煤层工作面地质条件,利用三维仿真软件,对煤厚变化进行了电磁波透视数值模拟,并结合工作面探查实例进行了分析。结果0~20m煤厚范围,随煤厚减小,电磁波透视场强值呈抛物线下降趋势,可分为缓慢降低(煤厚≥9m)、明显降低(9m>煤厚≥5m)和快速降低(煤厚<5m)3个范围。煤厚10m以上的工作面适合于依据相对煤层变薄程度和变薄区煤厚来分析透视电磁波响应:变薄程度>1/3正常煤厚且煤厚<8m的薄煤区有明显响应,变薄区煤厚越小,透视电磁波场强降低越显著。煤厚10m以下的工作面,可以仅依据相对煤层变薄程度分析透视电磁波响应:变薄程度>1/4正常煤厚的薄煤区有明显响应,变薄程度越大,透视电磁波场强降低越显著。陕西金源招贤矿业有限公司特厚煤层1304工作面探测实例表明:正常煤厚变化及薄煤区的电磁波响应特征与数值模拟结果一致;工作面物探圈定的落差1m以上断层及薄煤区范围,与实际揭露范围相吻合。结论利用煤厚变化电磁波响应特征能够可靠地探查特厚煤层工作面地质异常区范围。Objective In order to grasp the influence of coal thickness change on the electromagnetic wave perspective detection of the working face of the extra-thick coal seam,so as to accurately delineate the geological anomaly area and ensure the safe and efficient production of the working face.Methods According to the geological conditions of the coal face,the electromagnetic wave perspective numerical simulation of the coal thickness change was carried out by using 3D simulation software,and the analysis was carried out in combination with the exploration example of the working face.Results The results show that in the range of 0~20m coal thickness,with the decrease of thickness,the electromagnetic wave perspective field strength value shows a parabolic downward trend,which can be divided into three ranges:slow decrease(thickness≥9m),obvious decrease(9m>thickness≥5m)and rapid decrease(thickness<5m).For the working face with a coal thickness of more than 10m is suitable for analyzing the perspective electromagnetic wave response based on the relative thinning degree of the coal seam and the thickness of the coal in the thinning area:the thin coal area with a thinning degree of more than 1/3 of the normal coal thickness and a coal thickness of less than 8m has obvious response.The smaller the coal thickness in the thinning area,the more significant the reduction of the perspective field strength value.For the working face with coal thickness less than 10m,the perspective electromagnetic wave response can be analyzed only based on the relative thinning degree of the coal seam:the thin coal area with thinning degree>1/4 of the normal coal thickness has obvious response,and the greater the thinning degree,the more significant the reduction of the perspective field strength value.The detection example of 1304 working face of Shaanxi Jinyuan Zhaoxian Mining Co.,Ltd.shows that the electromagnetic wave response characteristics of normal coal thickness change and thin coal area are consistent with the numerical simulation r

关 键 词：综采工作面 地质构造 电磁波透视 特厚煤层 场强 

分 类 号：TD163[矿业工程—矿山地质测量]