利用煤体破裂电磁信号进行局部震源定位方法研究  

A method to determine the location of local mine earthquake source by using coal fracture electromagnetic signal

作　　者：李成武[1] 杨威[1] 王启飞[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《地球物理学报》2014年第3期1001-1011,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(51274206)资助

摘　　要：准确预测煤岩破裂震源方位,确定采掘工作面重点灾害区域,可以使煤岩动力灾害防治措施更为有效.根据煤岩变形破裂电磁效应规律和电磁波基础理论,提出了一种利用电磁信号能量来确定局部震源方位的方法,并通过实验室定向接收实验和平煤十矿现场测试验证该方法的有效性.结果表明,电磁信号强度随着煤岩体应力状态变化而变化;两个正交天线接收的电磁信号能量分别与各自接收夹角余弦值的平方成正比,利用此比例关系可以确定震源的方位;电磁信号定位方法与静态指标法预测局部区域危险性具有较好的检验一致性.研究成果为煤岩动力灾害重点灾害区域的判定提供依据.The accurate prediction of direction of coal or rock fracture source and the determination of major disaster area can make prevention measures of coal or rock dynamic disasters more effective. Based on the electromagnetic effect regularity of coal or rock deformation and fracture and the basic theory of electromagnetic wave, a method to determine the location of local mine earthquake source using the energy of electromagnetic signal is proposed. The effectiveness of the proposed method is verified through electromagnetic radiation directional receiving experiment in laboratory and field test of mine earthquake location in No.10 mine of Pingdingshan Tian＇an Coal Mining Corp. Ltd. Results show that Electromagnetic signal intensity varies with the stress changes. The electromagnetic signal energy of two orthogonal antennas is respectively in direct proportion to the cosine square of their receiving angles. Thus, the location of source can be calculated according to the proportional relationship. Furthermore, Electromagnetic signal location method is consistent with static index method in predicting risk of local area. The research results can provide basis for the determination of major disaster area of the coal and rock dynamic disasters.

关 键 词：煤岩 电磁辐射 接收天线 矿震定位 

分 类 号：P631[天文地球—地质矿产勘探]