煤矿井下瞬变电磁超前探测数值模拟研究  

Numerical simulation of transient electromagnetic advance detection in coal mine

作　　者：姚伟华 王鹏 郭恒 王信文 安又新 YAO Weihua;WANG Peng;GUO Heng;WANG Xingwen;AN Youxin(Xi＇an Research Institute of China Coal Technology ＆ Engineering Group,Xi＇an 710077,China)

机构地区：[1]中煤科工集团西安研究院有限公司,西安710077

出　　处：《物探化探计算技术》2018年第3期353-357,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金重点项目(51139004)

摘　　要：从回线源瞬变电磁法三维有限差分正演算法出发,与均匀半空间解析解作比较,验证了数值模拟算法的正确性。利用该正演算法分别研究了巷道、背景地层电阻率、掘进机对矿井瞬变电磁超前探测响应的影响。结果表明,背景地层电阻率越低,响应幅值越强,巷道影响越显著;掘进机距探测线框超过10m时,影响幅度明显变小;矿井瞬变电磁法的方向性具体表现为在不同的探测角度上测量的异常幅度不同。通过研究这些影响因素,对分析矿井瞬变电磁超前探测资料具有重要的借鉴作用。In this paper,the validity of the three-dimensional forward algorithm is proved comparing with the finite difference time domain response respectively with the homogeneous half space analytical solution.Based on the forward algorithm,the influence of roadway,background formation resistivity,the boring machine and the detection angle on the transient response of the mine transient are simulated.The results show that the lower the resistivity of the background formation,the stronger the response amplitude and the more significant the roadway influence.When the boring machine is more than 10 m,the influence is obviously smaller.The directionality of the mine transient electromagnetic method is manifested in the fact that the abnormal amplitude measured at different detection angles is different.By studying these factors,it is an important significance for mine transient electromagnetic advanced detection data.

关 键 词：瞬变电磁法 超前探测 时域有限差分法 数值模拟 

分 类 号：P631.3[天文地球—地质矿产勘探]