金属体支护下煤层工作面瞬变电磁探测技术研究

依据物理模拟相似性准则,采用物理实验模拟和井下试验相结合的方法,研究了工作面侧帮工字钢和锚网两种金属支护体的瞬变电磁响应特征和规律。研究结果表明:工字钢支护产生的瞬变电磁电位响应最强,金属锚网支护产生的瞬变电磁电位响应次之,无金属体支护下的瞬变电磁电位响应幅值最小。根据不同金属支护体的瞬变电磁响应特征,从矿井瞬变电磁法视电阻率计算公式推导出煤层工作面金属支护体的影响校正数学模型,并提出了相应的数据处理技术。该技术有效地避开了金属支护体的干扰,减少了假低阻异常赋水体的出现。

Study on Transient Electromagnetic Detection Technology for Coal Face Supported by Metal Support Body

Based on similarity criterion of physical simulation,study was made on the transient electromagnetic potential response characteristics and law of the working face side wall supported by I-beam and anchor net by using the combing method of physical experimental simulation and the underground test.The study results showed that the transient electromagnetic potential response produced by I-beam was the strongest,followed by the metal anchor net,and the transient electromagnetic potential response of the working face supported by no-metal body was the minimum.An influencing calibration mathematical model for the working face supported by metal body was deduced from the apparent resistivity calculation formula of the mine transient electromagnetic method according to the transient electromagnetic response characteristics of different metal support body,and relevant data processing method was proposed.This technology can effectively avoid the interference of metal support body and reduce the emergence of false low-resistance abnormal area with rich water.