采用网络并行电法仪进行煤矿底板动态监测

Application of Network Parallel Electrical Instrument on Dynamic Coal Floor Monitoring

埠村煤矿9-1煤的条带开采方法,其安全控制因素是如何确定工作面合理尺寸,虽然理论与统计方法可提供工作面的安全尺寸,但因工作面条件的复杂性,实际生产中仍需对工作面底板的突水隐患进行监控。为此本次实测工作中使用网络并行电法仪,沿巷道全岩段工作面一侧布置了48个电极,分别在第5条带切眼及上出口(风巷),并采用AM法进行数据采集,B和N极都置于无穷远处。通过检测开采活动中的视电阻率响应、自然电场响应及电流响应,发现网络并行电法仪采集的电位、电流数据能够实时反映底板岩层变化情况,其由反演计算的底板真实电阻率值能准确判断底板岩体的破坏深度;采用自然电场和一次场特征进行分析,对于检测工作面底板破坏程度具有明显效果。实践表明利用网络并行电法中的自然电位和视电阻率、真实电阻率可有效地判断底板破坏带的变动,准确地预测煤矿突水危险。

The partial extraction is used in No.91 coal seam, Bucun coalmine; its safety control factor is how to define the reasonable size of working face. Although the safe size of working face can be come from theoretical and statistical methods, but because of complexity of face conditions, hidden trouble of face floor water bursting is still need to be monitored in practice. Thus the network parallel electrical instrument （NPEI） is used, 48 electrodes are laid out along the hard heading working face side,at fifth strip open- off cut, outlet （wind way） respectively. Data acquisition is using AM method, while B and N as infinite electrodes. Through apparent resistivity, natural electric field and current responses in mining activities have found that the potential and current data collected by the NPEI can reflect floor strata changes real-timely, its inverse modeled f/oor true resistivity can estimate floor rock mass destructive depth correctly. The analysis through natural electric field and primary field characteristics has obvious effect on working face floor destructive extent monitoring. It is obvious that to use spontaneous potential, apparent resistivity and true resistivity collected by NPEI can judge floor destructive zone change effectively and predict coalmine water bursting hazard with accuracy.