煤矿采空富水区瞬变电磁快速成像技术
Research on Transient Electromagnetic Fast Imaging in Water Rich Area of Mine Goaf
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摘要: 为快速准确地探测煤矿井下巷道前方的采空富水区,基于MATLAB编程将瞬变电磁仪器获取的二次场感应电压Vz(t)转换为垂直磁场Hz(t)来快速计算全区视电阻率值,根据“烟圈”理论计算视深度,形成视电阻率拟断面图,实现探测过程中的视电阻率快速成像;并通过多层介质地电模型正演和井下掘进工作面的探测实例观察其效果。模型计算和实例应用表明:由感应电压转换为垂直磁场求解全区视电阻率具有计算精度高、速度快的优势;井下现场快速视电阻率成像,可实现对富水异常的初步解释,现场及时复测异常,有利于提高探测的准确性。Abstract: To quickly and accurately detect the goaf rich water area in front of the coal mine roadway, MATLAB program is used to convert the secondary field induced voltage Vz(t) obtained by TEM into vertical field Hz(t)to calculate all-time apparent resistivity quickly. The apparent depth is calculated according to the “smoke circle” theory to form a pseudo section diagram of the apparent resistivity, so as to realize the fast imaging of the apparent resistivity in the detection process. The effect is observed through the forward modeling of multi-layer dielectric geo-electric model and the detection of driving face. The calculation of the model and the application of an example show that the conversion of the induced voltage to the vertical magnetic field has the advantages of high accuracy and high speed in calculating all-time apparent resistivity; the fast apparent resistivity imaging of underground site can realize the preliminary interpretation of the water rich anomaly, and timely retest of the anomaly on site is conducive to improving the accuracy of detection.
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