非共面瞬变电磁超前预报装置及解释方法研究

Research on Non-coplanar Transient Electromagnetic Advanced Prediction Device and Interpretation Method

瞬变电磁法超前预报主要采用共面同轴装置。共面同轴装置的发射与接收回线距离较近,存在电磁高次互感影响,一定程度上降低了探测效果;同时,由于将发射回线和接收回线紧贴工作面,对施工人员存在一定的安全隐患。提出一种非共面瞬变电磁超前预报装置及解释方法,计算了非共面装置条件下任意测点的电磁场响应,分析了不同测点对探测结果的影响,并利用Bz分量进行全域视电阻率定义。首先通过对电偶极子响应进行矢量叠加得到非共面装置瞬变电磁Bz分量响应;基于反函数原理利用Bz分量进行全域视电阻率定义;最后通过视电阻率曲线图与剖面图分析了工作面前方不同形态含水体对不同测点的视电阻率的影响。非共面瞬变电磁超前预报装置及解释方法能够有效探测工作面前方含水构造,在一定程度上保障施工人员安全。

The advance prediction of transient electromagnetic method is mainly based on coplanar coaxial device.The transmitting and receiving loops of the coplanar coaxial device are close to each other,which has the influence of high order electromagnetic mutual inductance,which reduces the detection effect to some extent.At the same time,because the transmitting loop and receiving loop are close to the palm surface,there is a certain safety hazard for the construction personnel.A non-coplanar transient electromagnetic advance forecasting device and interpretation method are presented.The electromagnetic field response of any measuring point under the condition of non-coplanar device is calculated,the influence of different measuring points on the detection results is analyzed,and the global apparent resistivity is defined by Bz component.Firstly,the transient electromagnetic Bz component response of the non-coplanar device is obtained by vector superposition of the electric dipole response.Based on inverse function principle,the global apparent resistivity is defined by Bz component.Finally,the effects of different forms of water in front of the palm face on the apparent resistivity of different measuring points were analyzed by using the apparent resistivity curves and profiles.The non-coplanar transient electromagnetic advance forecasting device and interpretation method can effectively detect the water-bearing structure in front of the face of the hand,and ensure the safety of construction personnel to a certain extent.