基于阻容网络的聚焦双频激电法精准探测正演模拟

为认识聚焦双频激电法煤巷综掘探测含水地质构造异常激电特征，减少传统阻容网络物理模型实验模拟系统误差，提高正演模拟测试精度，依据煤巷含水地质构造实际工况条件和聚焦效应探测机理，搭建地电测试探测模型及与其等效的阻容网络模型，利用Matlab软件Simulink组件中SimPowerSystems模块精准构建探测系统仿真电路模型。通过改变阻容网络模型参量，模拟含水地质构造探测视电阻率和视幅频率变化规律。仿真实验结果表明：随测点距掘进断面距离的增加，视幅频率逐渐增加，而视电阻率逐渐减小，在测点距掘进断面48m处，视幅频率达到19.7%，视电阻率达到571.5Ω·m，即测点越靠近含水异常体，其激电效应异常越为明显。

Forward simulation of accurate detection by focused dual-frequency IP method based on RC network

According to the actual working conditions of the water-bearing geological structures of coal roadway and the detection mechanism of focusing effect, the paper builds the geoelectric testing detection and its equivalent resistance-capacitance network model, and accurately constructs the simulation circuit model of the detection system by using the SimPowerSystems module in the Simulink component of MATLAB software in order to understand the abnormal IP characteristics of the water-bearing geological structures for comprehensive excavation detection in the coal roadway by focused dual-frequency IP method, reduce the system error of traditional RC network in the physical model experiment simulation, and improve the testing accuracy of forward simulation. By changing the parameters of the RC network model, the apparent resistivity and apparent amplitude of the water-bearing geological structures are simulated. The simulation results show that the apparent amplitude increases gradually, while the apparent resistivity decreases gradually with the increase of the distance between the measuring points and the excavation section. At the measurement point 48m away from the excavation section, the apparent amplitude reaches 19.7% and the apparent resistivity reaches 571.5 . That is, the closer the measuring point is to the water-bearing abnormal body, the more obvious the abnormal IP effect is.