高密度电阻率法对不同电极排列的分辨率响应研究

Study on resolution response of different electrode arrangements by high density resistivity method

高密度电阻率法不同电极排列以及异常体尺寸和位置关系对探测结果有不同的分辨率响应,探明不同电极排列对分辨率的响应,对于科学合理地解析地电信息所揭示的地下构造具有重要的指导意义.通过Ansys中APDL命令流的方式对不同排列方式以及异常体尺寸进行模拟,分析了α、β以及γ等电极排列对水平异常体、竖直异常体以及异常体尺寸与其相邻位置的关系对分辨率的影响.研究表明,温纳电极排列的电极信号强,而且对竖直方向具有较好的敏感性.偶极排列对水平方向具有较好的敏感性,但其信号强度较弱.异常体水平排列时,异常体之间的距离大于其尺寸,能较好的分辨出其位置关系;竖直排列时,高密度电法难以探测出其异常体之间的信息.T比值参数结合了β、γ排列信息,对地下信息具有更清晰的分辨率,但T比值参数对于竖直方向,分辨率较低.

The different electrode arrangements of the high-density resistivity method and the size and positional relationship of the anomalous body have different resolution responses to the detection results,exploring the response of different electrode arrangements to resolution has important guiding significance for scientifically and rationally analyzing the underground structure revealed by geoelectric information.Through the APDL command stream in Ansys,the different arrangement modes and the size of the abnormal body are simulated.The relationship between the electrode arrangement ofα,βandγand the horizontal anomaly,vertical anomaly and the size of the abnormal body and its adjacent position is analyzed.The impact of the rate.Studies have shown that the electrodes arranged by the Wenner electrodes are strong and have good sensitivity to the vertical direction.The dipole arrangement has better sensitivity to the horizontal direction,but its signal strength is weaker.When the anomalous bodies are horizontally arranged,the distance between the anomalous bodies is larger than the size,and the positional relationship can be better distinguished;when arranged vertically,the high-density electrical method is difficult to detect the information between the abnormal bodies.The T ratio parameter combines theβandγarrangement information to have a clearer resolution for the subsurface information,but the T ratio parameter has a lower resolution for the vertical direction.