Research On Parallel Electrical Detection Of Water-Rich Area Based On Adjacent Source Potential

With the development of coal mining in our country year by year to the deep,the threat of hidden danger of water damage of floor to the safety of coal mining in mine face continues to increase,so it is of great significance to find out the relatively water-rich areas of floor strata before mining.Therefore,aiming at this problem,this paper adopts the method of combining theoretical analysis,numerical simulation,physical simulation and field engineering application cases to conduct a systematic study on the detection technology of water-rich area by parallel electric method.The main conclusions are as follows:(1)According to the data characteristics of high signal-to-noise ratio of adjacent source potential value and low signal-to-noise ratio of ’ remote ’ potential value in the whole field potential of parallel electrical method,a three-pole device based on adjacent source potential is proposed to calculate the apparent resistivity value,which overcomes the shortcomings of the traditional Wenner three-pole device using the remote potential value to calculate the resistivity results.(2)The numerical simulation software was used to establish a three-dimensional geoelectric model with low resistivity anomalic bodies,and the apparent resistivity calculation effect of the Wenner tripole device and the neighboring source tripole device was compared.The results showed that the resistivity inversion results of the data extracted from the nearby source tripole device were more accurate,and had better resolution and stronger anti-interference when two anomalic bodies existed at the same time.(3)In order to verify the effectiveness and reliability of the device,the flume experiment is used to carry out physical simulation on the detection of water-rich area of the working face floor.The collected parallel electrical data are respectively used for the inversion calculation of the data extracted from the Wenner tripole device and the nearest source tripole device.The results show that both Wenner tripole and nearest source tripole devices can be used for water-bearing detection of working face floor when there is a single anomalous body.Compared with the Wenner tripole device,the nearest neighbor source tripole device has better anti-interference when the interference body is added into the model,and it can identify the abnormal body in the model more accurately.Electrical field detection was carried out on the working face of Pan Sidong mining area in Huainan,and data inversion was carried out with the nearest neighbor source three-pole device.The floor 3D electrical resistivity imaging results were obtained.Two low-resistivity abnormal areas were defined and interpreted as relatively water-rich areas,which were consistent with the actual drilling verification results,which better proved the feasibility and accuracy of the proposed method.It is of great guiding significance to the actual work of water prevention and control in working face.Figure [34] Table [2] Reference [90]...