Application of EH4 magnetotelluric method in detection of goaf in medium and deep coal seams
In order to identify the goaf and water accumulation distribution near the No.916 and No.917 working faces of a certain mine in Qipanjing,Ordos,EH4 magnetotelluric method was used to detect the area.By understanding the terrain and geological data of the ar-ea,analyzing the electrical response characteristics,conducting interference tests and parameter tests research,and then conducting on-site construction layout,conducting interior data processing and analysis,and interpreting the profile and plane results.The results showed that the consistency between the electrodes and magnetic rods was good after testing.It was determined to use an electrode dis-tance of 40 m and 8 acquisition times,and the gain size was determined based on the actual signal size of the measurement point.After removing interference signals,static correction,and reasonable interpretation,one weak high resistance anomaly(without water content)and one weak low resistance anomaly(with weak water content)were circled.The analysis showed that both were fault fracture zones,and no obvious goaf or water accumulation abnormal areas were found.The expected exploration purpose was basically achieved.
EH4 magnetotelluric methodmedium and deep coal seamdetection of goafdetection of waterlogged areas
万方数据
维普
