Study on Technology of Comprehensive Geophysical Method Exploration of Mine Goaf and Water Accumulated Area

According to problems of the mine water inrush accidents frequently occurred in mining goaf, the shallow 2D seismic and method transient electromagne tic method were applied to study the comprehensive geophysical exploration on the mining goaf distribution scope and the water accumulation conditions.The results sh owed that the shallow 2D seismic method could clearly reflect the reflected wave variation features of the seam.A complete seismic event of the seam was stable and C ontinued and the seismic event of the mining goaf was discontinuous, distortion or no obvious reflection.The features of a junction between a normal seam and goaf var ied obviously and an effect of the set goaf boundary and scope would be good and the resolution would be high.With a detail analysis on the survey line repeated area of the shallow 2D seismic and transient electromagnetic, taking the goaf scope set with the shallow 2D seismic as a base, the apparent resistivity threshold scope of th e transient electromagnetic method in the normal seam, goaf and goaf water accumulated area was determined and could be applied to guide the explanation work of ot her survey line. The transient electromagnetic would specially reflect sensitively to the low resistance and could judge the water accumulation in the goaf based on the V ariation of the resistivity and could effectively make up the limit of shallow 2D seismic method hard to judge the water accumulation in the goaf. The advantage of the sh allow 2D seismic and transient electromagnetic method were used fully, the survey effect of the goaf and water accumulation condition could be improved.