Wave field characteristics of seismic survey in coal mine roadway

In order to study the wave field characteristics of seismic survey in coal mine roadway,and distinguish different type of waves in the wave field,with the staggered-grid high order finite difference wave field simulation method,this papar simulates the elastic wave field stimulated with point-source or plane wave source in the coal mine roadway.By the wave field analysis,it indicated that in the common point gather the waves not only have various waves of conventional seismic,but also have multi-reflection and multiple refraction propagating between the top interface and the lower interface,which are the main interference wave.In the seismic records of plane wave source the cavity underneath the roadway shows as a obviously unusual “candied fruit".The result of wave field analysis provided a important basis for the seismic survey method and a effective way to estimate possibly achieved regarding effect.