Seismic　Tomography　Technique　for　Determining Damage　Range　in　Bed　Rock　Blasting

A　new　method　for　determining　the　rock　damage　range　is　presented　for　the　first　time　on　the　basis　of　combining　seismic　tomography　technique　and　elastic　wave　method.　　In　addtion,　the　critical　vibration　speed　in　the　jointed　rock　mass　in　Three　Gorges　Project　is　studied　with　the　help　of　the　attenuation　equation　for　blasting　seismic　wave.