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Guo Feng(China Academy of Railway Science,Beijing 100081)  
By processing the blasting vibration data actually measured around the long-length cartridge with the numerical calculation,the blasting vibration field was developed,making people having an overall view on the blasting vibration effect,so as to carry out safety protection in accordance with the actual condition of engineering blasting.It is believed from the analysis that,the vibration field around the long-length cartridge is composed of a series of vibration lines of concentric ellipse.Close to the cartridge,effected by the location factor,the major axis of the contour vibration lines is coincided with the axis of the cartridge,far away from it,the vibration is mainly influenced by the wave interference,the major axis is vertical to the axis of cartridge.Therefore,the calculation of the concentrated cartridge can not be used.
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