Abstract: In view of the effect of slope blasting and excavation in an open pit mine on the existing tunnel,the particle vibration velocity control standard of the surrounding rock is determined at 20 cm/s,with reference of the relevant standards and similar domestic engineering experience.The particle vibration of tunnel wall under the blast loading is monitored,and an installation scheme for measurement instrument is put forward.And the attenuation law of particle vibration at tunnel surrounding rocks is analyzed.The fitting coefficients of the vibration velocity attenuation at horizontal radial,horizontal tangential and vertical peak are 0.85 or above.Information feedback in time can contribute to optimizing the blasting parameters.Combined with numerical analysis,the vibration velocity of tunnel surrounding rock and the dynamic stress distribution rule are obtained.The peak value of particle vibration velocity at surrounding rock is 19 cm/s,which verifies the reliability of the estimated explosive quantity.The research provides security for the smooth construction.

Key words: Slope engineering, Blasting, Blasting vibration, Tunnel engineering