Study On Influence Of Tunnel Blasting Vibration On Ground Particles And Adjacent Buildings

At the meantime of widespread application of the blasting technology, blastingvibration effect which is regarded as head of blasting hazards has been commonlyfocused with the blasting surroundings and people’s consciousness for environmentalprotection. Based on Qingdao subway tunnel，by virtue of analyzing the result ofmonitoring measurement on vibration effect，with the way of numerical simulation，the thesis studies the influence of tunnel blasting vibration on ground particles andadjacent buildings. Here are some conclusions:(1)Peak velocity of ground particle is exponential decreased with the increase ofratio distance, and the maximum value of peak velocity appears in vertical directionwith high probability.(2) Using the principles of statistics, the thesis concludes attenuation formulas ofpeak velocity on3different construction sites. By using these formulas，people canmodify the parameter of blasting to reduce blasting vibration effect.(3) The main vibration frequency of ground particle is in range of20～70Hz,butno strict link between main vibration frequency and ratio distance is found.(4) In horizontal direction of building, the velocity is decreased with the increaseof ratio distance, while in vertical direction, the velocity is increased to the height ofthe building. Protection work should be focused on the up floor of buildings.(5)For single particle of building，the horizontal velocity is not much higher thanvertical velocity. So, the vertical fortification of building is as important as horizontalfortification.(6)For low storied buildings, its velocity is always lower than the velocity ofnearby ground particles, and their vibration frequencies are similar. So, we canmonitor the nearby ground particles to characterize the blasting vibration effect onbuildings.