| With the increasing of urban construction (structures) blasting projects, growingattention has been paid to the harm which is caused by slump touchdown vibration, thestudies about slump process、touchdown process、touchdown mechanism and effects ofseismic waves on the surrounding environment are not comprehensive and thorough.According to the theoretical analysis and numerical simulation in this paper, we not onlyhave studied touchdown vibration of the blasting of buildings and urban viaducts, butalso have analyzed security and influence of pipelines which have a certain degree ofsignificance of similar projects.The numerical simulation of blasting of a certain building shows that there aremultiple peaks of blasting impact action on the ground, it will dissipate the totaldestructive energy and make the impact multi-peak fluctuations. Accumulation rangeafter the building collapse is1.5times of the buliding height away from the right side ofthe building. Dynamic response of the underground tunnel where is close to the side ofthe building is the biggest.According to the characteristics that blasting large viaduct collapse affected a widerange of shock and vibration, we have proposed touchdown vibration SEMI simplifiedcalculation model based on the theory of Conservation of Momentum and improved theestimation accuracy. We have described security controls of urban blasting emolition andmade security theoretical analysis and numerical simulation analysis of the groundpipelines and underground pipe network which is in it. At the same time, we have givenout research methods of protection and protective measures of urban blasting emolitionand analyzed the damping effect under the protection. We have had real-time datamonitoring for viaduct blasting. We finally draw the relevant conclusions of bridgecollapse touchdown vibrating through the analysis of blasting and bridge collapse groundpeak vibration, frequency, hold time, and response spectrum characteristics. |
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