Study On Safety Impact Of Adjacent Buildings Due To Deep Excavation Blasting Of The Underlying Bedrock On River Island

With the rapid development of subway, blasting of deep foundation pit is becoming increasingly common. However, there still exist some practical issues which are urgently to be solved, for example, the layout of blast hole in deep foundation pit blasting excavation, the control of the maximum explosive, and the security effect to the surrounding of deep foundation pit blasting and control measures. In this paper, we take the numerical calculation as a means of prediction and combine them with the on-site engineering data at the same time. Then we study on the regularity of the adjacent buildings under the effect of blasting. The main contents are as follows:(1)Based on the underlying bedrock blasting of deep foundation pit of JuZiZhou, we carry on two numerical simulations with different layout of blasthole, then we compare blasting vibration law of the pit floor, the diaphragm retaining walls and the adjacent buildings under different layout of blasthole.(2)Based on the on-site engineering data, we analyze the attenuation law of blasting vibration and the variation law of vibration velocity of building structures units at the geological conditions of JuZiZhou by means of the PPV regression analysis and spectrum analysis. In the meantime, combined with the on-site engineering data, comparative analysis of the effect of blasting vibration and blasting vibration law has been carried on(3)Based on blasting vibration regulation by numerical calculation and Field Measurement Analysis, we analyze the parameters of the maximum explosive of primary explosive in the JuZiZhou Station Excavation Blasting and evaluate the impact of the security blasting vibration on adjacent building. Finally the controlling measures are proposed on the basis of all the above.