Study on the Dynamic Propagation Law of Excavation Blasting in Site Leveling Engineering
During the large-scale field leveling engineering blasting process with deep excavation and high embankment filling,the ground vibration will cause severe disturbance to the surrounding buildings.The study is based on a high embankment filling and deep excavation project in Shenzhen city,aiming to investigate the dynamic propagation characteristics of 76 mm,115 mm,and 140 mm borehole diameter explosive charges during the blasting process.The ground vibration velocity under the action of 76 mm and 115 mm borehole diameter explosive charges was measured,and the site coefficients K and α values were determined based on the Sadowski formula.A three-dimensional numerical model was created using finite element software Midas/GTS to analyze the propagation characteristics of vibration velocity and stress during the blasting process,and the numerical simulation results were compared with the measured fitting formula.The results indicate that the numerical simulation is in good agreement with the field monitoring results.The vibration velocity of the explosive charges with three different borehole diameters gradually stabilizes at a distance of 100 meters from the blast center,with horizontal vibration velocity greater than vertical vibration velocity,meeting the specifications requirements.The stress values of the explosive charges with three different borehole diameters attenuate rapidly within 50 meters from the blast center,showing significant differences,but the differences become smaller at 100 meters from the blast center,reaching a stable attenuation level.
site leveling engineeringvibration responseblasting loadingnumerical simulation
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