Numerical simulation and construction design of blasting demolition of a 50 m brick chimney
Aiming at the demolition condition of a 50 m brick structure chimney under complex environment,designers use theoretical analysis method to determine the blasting notch parameters of the chimney,and use delay blasting to open directional window and adopt dense empty holes instead of positioning window to control the blasting direction.At the same time,the harmful effect of blasting is estimated.In order to verify the rationality of the blasting scheme,the designers use numerical simulation technology to simulate and analyze the collapse process of the chimney.The spring unit is defined among the brick structural units to restore the bond-slip effect between the units.The simulation results show that the chimney basically collapses along the design direction and the phenomenon of cylinder sitting down and middle breaking appears.In the on-site blasting process,the chimney collapse process lasts for 9.0 s,which is basically consistent with the simulation result.The touchdown dissociation is complete,and the harmful effects of blasting are effectively controlled,which provides a reference for similar projects.
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