Design and Implementation of Blasting Demolition Scheme of Brick-concrete Chimneys in Complex Environment
Aiming at the blasting demolition condition of a brick-concrete chimney in a complex envi-ronment,a full investigation on the site is conducted and the directional dumping method for blasting opera-tion is decided.Through theoretical analysis and practical experience of similar projects,the blasting techni-cal parameters are calculated and optimized,highly symmetrical directional windows is set up,the direc-tional collapse direction of the chimney is controlled,and digital electronic detonators adopted to ensure that the chimney collapses along the center line.At the same time,the reasonable blasting parameters such as notch height,center angle,single consumption and amount of a simultaneous explosion are determined,and the safety of blasting operation is checked.In order to judge whether the blasting plan is reasonable,LS-DYNA numerical simulation software is used to pre-analyze the chimney tipping process,and observe its fi-nal movement process and final collapse direction.The simulation results show that the chimney collapses af-ter about 6.5 s,the collapse direction is consistent with the design direction,and the geometric analysis shows that the surrounding buildings have not been touched.In the process of on-site blasting demolition,it was found that the chimney fell along the design direction,no forward thrust phenomenon,and the harmful effects of blasting are effectively controlled,which provided a certain reference for similar demolition blast-ing projects.
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