MECHANICAL ANALYSIS AND APPLICATION OF STRUCTURE CONTROLLED BLASTING DEMOLITION

A structure controlled blasting mechanical model which based on the kinematics and dynamics theory was developed for researching the mechanical characteristic of collapsing structure under constant restriction.And the fact that, the uncoupled node system and its generalized coordinate are based on the instantaneous imaginary displacement at each stage time, was first put forward in this paper. Based on the finding,the accurate blasting sections and their delay time could be defined by calculating and analyzing the node freedom degree. And moreover, the collapsing beam and slab were converted into a forced vibration system by combining control-blasting time lag with structure load distribution,responsible for the building structure collapsed and disintegrated more completely,and a cushioning effect on ground.The engineering practical result showed that the mechanical analysis was correct and could be used for theoretical basis of computer-aided programming and dynamic simulation of blasting demolition.