STUDY ON THE FRONT AND BACK SHOOTING TECHNOLOGY IN BLASTING DEMOLITION AND ITS APPLICATION

摘要

In the process of building demolition blasting, all the blast holes are initiated. However, sometimes the site to be burst can be not fully blasted. After explosives explode, load-bearing walls are left half or several holes and meanwhile the residues continue playing a supporting role. The accident in which buildings are blasted but remain standing occurs now and then. According to the characteristics of dynamic and static stress fields in single surface blast hole charge among shoot and back shooting, analysis is made about blast stress field of two opposite free faces in the wall. The results show that: using the methods of the front and back shooting methods can make full use of energy as well as improve the effect of blasting at the site to be burst.