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《Blasting》 2016-03
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Discussed on Key Parameters of Folding Explosive Demolition of High High-rise Building

JIA Yong-sheng;XIE Xian-qi;YAO Ying-kang;SUN Jin-shan;Wuhan Explosion & Blasting Co Ltd;Faculty of Engineering,China University of Geoscience;  
The folding blasting has become the main method to demolish the high-rise building,some technique issues of unidirectional and bidirectional folding blasting technique were discussed based on the analysis of some projects and some simulation on multi rigid body. The results show that,the blasting cuts of unidirectional folding blasting is 2 ~ 3,and the ignition order is from up to down,meanwhile,the delayed time between two blasting cuts should shorter than the closure time of upper gap. The blasting cuts of bidirectional folding blasting should make the height to width aspect ratio of building section between two gaps bigger than 1,and the location,height and direction of the blasting cuts should be considered based on the collapse space firstly. Besides,the ignition order also be from up to down,and the optimum delayed time should be chosen according to the gap conditions and collapse conditions of the building. In engineering practice,the unidirectional or bidirectional folding blasting models should be chosen considering the spacing and height to width aspect ratio of building.
【Fund】: 武汉市创新人才开发资助项目;; 国家自然科学基金资助项目(51379194;41102196)
【CateGory Index】: TU746.5
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