反向双切口爆破拆除楼房切口参数研究  

Cut Parameter in Explosive Demolition of Building with Two Reverse Cuttings

作　　者：魏晓林[1] 

机构地区：[1]广东宏大爆破股份有限公司,广州510623

出　　处：《爆破》2013年第4期99-103,共5页Blasting

摘　　要：双切口反向倾倒拆除楼房,一般是上切口闭合,形成双体双向运动,上体翻倒,下切口再闭合.由此,应用了多体动力学,考虑了双体在下体顶面翻倒的双体运动和阻尼能耗,推导了上体在下体上翻倒时,楼房上体高宽比η2分别与上、下切口高与宽比和土切口底高与楼宽比λ2、λ1和lj的关系,即λ2≈0.4 ～0.7、λ1≈0.6～0.8、lj=1,η2≥1.45时,上体可在下体上翻倒.具体η2和λ2关系,可根据主惯量比kj和λ1从算图中插值得到,相应下切口起爆时差可参考上切口闭合时间t,从另一算图中插值相似时间t＇得到.When building was demolished by two cuts in reversed direction,two body movements were usually formed since upper cut closed.Based on the multi-body dynamics and considering the damp dynamic wastage rolling of upper body on lower body,when upper body was toppled,the relationship between ratio of upper body height to building width （η2） and λ1（ratio of down cutting height to width）,λ2 （ration of upper cutting height to width） andlj （bottom height to building wide）were deduced.Under the conditions,namely,λ2 ≈ 0.4 ～0.7,λ1 ≈ 0.6 ～ 0.8,lj =1 and η2 ≥ 1.45,the upper body on lower body could be toppled.However,the relationship between and can be found by numerical value,kj,λ 1 inserted from calculating figures.Corresponding firing time interval between upper and lower cuts could be referred to close time t of upper cut and obtained with similar time t＇ inserted from another calculated figure.

关 键 词：爆破拆除 楼房 反向多切口 切口参数 

分 类 号：TU746.5[建筑科学—建筑技术科学]