摘要
湖北某水库导流洞放空钢管闸阀因故障无法正常开启,对水库运行造成了极大的安全隐患,需采取有效措施放空水库以便在汛前完成闸阀抢修。根据工程特点和抢险需求,设计采用聚能爆破方法对放空钢管进行切割,并对环形切割和局部矩形切割的两种聚能切割方案进行了比选。根据拟采用的聚能切割器材料和几何形状,利用ANSYS/LS-DYNA对聚能切割效果进行模拟,以穿透钢板后的射流速度作为聚能切割效果的评价指标,确定了该切割器(顶宽6 mm、底宽30 mm、高25 mm、聚能罩夹角90°)的最佳炸高为13~17 mm,并进行了爆破切割模拟试验。对实际工程中聚能切割器的起爆方式、安装施工及爆破切割效果等进行了较为详细的介绍。实践证明线装药密度为380 g/m的聚能切割器可成功切割壁厚14~16 mm的钢管,为类似抢险除险工程的爆破切割提供了可供参考的成功范例。
One wedge gate valve of venting steel pipe of a reservoir diversion tunnel in Hubei Provence failed to work properly,which caused a great safety threat to the operation of the reservoir.Therefore,effective measures should be taken to empty the reservoir in order to complete the rush repair of gate valves before the flood.According to the engineering characteristics and emergency needs,shaped charge blasting technique was selected to cut the vent steel pipe.and annular cutting and local rectangular cutting were designed and compared.According to the material and shape of shaped charge cutter,ANSYS/LS-DYNA and field tests were used to simulate and analyze the shaped charge cutting effect,where the fluidic velocity after penetrating the steel plate was taken as the evaluation index.Then the optimal blasting height of the cutter(top width=6 mm,bottom width=30 mm,height=25 mm,and liner angle=90°)was determined to be 13~17 mm.The practice showed that the steel pipe with a thickness of 14~16 mm can be cut successfully using the shaped charge cutter with a linear charge density of 380 g/m.Besides,the detonation mode,installation and blasting cutting effect of shaped charge cutter in practical engineering were introduced in detail,which provides a successful example for the similar engineering.
作者
曹昂
赵根
黎卫超
姚二雷
CAO Ang;ZHAO Gen;LI Wei-chao;YAO Er-lei(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)
出处
《爆破》
CSCD
北大核心
2021年第2期147-152,共6页
Blasting
基金
国家自然科学基金面上项目(52079009)
中央科研业务费项目(CKSF2019477/YT)
中央科研业务费项目(CKSF2019193/YT)。
关键词
聚能爆破
切割钢管
爆破设计
数值模拟
shaped charge blasting
steel pipe cutting
blasting design
numerical simulation
