摘要
为了研究爆破切口高度对120 m高钢筋混凝土烟囱爆破拆除效果的影响,通过有限元软件Ansys LS-DYNA建立了整体式模型。对2.5、3.0、3.5、4.0 m和4.5 m的5种爆破切口高度方案进行数值模拟,比较分析在各切口高度下结构的倒塌形态及运动时程曲线,并与实际工程进行对比。对不同爆破切口高度下筒体的倒塌范围、后坐距离、倒塌速度和前冲距离等参数进行研究。结果表明:爆破切口高度过小,会导致筒体产生较大的前冲距离;随着爆破切口高度的增加,筒体破碎倒塌范围逐渐变小,但是筒体下坐距离越来越大。通过对比分析,确定最佳爆破切口高度为3.5 m。实际倒塌效果和数值模拟结果基本吻合,数值模拟结果可靠。
In order to study the influence of blasting cut height on the blasting demolition outcomes of a 120 m-high reinforced concrete chimney,a comprehensive model was established using finite element software Ansys LS-DYNA.Five blasting cut height schemes of 2.5,3.0,3.5,4.0 m,and 4.5 m were numerically simulated,and the collapse morphology and motion time history curves of the structure at each cut height were compared and analyzed.It was also compared with engineering practice.A study was conducted on factors such as the collapse range,recoil distance,collapse speed,and forward impact distance of the cylinder under different blasting cut heights.Results show that a too small blasting cut height can lead to a larger forward impact distance of the cylinder.With the increase of blasting cut height,the range of collapse of the cylinder gradually decreases,but the downward impact distance of the cylinder also increases.Through comparative analysis,the optimal height of the blasting cut is determined to be 3.5 m.The actual collapse outcomes are basically consistent with the numerical simulation results,and the numerical simulation results are reliable.
作者
高文乐
闫桐庆
孙鸿
寇玉明
刘卫东
徐明
段耀奎
GAO Wenle;YAN Tongqing;SUN Hong;KOU Yuming;LIU Weidong;XU Ming;DUAN Yaokui(College of Civil Engineering and Architecture,Shandong University of Science and Technology,Shandong Qingdao,266590;Poly Orica Management Co.,Ltd.,Shandong Weihai,264205;Transportation Bureau of Qihe County,Dezhou City,Shandong Dezhou,251100)
出处
《爆破器材》
CAS
CSCD
北大核心
2024年第4期45-51,57,共8页
Explosive Materials
基金
国家自然科学基金(51874189)。
关键词
钢筋混凝土烟囱
爆破拆除
切口高度
数值模拟
reinforced concrete chimney
blasting demolition
cut height
numerical simulation
