烟囱定向爆破拆除前冲及塌落触地振动研究  

Research on Forward Thrust and Ground Impact Vibration of Chimney Demolition by Directional Blasting

作　　者：费鸿禄 王帅 钱起飞 FEI Hong-lu;WANG Shuai;QIAN Qi-fei(Blasting Technology Research Institute,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学爆破技术研究院,阜新123000

出　　处：《爆破》2021年第3期95-103,共9页Blasting

摘　　要：烟囱定向爆破拆除的前冲决定着烟囱倒塌范围和塌落振动阈值,为了探讨烟囱定向倾倒的前冲机理,基于钢筋混凝土烟囱定向爆破倾倒力学分析,考虑烟囱的3种触地姿态,分析烟囱前冲作用规律,得出烟囱定向爆破倾倒前冲距离及倒塌范围的计算公式;同时在此理论研究基础上,结合工程实例分析烟囱塌落触地振动响应特征,对比验证理论推导的准确性和合理性。研究结果表明:建立的烟囱前冲过程分析理论模型可较好的对烟囱的前冲过程进行描述,且该理论模型计算结果偏于保守,可为类似爆破工程安全防护设计提供参考;并且在实际拆除工程中,由于难以精确获取支撑部位的摩擦系数,将判据一作为烟囱发生前冲时的力学依据更为合理,在前冲分析的基础上对烟囱的塌落触地振动进行研究更为可靠。The forward thrust of the chimney demolition by directional blasting determines the collapse range and the threshold of collapse impact vibration of the chimney.In order to find the forward thrust mechanism of the directional toppling of chimney,mechanical analysis was conducted by considering three touchdown postures of a reinforced concrete chimney,which leads to the calculation formulas for the forward thrust distance and collapse range of the directional blasting of the chimney.At the same time,the characteristics of the ground impact vibration induced by the chimney collapse was analyzed to verify the accuracy and reasonableness of the previous theoretical derivation based on engineering examples.The research results show that the established theoretical model can describe the chimney forward thrust process very well.And the calculation result can provide a reference for the safety protection design of similar blasting projects due to its conservation.In addition,it is more reasonable to use criterion 1 as the mechanical basis when the chimney has a forward thrust because it is difficult to accurately obtain the friction coefficient of the supporting parts in actual demolition projects.And it is also more reliable to study the impact vibration of the chimney on the basis of the forward thrust analysis.

关 键 词：钢筋混凝土烟囱 定向爆破拆除 前冲 触地姿态 塌落触地振动 

分 类 号：TU746.5[建筑科学—建筑技术科学]