底部窑体约束条件下砖混结构烟囱爆破拆除设计  

Blasting Demolition Design of Brick-concrete Structure Chimney under Constraint of Bottom Kiln

作　　者：王刚 WANG Gang(Anhui Jiangnan Blasting Engineering Co.,Ltd.)

机构地区：[1]安徽江南爆破工程有限公司

出　　处：《现代矿业》2022年第11期270-274,共5页Modern Mining

摘　　要：针对底部窑体约束下高度风化砖混结构烟囱爆破拆除工况,通过充分分析烟囱本体结构与力学特点,并结合周边环境特征拟定合理爆破方案,确定了烟囱倒塌方向、缺口高度和爆破参数,并通过理论公式计算了爆破振动、飞石影响范围,制定了相应的爆破安全防护措施。为了验证爆破方案设计的合理性,采用ANSYS/LS-DYNA数值模拟软件,基于整体式建模方法建立烟囱三维有限元模型并施加缺口单元失效,模拟了烟囱倒塌效果。仿真结果表明,底部窑体对烟囱倒塌过程影响相对较小,烟囱沿设计方向倒塌。现场钻孔爆破后,烟囱倒塌冲击导致窑体顶部部分碎裂,烟囱整体未向两侧偏移,沿设计方向倒塌,筒体触地解离完全,爆破振动与飞石危害均在可控范围内。In view of the blasting demolition condition of highly weathered brick-concrete structure chimney under the constraint of the bottom kiln body,the collapse direction,notch height and blasting pa⁃rameters of the chimney are determined by fully analyzing the structure and mechanical characteristics of the chimney body and combining with the characteristics of the surrounding environment.The blasting vi⁃bration and the impact range of flying rocks are calculated through theoretical formulas,and the corre⁃sponding blasting safety protection measures are formulated.In order to verify the rationality of blasting scheme design,ANSYS/LS-DYNA numerical simulation software is used to establish a three-dimensional finite element model of the chimney based on the integral modeling method and apply notch element failure to simulate the collapse effect of the chimney.The simulation results show that the bottom kiln body has relatively little influence on the collapse process of the chimney,and the chimney collapses along the design direction.After the on-site drilling and blasting,the chimney collapse impact caused the top part of the kiln body to be broken,the chimney did not shift to both sides as a whole,collapsed along the design direction,the cylinder was completely separated from the ground,and the blasting vibration and flying rock hazards were within the controllable range.

关 键 词：高耸烟囱 底部约束 爆破拆除 数值仿真 

分 类 号：TU746.5[建筑科学—建筑技术科学]