摘要
明晰钢筋混凝土构件在钻孔爆破作用下的损伤特性是爆破拆除量化设计和爆破效果定量评价的前提。依托某深基坑支撑梁爆破拆除工程,通过现场爆破试验和应变测试获取了单孔爆破条件下炮孔孔壁、炮孔近区以及中远区的动应变特征,然后采用爆炸动力学相关理论计算了炮孔孔壁压力、损伤因子和破坏分区特征,最后采用LS-DYNA软件对现场试验进行了数值模拟。研究结果表明:钢筋混凝土构件在孔内炸药爆炸应力波和准静态气体共同作用下,炮孔孔壁及近区混凝土应变呈“先压后拉”特征,应变实测曲线与数值模拟结果一致,拉压峰值基本接近;钢筋混凝土构件的损伤分布呈非线性递减,近区损伤衰减快,远区缓慢且趋于0,数值模拟和理论计算的破坏粉碎区和裂隙区范围比较接近,绝对值相差10%左右;本文采用的理论分析模型和数值模型可满足炮孔近区损伤特征分析。研究成果可为钻孔爆破条件下钢筋混凝土构件的破碎与损伤分析提供参考。
Revealing the failure mechanisms of reinforced concrete beams and columns under drilling and blasting conditions is essential for achieving precise blasting demolition design and accurate assessment of blasting effects.Based on an actual deep foundation pit support beam blasting demolition project,this research investigated the dynamic strain characteristics of the hole wall,near-field zone,and the mid-to-far zones under single-hole blasting conditions through field blasting tests and strain measurements.Through explosion dynamics theory,the study calculated borehole wall pressure,damage factors,and damage zoning characteristics.Results demonstrate that under combined blast stress waves and quasi-static gas effects,reinforced concrete support beams exhibit first compression and then pull′strain characteristics in borehole walls and near-field concrete,with measured strain curves closely aligning with numerical simulation results at both tensile and compressive peaks.The damage distribution in reinforced concrete beams subjected to blasting exhibited a nonlinear attenuation pattern,characterized by rapid decay in the near-field region and gradual reduction to zero in the far-field region.Both numerical simulations and theoretical calculations demonstrated good agreement in the extent of the crushing and fracture zones,with approximately 10% absolute deviation between the two methods.The theoretical and numerical models developed in this study effectively analyze blast-induced damage zoning,with findings offering valuable references for assessing damage characteristics and affected areas in reinforced concrete components during demolition blasting.
作者
姚颖康
康怡泽
章强
张程
王威
YAO Ying-kang;KANG Yi-ze;ZHANG Qiang;ZHANG Cheng;WANG Wei(State Key Laboratory of Precision Blasting,Jianghan University,Wuhan 430056,China;Hubei Key Laboratory of Blasting Engineering,Jianghan University,Wuhan 430056,China;School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China;State Key Laboratory of Tunnel Engineering,Sun Yat-sen University,Zhuhai 519082,China;China Non-metal Materials Mine Engineering Co.,Ltd.,Nanjing,210000,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China;Wuhan Explosions and Blasting Corporation Limited,Wuhan 430056,China)
出处
《爆破》
北大核心
2026年第1期138-147,165,共11页
Blasting
基金
国家重点研发计划项目(2021-008)
国家自然科学基金资助项目(52478525)
湖北省中央引导地方科技发展专项(2025CSA014、2024CSA094)。
关键词
钻孔爆破
钢筋混凝土构件
爆炸荷载
破坏分区
drilling and blasting
reinforced concrete components
blast loading
damage zoning
