摘要
为了揭示聚能管装药爆破的细观机理,基于数值计算的可重复性及经济型,提出了采用数值模拟的方法,对聚能管不耦合装药预裂爆破进行研究.在相邻炮孔中心处,应力波发生叠加,有效应力峰值为93MPa;切缝方向孔壁的有效塑性应变为8.2%,为管壁外侧受保护孔壁的2倍.结果表明:聚能管对能量传播的导向以及对侧面岩壁的保护有显著作用.采用现场试验,对模拟结果进行验证.聚能管预裂爆破,破碎块度均匀,断面平整光滑,半眼痕率达到100%.
Numerical simulation was used to study the microscopic mechanism of blasting with a cutting seam cartridge.The method was adapted to pre-splitting blasting with decoupled charges.Stress waves are predicted to overlap at the centers of adjacent boreholes.Peak stress values of 93 MPa are predicted.Plastic strain in the cutting area is 8.2%,which is twice the strain on the protected side.A binding-energy-tube has a remarkable effect on energy propagation and protection of the sidewall.In-situ experiments validated the simulations.Uniform fragmentation and a smooth cross-section were obtained with cutting seam cartridge blasting.The half-hole mark ratio is as high as 100%.Simulations and experimental results both provide a guide for the improvement of pre-splitting blasting techniques.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2010年第5期631-635,共5页
Journal of China University of Mining & Technology
基金
国家高技术研究发展计划(863)项目(2007AA06Z131)
国家自然科学基金项目(50774086)
“十一五”国家科技支撑计划重点项目(2008BAB33B04-3)
关键词
预裂爆破
数值模拟
试验研究
不耦合装药
聚能管
presplitting blasting
numerical simulation
experimental research
decoupling charge
binding energy tube