摘要
为掌握逐孔起爆孔间延期时间对爆破破岩效果的影响规律,采用数值模拟手段,以某矿山灰岩为例,建立了双孔爆破数值模型,并标定了灰岩RHT本构模型的34个参数。模拟结果表明:逐孔起爆时,应力增强现象随着延期时间的增大而增大,但当Δt由0增大到80μs时,孔间叠加产生的应力增强可以忽略不计;先爆孔的裂纹扩展面积随着延期时间的增加而增大,后爆孔的裂纹扩展面积随着延期时间的减小而减小,孔间裂纹扩展的宽度随着延期时间的增加而增大。研究成果为数码雷管精确延时性能的推广应用提供了设计依据。
In order to understand the influence of the delay time between holes on the rock breaking effect of different rocks,a numerical model of double−hole blasting was established by means of numerical simulation using limestone from a mine as an example,and 34 parameters of the RHT constitutive model of limestone were calibrated.The simulation results showed that the stress enhancement phenomenon increased with the increase of delay time,but whenΔt increased to 80μs,the stress enhancement caused by the superposition between holes can be ignored.The crack propagation area of the pre−blasting hole increased with the increase of the delay time,the crack propagation area of the post−blasting hole decreased with the decrease of the delay time,and the width of the crack propagation between the holes increased with the increase of the delay time.The research results provide a design basis for the popularization and application of the precise delay performance of digital detonators.
作者
徐培良
侯克鹏
XU Peiliang;HOU Kepeng(Datun Tin Mine,Yunnan Tin lndustry Co.,Ltd.,Gejiu 661000,Yunnan,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)
出处
《矿产保护与利用》
2024年第4期1-8,共8页
Conservation and Utilization of Mineral Resources
基金
国家自然科学基金项目(52064025)
云锡公司新技术引进专项(YTDK2023010)。
关键词
灰岩
RHT本构
孔间延时起爆
应力叠加
裂纹扩展
limestone
RHT constitutive model
inter hole delay blasting
stress superposition
crack propagation
