矿产保护与利用2024，Vol.44Issue(4)：1-8,8.DOI:10.13779/j.cnki.issn1001-0076.2024.04.001
孔间短延时起爆爆生裂纹扩展行为研究
Detonation Crack Propagation Behavior of Short Delay Blasting Between Holes
摘要
Abstract
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 when Δt increased to 80 μs,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.关键词
灰岩/RHT本构/孔间延时起爆/应力叠加/裂纹扩展Key words
limestone/RHT constitutive model/inter hole delay blasting/stress superposition/crack propagation分类
矿业与冶金引用本文复制引用
徐培良,侯克鹏..孔间短延时起爆爆生裂纹扩展行为研究[J].矿产保护与利用,2024,44(4):1-8,8.基金项目
国家自然科学基金项目(52064025) （52064025）
云锡公司新技术引进专项(YTDK2023010) （YTDK2023010）
