河南理工大学学报（自然科学版）2024，Vol.43Issue(5)：28-35,8.DOI:10.16186/j.cnki.1673-9787.2023060044
灰岩矿溜井开挖支护与降段爆破参数优化
Optimization of parameters of excavation support and down-section blasting in limestone ore pass
摘要
Abstract
The method of"ore storage down-section"is a technique in which the down-section extends with the progression of open-pit mining.Objectives The stability of the chute's shaft wall is a crucial aspect during the down-section process,but the internal state of the chute is invisible.Therefore,it is particularly impor-tant to study the appropriate support mode for the wellhead before down-section blasting and to optimize the blasting parameters for stability during the down-section process.Methods Based on a limestone mine chute,a theoretical analysis was conducted to assess the impact on chute wall stability.The stability of the chute wall was studied before and during the blasting down-section.Numerical simulations were employed to investigate the stability of the chute wall under different support conditions after excavation and through mul-tiple blasting events.Results The findings revealed that the impact degree of disturbances caused by blast-ing on the wellhead and shaft wall was negatively correlated with the distance between the shaft and the blasting center.The stress distribution and failure patterns of the chute wall after excavation and during the blasting down-section were identified,leading to the determination of a more reasonable wellhead support method.Conclusions Supporting the shaft head of the limestone mine with C40 grade concrete could effec-tively mitigate the damage to the surrounding rock caused by vibrations from daily blasting.The optimal pa-rameters identified included a resistance distance of 3.5 m for the auxiliary hole chassis,a hole distance of 3.5 m,and a row distance of 3.5 m.These findings offered a theoretical foundation and reference value for enhancing the safety of the blasting down-section process.关键词
溜井/降段/爆破参数/井口支护/井壁稳定性Key words
chute/down-section/blasting parameter/wellhead support/wall stability分类
矿业与冶金引用本文复制引用
牛帅,刘少伟,樊克松,李小鹏,郭泽政..灰岩矿溜井开挖支护与降段爆破参数优化[J].河南理工大学学报（自然科学版）,2024,43(5):28-35,8.基金项目
国家自然科学基金资助项目(52074102) （52074102）
辽宁省自然科学联合开放基金资助项目(2022-KF-23-08) （2022-KF-23-08）
河南省重点研发与推广专项项目(232102221034) （232102221034）
