摘要
在地下金属矿山开采过程中,凿岩爆破产生的爆破振动是导致围岩破裂和充填体破坏的重要因素。为研究进路式开采充填体内爆破振动波的传播规律,以焦家金矿为工程背景,开展了现场爆破振动监测。通过合理的测点布置,结合萨道夫斯基经验公式,比较研究了传播介质、有无充填体及充填体的厚度对爆破振动传播规律的影响。结果表明:与岩体内的爆破振动传播相比,爆破振动在充填体内传播时萨道夫斯基公式中的场地系数K、衰减系数α均明显增大;相比无充填体条件,采场底部充填体的存在会使爆破夹制作用减小,从而导致场地系数K和衰减系数α变小;充填体厚度越厚,场地系数K越小,而衰减系数α基本不变。
In the process of underground metal mine mining,blasting vibration caused by drilling and blasting is an important cause of surrounding rock fracture and filling body failure.In order to study the propagation law of blasting vibration in the filling body during the drift mining,the in-situ blasting vibration monitoring was carried out in the Jiaojia Gold Mine.Based on the reasonable arrangement of measuring points and Sadovsky’s empirical formula,the influences of the propagation medium,the existence of filling body and the thickness of the filling body on the propagation law of blasting vibration were compared.The results show that,compared with the blasting vibration propagation in the rock mass,the site coefficient K and attenuation coefficientαof the Sadovsky formula increase significantly when the blasting vibration propagates in the filling body.Compared with the condition without filling body,the existence of filling body at the bottom of stope will reduce the production cost of blasting clip,which leads to the reduction of site coefficient Kand attenuation coefficientα.In addition,with the increase of the thickness of filling body,the site coefficient Kdecreases,but the attenuation coefficientαis basically unchanged.
作者
薛田喜
徐鸿鹏
张旭飞
郝琪琪
XUE Tianxi;XU Hongpeng;ZHANG Xufei;HAO Qiqi(Jiaojia Gold Minine,Shangdong Gold Mining(Laizhou)Co.,Ltd.,Laizhou,Shandong 261441,China;Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,Shenyang,Liaoning 110819,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第7期42-49,共8页
Mining Research and Development
关键词
充填体
爆破振动
场地系数
衰减系数
进路开采
Filling body
Blasting vibration
Site coefficient
Attenuation coefficient
Drift mining
