摘要
为了评估露天矿岩石边坡的稳定性,研究爆破近区的岩石边坡对爆破振动的响应特征,以某露天矿爆破开挖为工程背景,运用理论分析及试验方法,研究了爆破振动波在边坡上传播的规律。运用FLAC3D软件建立边坡模型,分析了石边坡在爆破振动作用下的速度、位移的变化特征。研究表明:高边坡的测点竖直方向振动速度相对于水平方向较大,爆破振动强度并没有随着正高程的增大而呈现无限放大趋势,而是达到一定高程差时才会呈现出爆破振动的放大效应;边坡的竖直方向与水平方向发生小部分变形,但坡底水平位移变化幅度较大且为集中,降低了边坡的稳定性。
The safety of rock slopes affects the economic benefits of mines.In order to improve the stability of rock slope in open-pit mine,the response characteristics of rock slope near blasting area to blasting vibration are studied.Taking blasting excavation of an open-pit mine as engineering background,the location of measuring points on the slope is determined by theoretical analysis and on-site geological conditions,and the propagation law of blasting vibration wave on the slope is studied.The slope model is established by FLAC3 Dsoftware,and the change characteristics of velocity and displacement of rock slope under blasting vibration are analyzed and compared with the field monitoring results.The results show that the vertical vibration velocity of the measured points of the high slope is larger than that of the horizontal direction,and the magnification effect of blasting vibration appears when the height difference reaches a certain level;the vertical and horizontal deformation of the slope occurs in a small part,but the horizontal displacement of the bottom of the slope varies greatly and concentrates,which reduces the stability of the slope and reduces the model.The simulation results can provide guidance for accurate evaluation of rock slope safety and optimization of blasting parameters.
作者
张耿城
郭连军
贾建军
梁尔祝
董英健
ZHANG Gengcheng;GUO Lianjun;JIA Jianjun;LIANG Erzhu;DONG Yingjian(School of Mining Engineering,University of Science and Technology Liaoning,Anshan 114051,China;Shenyang University of Technology,Shenyang 110870,China;Ansteel Mining Blasting Co.,Ltd.,Anshan 100083,China)
出处
《中国矿业》
北大核心
2020年第12期165-169,共5页
China Mining Magazine
基金
“十三五”国家重点研发计划“多层大空区安全处理与生产协同技术”资助(编号:2016YFC0801603)
辽宁省自然科学基金“爆破作用下岩体损伤裂纹扩展机理及破碎形态控制研究”资助(编号:20170540456)。
关键词
露天铁矿
岩石边坡
爆破振动
响应特征
信号分析
open-pit mine
rock slope
blasting vibration
response characteristic
signal analysis
