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요약정보
群孔齐发爆破岩体振动频谱特性研究 / Vibration Spectrum Characteristics of Rock Mass in Simultaneous Borehole Blasting
Resource Type
Academic Journal
Authors
李新平
;
张雪屏
;
刘飞香
;
郑博闻
;
罗忆
;
LI Xin-ping
;
ZHANG Xue-ping
;
LIU Fei-xiang
;
ZHENG Bo-wen
;
LUO Yi
Source
爆破 / Blasting
. 38(1):14-35
Subject
爆破振动
群孔
频谱曲线
主频
衰减规律
Language
Chinese
ISSN
1001-487X
Online Access
Find it @ DONGA
초록
基于理论分析推导出群孔等效爆炸荷载的频域表达式,并代入黏性岩体爆破振动速度幅值谱表达式中,得到群孔齐发爆破激发的岩体振动速度幅值谱表达式.针对露天台阶深孔爆破,以正方形布置的四孔爆破作为研究对象,研究群孔齐发爆破岩体振动频率的影响因素及主频衰减机制.结果表明:群孔齐发起爆激发的振动速度幅值谱随爆心距、炮孔间距、单孔药量的增大,频谱结构由高频向低频偏移,其中随爆心距或炮孔间距的增大,爆破振动主频呈现出明显的衰减,且爆炸荷载的上升时间及下降时间直接影响爆破振动频谱的成分比例.对比三种典型岩石参数条件下的爆破振动主频衰减规律,发现主频与岩体弹性模量及纵波波速成正比,而主频衰减速度与岩体弹性模量及纵波波速成反比,其中锦屏大理岩中爆破激发的振动频率较小,且主频衰减速度最快.
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