炮孔近区岩体振动主频及能量的数值模拟  

Numerical simulation of rock vibration dominant frequency and energy at blast hole near region

作　　者：罗忆[1] 郑博闻 刘飞香 李新平[1] 张雪屏 LUO Yi;ZHENG Bo-wen;LIU Fei-xiang;LI Xin-ping;ZHANG Xue-ping(Hubei Key Laboratory of Roadway Bridge and Structure Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;China Railway Construction Heavy Industry Corporation Limited,Changsha 410100,China)

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]武汉理工大学土木工程与建筑学院,武汉430070 [3]中国铁建重工集团股份有限公司,长沙410100

出　　处：《工程爆破》2020年第4期8-16,共9页Engineering Blasting

基　　金：国家自然科学基金资助项目(51779197)。

摘　　要：为了控制岩体爆破对保留岩体造成的破坏和损伤,针对炮孔近区爆破振动频率及能量变化问题,利用动力有限元数值模拟方法研究了单孔爆破10 m范围内爆心距、不耦合系数与爆破振动主频及能量的变化规律。结果发现爆破振动主频并不是随着爆心距的增大而单调递减,并且随着不耦合系数的增大同一爆心距位置处的振动主频先增大后减小再增大;爆破振动能量衰减向主频段靠拢并且随不耦合系数的增大变化浮动较小。In order to control the damage of retain rock mass caused by rock mass blasting,the problem of blasting vibration frequency and energy at blast hole near region was researched.Using dynamic finite element numerical simulation method,the variation law of blasting center distances,decouple ratio,vibration dominant frequency and energy within 10 m of single hole was studied.It is found that the dominant frequency of blasting vibration does not monotonically decrease with the increase of the blasting center distance.And as the decouple ratio increases,the dominant frequency of the vibration at the same blasting center distance increases first and then decreases,increases.The attenuation of blasting vibration energy is close to the dominant frequency and fluctuates less with the change of decouple ratio increasing.

关 键 词：炮孔近区 不耦合系数 爆心距 振动主频 振动能量 

分 类 号：TD235[矿业工程—矿井建设]