摘要
为了有效降低煤矿井下爆破作业扰动,减少爆破诱发的矿震和煤与瓦斯突出等次生灾害,需要对煤矿井下爆破作业能量变化规律进行研究。采用锚杆外挂式方法安装传感器,优化了微震监测系统安装方法。对煤矿井下爆破作业过程的微震信号进行采集,并应用小波包分解方法分析其频谱,发现煤矿井下爆破作业信号的能量频带分布范围广,各个频带内爆破微震信号的能量百分比不断变化。爆破微震信号92%以上的能量集中在0～500 Hz的低频带范围内。随传播距离的增加,微震信号的高频部分衰减速度快。在煤矿现场应用低爆速、低密度、小直径的炸药,降低最大一段的炸药药量,采用分散布药与不耦合装药方式有利于降低地震效应。
In order to reduce the disturbance caused by coal mine underground blasting,reduce the secondary disasters such as mine earthquake and coal and gas outburst,need to study the energy variation law of coal mine blasting operation. Install the sensor using bolt plug-in method,installation method to optimize the microseismic monitoring system. Coal mine blasting process of microseismic signal acquisition and application of wavelet packet decomposition method for the analysis of the spectrum,it is found that the coal mine blasting signal frequency band energy distribution of a wide range of percentage of energy in each frequency band of blasting seismic signals constantly changing. More than 92% of the energy concentration of blasting seismic signals in the 0 ~ 500 Hz frequency band.With the increase of propagation distance,the high frequency part of microseismic signal attenuation speed. In the coal mine field,the low detonation velocity,the low density,the small diameter of the explosive,and the lower the maximum amount of explosive charge,and the distribution of the drug and the non coupling charging method are used to reduce the seismic effect.
出处
《爆破》
CSCD
北大核心
2016年第2期78-82,共5页
Blasting
基金
国家"十二五"科技支撑计划项目(2012BAK04B07)
贵州省社会发展攻关计划项目(黔科合社G字[2011]4003
黔科合SY字[2010]3036)
关键词
煤层
爆破
微震
频谱分析
coal seam
blasting
microseismic
spectrum analysis
