摘要
为探索岩体结构面对爆破振动速度峰值、主频和信号中的能量分布等的影响,在钻沟石灰石露天矿爆破生产现场进行爆破振动测试。分别采用小波包分析和ANSYS/LS-DYNA数值模拟软件对结构面影响下的爆破振动信号和爆破振动传播规律进行分析研究。小波包分析结果表明,当地震波穿过结构面时,爆破振动频率介于0~15.6 Hz之间的能量占爆破地震波能量比例随之增加,增幅达63.1%,而振动频率介于15.7~31.3 Hz之间的能量比例随之降低,降幅达56.9%。数值模拟结果表明,爆破地震波在未穿过结构面之前和穿过结构面后,振速峰值没有明显的衰减;而穿过结构面时,振速峰值衰减明显,其平均减震率为40.66%。此外,地震波在坡体内受高程和结构面双重作用,导致其放大系数呈先增大后减小的趋势。
In order to investigate the rock structure planes influence on particle peak velocity,frequency characteristics and energy distribution of blasting vibration signals,the experiments of blasting vibration were carried out at Zuangou Limestone open-pit mine. The blasting vibration signals and propagation law under different elevation differences were analyzed with the methods of wavelet packet and numerical simulation respectively. The results of wavelet packet analysis show that the blasting vibration energy of vibration frequency from 0 Hz to 15. 6 Hz increases by63. 1%,while the proportion of blasting vibration energy of vibration frequency from 15. 7 Hz to 31. 3 Hz decreases by 56. 9% when the blasting seismic wave pass through the rock structure planes. The results of simulation show that the particle peak velocity wasn＇ t attenuated obviously when the blasting seismic wave doesn＇ t work with the rock structure planes,while the particle peak velocity attenuated obviously when the blasting seismic wave doesn＇ t work with the rock structure planes,and the average attenuation rate was 40. 66%. Further more,the blasting vibration amplification coefficient tended to increase firstly,and then decreased under the impact of elevation and rock structure planes.
出处
《爆破》
CSCD
北大核心
2016年第1期12-18,共7页
Blasting
基金
国家自然科学基金资助项目(51274157)
中央高校基本科研业务费专项资金资助(2014-zy-102)
中央高校基本科研业务费专项资金资助(2015IVA028)
关键词
爆破振动信号
结构面
小波包分析
能量分布
数值模拟
blasting vibration signal
rock structure planes
wavelet packet analysis
energy distribution
numerical simulation
作者简介
叶海旺（1971-），男，副教授、博士，从事采矿、爆破方面的研究与教学工作，（E-mail）yehaiwang369@hotmail．com。
通讯作者：雷涛（1983-），男，讲师、博士，从事采矿方面的研究与教学工作，（E-mail）leitao539@163．com。
