摘要
通过对海孜煤矿762工作面上覆厚度较薄、变化大、整体性较差的火成岩的微震监测,分析了此特殊条件火成岩变形破断的微震活动规律。结果表明,火成岩下微震活动以低能量震动为主,0～200 J的占83.1%,不会对工作面的回采构成顶板动力威胁;火成岩的破断形式为分层破断,并非整体劈裂破断;火成岩破断微震信号的频谱特性为振幅小、持续时间短、衰减快;主要频带范围为0～200 Hz,主频在50 Hz和150 Hz左右,呈现"双峰值"现象。此规律的获得,可以为类似条件火成岩破断的监测与预警提供有效的途径。
Based on microseismic monitoring of special igneous rock at 762 working face of Haizi Coal Mine, the article analyzed microseismic activity law of deforming and breaking of special igneous rock. The results show that microseismic activity under igneous rock is mainly with low power shock, 0 to 200 J accounted for 83.1% , which will not cause the roof impetus threat during mining; breaking pattern of igneous rock is layered, not holistic; the spectrum feature of igneous rock＇s ruptured microseismic signals are lower amplitude, shorter duration time, faster attenuation; main frequency is about 0 to 200 Hz, the main frequency presents “double peak” phenomenon around 50 Hz and 150 Hz. With above rules, failure and deformation of similarity conditions igneous rock can be monitored and predicted effectively.
出处
《煤矿安全》
CAS
北大核心
2014年第7期183-186,共4页
Safety in Coal Mines
基金
教育部新世纪优秀人才支持计划资助项目(NCET-10-0769)
全国优秀博士论文作者专项基金资助项目(2010044)
江苏省"333工程"资助项目(BRA2011183)
江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)
关键词
火成岩
微震监测
变形破断
微震活动规律
频谱特性
igneous rock
microseismic monitoring
deforming and breaking
microseismic activity law
spectrum feature
