基于SOS微震监测系统的综放工作面来压周期分析.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2012／20(6)-0986-06基于SOS微震监测系统的综放工作面来压周期分析术谢鹏飞明月(山西冀中能源集团金晖荣泰矿吕梁033000)摘要针对综放回采工作面老顶来压时易发生冒顶冲击地压事故，某矿1305综放工作面采用波兰矿山研究总院研制的新一代SOS高精度微震监测系统，对工作面自开切眼回采开始进行全程时时连续监测。统计分析微地震事件、事件发生频率及事件总能量的周期性变化，从而推断出老顶断裂的周期性。再经过理论计算验证系统的准确性。结果表明：工作面的周期来压与矿震事件能量的周期变化存在相对应的关系；强烈微

2、震活动发生前有一段弱震活动时期，为强震的发生积蓄了更多的能量；周期来压时释放的总能量在某一特定水平波动，但波动的变化不稳定性增强。该结论对工作面安全回采及预防矿震冲击地压的发生具有一定的现实指导意义。关键词微地震综放开采周期来压来压步距微震监测系统中图分类号：TD324文献标识码：AFULLY．MECHANIZEDCoALFACEPERIoDICWEIGHTINGANALYSISBASEDoNSoSMICRo．SEISMICMoNIToRINGSYSTEMXIEPengfeiMINGYue(JinhuiRongtaiMineofShanxiJizhongEnergyGroup，Lvliang0

3、33000)AbstractThispaperaimstoeffectivelypreventrockburstaccidentsOccursbecauseoftheroofcavingwiththeoldroofperiodicweightinginfully-mechanizedsublevelcavingminingface．Itusestheminingexamplesoffully。mecha—nizedsublevelcavingminingin1305workingfaceofDongtanmineandadoptsanewgenerationSOSmicroseismmonit

4、oringandmeasuringsystem．ThesystemwasmadeinPolandMiningResearchInstitute．Itwasdevelopedtofulltimemonitoringandmeasuringontheworkingfacesincethebeginningofworkingfaceinterconnection．Thepa‘peranalyzesstatisticallythemicroearthquakeevents，incidentfrequencyandeventtotalenergyperiodicchanges．Thusitdeduces

5、theoldrooffractureperiodicity．Afterwards，itprovestheaccuracyofthesystemthroughtheoreticalcalculations．Theresultsshowthatthereisacorrespondingrelationshipbetweentheworkingfaceperiodicweightingandeventtotalenergyperiodicchanging．Beforethestrofigmicro—seismicactivityoccured，therewouldbeaweakseismicacti

6、vityperiodandtheweakseismicactivitywouldplayenergyaccumulationroletothestrongseismicOC—curred．Releasingofthetotalenergyinperiodicweightingfluctuatesinacertainrangefluctuations，buttheinstabili-tvoffluctuationchangesenhanced．Theconclusionhascertainactualsignificancefortheworkingfacesafetyminingandprev

7、entingtheoccurrenceofmining—inducedearthquakes．KeywordsMicro—seismicactivity，Fully-mechanizedsublevelcavingmining，Periodicweighting，Weightingstepdistance，Micro．seismmonitoringandmeasuringsystem收稿日期：20