基于地音监测的工作面开切眼期间冲击危险性评价  

Rock burst risk assessment of working face during open-off cut based on acoustic emission monitoring

作　　者：邢麟楠 XING Linnan(China Coal Technology and Engineering Group Coal Mining Research Institute Co.,Ltd.,Beijing 100013,China;State Key Laboratory of Coal Resources Efficient Mining and Clean Utilization,Beijing 100013,China)

机构地区：[1]中煤科工开采研究院有限公司,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《煤矿安全》2021年第12期194-198,206,共6页Safety in Coal Mines

基　　金：天地科技股份有限公司科技创新创业资金专项资助项目(2019-TD-2-CXY006,2019-TD-2-CXY004)。

摘　　要：冲击危险性评价是开采冲击危险煤层时在掘进和回采阶段必须开展的工作,以确保掘进和回采工作面的安全;地音监测作为评价冲击危险性的方法之一,已广泛应用于冲击危险煤层的冲击危险性的监测与评价;采用地音监测系统对某矿二水平南一区21层一段工作面开切眼掘进过程进行实时监测,进而进行冲击危险性评价,提出了以地音异常指数作为划分冲击危险等级的评价方法。结合实际冲击显现情况,对地音数据分析发现,地音系统的单通道活动持续增长或持续沉寂、2个或以上通道活动突然增长,都预示着冲击危险的增加,并可作为冲击地压发生前的地音前兆信息;统计得出工作面切眼掘进期间地音报准率为66.6%,表明地音监测在冲击危险性评价方面具有较好效果。Impact risk assessment is a work that must be carried out in driving and stoping stage in mining coal seam with impact risk to ensure the safety of driving and stoping working face.As one of the methods to evaluate the impact risk,ground acoustic emission monitoring has been widely used in the monitoring and evaluation of the impact risk of coal seam.Ground acoustic emission monitoring system was used to monitor the driving process of opening hole in the first section of working face at the 21 st floor in the south area of the second level of a mine in real time,and then to evaluate the impact risk.A method was proposed to classify the impact risk by using ground acoustic emission anomaly index.Combined with the actual occurrence of rock burst,the analysis of ground acoustic emission data shows that the continuous increase or silence of single channel activity and the sudden increase of two or more channels activity indicate the increase of impact risk,and can be used as the ground acoustic emission precursor information before the occurrence of rock burst.According to the statistics,the accuracy rate of ground acoustic emission monitoring is 66.6%,which indicates that ground acoustic emission monitoring has a good effect on impact risk assessment.

关 键 词：工作面开切眼 地音监测 冲击危险性评价 异常指数 前兆信息 报准率 

分 类 号：TD324[矿业工程—矿井建设]