摘要
声发射传感器安装是确保有效监测声发射信号的重要环节。通过不同安装方式的对比分析,指出煤矿井下进行煤岩动力灾害声发射监测时应优先选择传感器孔底安装方式。设计了一种快速便捷的声发射传感器孔底安装叉式固定方法,并进行了现场考察。结果表明,该方法简化了安装工艺,解决了上向孔内传感器和煤岩体注浆耦合不紧密导致监测信号残缺的问题,提高了传感器与煤岩体耦合的时效性、稳定性,确保了声发射信号的持续有效接收。根据现场安装钻孔角度,形成了声发射传感器孔底安装水泥注浆固定法和叉式固定法2种安装方法。在大角度上向孔和水平孔内安装时,宜选择声发射传感器孔底安装叉式固定法;在下向孔内安装时,宜采用孔底安装水泥注浆固定法。
The installation of acoustic emission sensor is an important step to ensure the effective monitoring of acoustic emission signals.Based on the comparison and analysis of different installation methods,it was pointed out that the hole bottom installation of sensor should be selected preferentially when the acoustic emission was used to monitor coal and rock dynamic disasters in coal mine.A fast and convenient hole bottom installation method of acoustic emission sensor named claw fixation method was designed and the field test was carried out.The test results show that this method can simplify the installation process,and solve the problem that the coupling of the sensor and the coal and rock by cement grouting in the upward hole is not close,which leads to the incomplete monitoring signals,and improve the timeliness and stability of the coupling between the sensors and the coal and rock,and ensure the signals can be received continuously and effectively.According to the angle of the field installation drill holes,the two kinds of the hole bottom installation methods of acoustic emission sensors have been formed,namely the installation method by cement grouting and the claw fixation.When the sensors are installed in large angle upward holes or horizontal holes,it is advisable to choose the claw fixation method;when the sensors are installed in downward holes,the installation method by cement grouting should be used.
作者
李建功
LI Jiangong(CCTEG Chongqing Research Institute,Chongqing 400037,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;School of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China)
出处
《矿业安全与环保》
北大核心
2020年第4期93-96,102,共5页
Mining Safety & Environmental Protection
基金
国家重点研发计划项目(2018YFC0808001)
“十三五”国家科技重大专项(2016ZX05045004)。
关键词
煤岩体
声发射
传感器
安装方式
孔底安装
叉式固定
coal and rock
acoustic emission
sensor
installation mode
hole bottom installation
claw fixation
作者简介
李建功(1983-),男,山东青岛人,硕士,副研究员,主要从事煤岩瓦斯动力灾害预测与防治方面的研究工作。E-mail:flyljg@163.com。
