基于电磁辐射监测特厚煤层综放开采过程中煤岩动力灾害预测

Dynamic tendency prediction of fully mechanized top coal caving mining in ultra thick seam by EMR monitoring

目前缺乏针对特厚煤层工作面开采的电磁辐射特征研究。本文利用电磁辐射技术对彬县水帘洞煤矿特厚煤层综掘面和综放面动力灾害倾向进行了监测,得到特厚煤层电磁辐射强度和脉冲数特征。监测结果表明:(1)掘进工作面正常掘进时,强度和脉冲数都较小,强度在15mv以下,脉冲数基本为0;掘进至背斜构造时,强度增大、波动性较大,有弱动力灾害倾向;(2)综放面强度和脉冲数均较大,正常回采时强度在100mv以下,脉冲数在(6-10)×104范围内波动;周期来压时强度最大、脉冲数最小,强度最大到190mv,脉冲数最小值仅418次,有弱动力灾害倾向,现场采取的顶煤预裂有助于消除煤岩动力灾害发生可能性。电磁辐射变化特征对预测特厚煤层采掘过程中煤岩动力灾害倾向有参考价值。

Electromagnetic radiation characteristic in fully mechanized top coal caving mining in ultra thick seam were obtained with electromagnetic radiation technique in Binxian Shuiliandong Colliery. The results showed that, （ 1 ） The intensity and pulse number are small when the heading face was normal boring, the strength was followed 15mv, and the pulse number was basiced 0;there was weak dynamic tendencies when tunneling to the anticline because of the intensity and volatility are both bigger; （2） Intensity and pulse number are both strong in fully mechanized caving face ,when the normal mining,the intensity was followed 100mv,and the pulse number was waved between （6 - 10）×10^4 ;The intensity was the biggest and the pulse number was the least when periodic mine ground pressure coming,the intensity was up to 190mv,and the pulse number was minimum only 418. Weak dynamic tendencies were predicted. The result may be of value to forecast dynamic tendencies.