科研之友
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摘要
Water jet cutting (WJC) can play a good role in coal pressure relief. Its effect is commonly evaluated using a traditional method based on debris-drilling amount. However, this evaluating result is unsatisfactory due to great artificial interference. Based on previous experimental researches on the relationship of electromagnetic radiation (EMR) to stress during the failure of coal rock under loading, we analyze the EMR response to seam pressure relief using WJC from the angle of stress relief and carried out experiments to verify that EMR response could be used to evaluate the effect of WJC on coalbed pressure relief at Xinzhi and Yuejin Coal Mines, China, with self-developed KBD5 EMR monitor. The research showed that after WJC, the intensity and changes of EMR reflect not only the stress level from which the cut coal seam suffered but also the processes of stress transfer and evolution, thus proving that EMR can be used to evaluate the effect of WJC for coal mass pressure relief. Moreover, the experiments also showed that if without borehole collapse after WJC, multiple WJC in the same borehole can be performed to monitor EMR signals and when two adjacent signal curves keep at the same level and without obvious decline, WJC could fully release pressure in coal mass.
- 出版日期2015-7
- 单位中国矿业大学（北京）
