微震监测技术在煤矿突水监测中的应用

Application of monitoring techniques of micro-seismic to water inrush forecast in coal mines

为了解决每层地板破裂产生微震,而监测震源是确定突水部位这一关键问题,采用微震监测技术在峰峰矿区梧桐庄煤矿进行了底板突水预测试验研究,发现微震规律符合煤层底板"递进导升"的突水机理。根据监测结果,反求力学参数,模拟开采,就可以预测下一步可能破裂或微震的发生部位,进而实现突水的预测预报。该技术对煤矿安全高效生产有重要的意义和良好的应用前景。

Water inrush from coal seam floor normally occurs when limestone water with high pressure under the coal seam erupts out after the aquifer strata is damaged by mining activities. This means that micro-seismic activities will be taken place when the cracking at coal seam floor strata occurs. Therefore, monitoring the micro-seismic activities and positioning focal areas become an effective method to predict the possible inrush areas. The authors applied the technique in weekly seismic monitoring to forecast water inrush from coal seam floor in Wutongzhnang coal mine of Fengfeng coal field and found that these micro-seismic activities are complied with the inrush mechanism of ＂pressured water progressively intruding up into the floor aquifer＂. The monitoring results show that the fracturing or micro-seismic areas and water inrush can be forecasted by calculating mechanics parameters inversely and simulating mining activities. The technique is of significance to mine safety and efficient production in mining. There is no doubt that the technique has a great potential in industrial applications.