掘进工作面瓦斯异常涌出的微震前兆特征分析与验证

Analysis ofmicroseismic characteristics and regularity of abnormal gas emission in entry driving

为了探索煤与瓦斯突出的微震监测可行性,在贵州某矿11112掘进工作面开展了巷道掘进过程中瓦斯异常涌出的微震响应规律研究,寻求了微震、声发射、电磁辐射三者与敏感指标瓦斯浓度之间的内在关联特征。通过分析煤与瓦斯突出的微震监测预警机制,结合该掘进工作面的实测数据进行统计分析,得到如下结论:(1)微震技术内因(瓦斯压力)、外因(地应力等)的联合监测机制是瓦斯突出预警的前提和基础;(2)瓦斯异常涌出是煤与瓦斯突出的直接征兆,瓦斯涌出变化伴随有较明显的微震响应;(3)微震的震动频次、能量(震级)、分布规律等指标与瓦斯异常涌出之间存在关联规律;(4)以掘进工作面瓦斯涌出异常为参照,对比验证了震、声、电参量与瓦斯数据的内在联系。本文研究初步探索了基于微震监测的煤与瓦斯突出前兆特征挖掘及预警方法,对煤与瓦斯突出灾害的监测预警具有一定参考意义。

In order to explore the feasibility of microseismic monitoring of coal and gas outburst, the responselaw of microseismic, acoustic emission and electromagnetic radiation was studied at the driving entry of a coalmine in Guizhou province. Based on the analysis of the feasibility of microseismic warning of coal and gas outburst and the statistical analysis of the measured data of entry driving, the following conclusions are obtained：（1） the joint monitoring mechanism of internal cause （ gas pressure） and external cause （ surrounding rockstress） of microseismic technology is the premise and foundation of coal and gas outburst warning; （2） abnormal gas emission is a direct sign of coal and gas outburst, and the change of gas emission is accompanied byobvious microseismic response; （3） there is a correlation law between the microseismic indexes （vibration frequency, energy （magnitude） and distribution） and the abnormal emission of gas; （4） the internal relations between the seismic, acoustic and electric parameters and the gas data are verified by comparison with the abnormal gas emission （over-limit, etc.） on the entry driving. In this paper, feature mining and warning methods of coal and gas outburst based on microseismic monitoring are preliminarily explored, which is of certainreference significance for monitoring and warning of coal and gas outburst disasters.