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煤层回采工作面会在工作面前方一定范围内形成应力集中区,而在应力集中区进行采掘活动时,会导致集中应力的叠加,容易诱发煤与瓦斯突出事故。以某矿煤巷掘进工作面通过上覆煤层工作面停采线应力集中区为实例,对区域和局部防突措施效果进行了分析,结果表明,在工作面停采线应力集中的影响范围可达周围40 m,尤其是在工作面前方,瓦斯排放钻孔对缓解应力集中影响有明显效果。
Coal mining face will form a stress concentration area within a certain range in front of the working face, while mining activities in the stress concentration zone will lead to the superimposition of concentrated stress, which will easily induce coal and gas outburst accidents. The effect of regional and local outburst prevention measures was analyzed based on the stress concentration area of the overburden line in overlying coal seam working face of a coal mine tunneling face. The results show that the influence range of stress concentration at the stop face of mining face may be Up to 40 m around, especially in front of the working face, gas drainage holes have obvious effect on relieving stress concentration.