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为深入研究深井高地应力条件下,面长变化对采场支承压力分布的影响规律,以淮南矿区某深部矿井为工程背景,基于FLAC~(3D)数值模拟软件和工程实践,分析了推进距离S与面长L之比分别为0.5、1.0、1.5 3种情况下的支承压力演化规律。结果表明:随着面长增加,支承压力峰值位于煤壁前方10 m处,应力集中系数达到2.7;沿工作面走向方向,当S与L之比为0.5时,支承压力峰值在面长超过360 m后呈现降低趋势;沿工作面倾向方向,S与L之比为1.0和1.5时,采场两端的支承压力峰值随面长增加呈现先增大、后减小的趋势。从采场矿压控制及灾害防治两方面综合考虑,优选工作面长度在200~240 m之间。
In order to deeply study the influence law of face length on pressure distribution of stope support in deep well and deep mine, taking a deep mine in Huainan mining area as engineering background, based on FLAC 3D numerical simulation software and engineering practice, the influence of propulsion distance S And face length L ratio were 0.5,1.0,1.5 3 cases of the evolution of the supporting pressure. The results show that with the increase of face length, the peak value of support pressure is 10 m in front of the coal wall and the stress concentration factor reaches 2.7. When the ratio of S to L is 0.5, m. The peak pressure of supporting pressure at both ends of the stope increases first and then decreases with the ratio of S and L being 1.0 and 1.5 along the working face orientation. Considered from two aspects of mine pressure control and disaster prevention and control of stope, the optimal working face length is between 200 and 240 m.