中兴矿沿空留巷工作面矿压显现规律研究

Study on Mine Pressure Behaviors of Gob-Side Entry Retaining Working Face in Zhongxing Mine

针对中兴矿沿空留巷工作面开展了矿压监测工作,通过分析液压支架工作阻力的变化和回采巷道的变形量,研究了工作面的矿压显现规律和二次采动巷道的变形规律。结果表明：工作面受二次采动影响巷道一侧的动载系数最大,达到了1.757,矿压显现最为明显;工作面两端周期来压持续时间较长,为中间位置持续时间的2.4～2.6倍,是周期来压影响的主要部位;工作面由于布置抽采巷而局部高度增加时,抽采巷附近区域周期来压现象不明显,会一直处于较高的顶板压力作用下,是工作面顶板管理的重点区域;回采巷道的两帮收敛量是顶板下沉量的2.28～3.38倍,帮部支护需要重点关注;沿空留巷采动影响剧烈区为工作面前方10m以内,采动影响区为工作面前方10～50m,该区域内工作面的矿压显现对巷道围岩变形起到一定的预示作用。

Mine pressure monitoring was carried out in gob - side entry retaining working face of Zhongxing Mine. Mine pressure behaviors of working face and the law of secondary mining - induced roadway deformation were studied by analyzing working resistance of hydraulic supports and deformation of roadway. The results show that, the maximum dynamic load coefficient of working face, which reaches 1. 757, occurs in the area close to the roadway affected by secondary mining; the two ends of roadway is the major affected area of periodic weighting, in which the periodic weighting duration is 2.4 ～ 2. 6 times of that in the middle. When height of partial working face increases due to the drainage roadway, periodic weighting becomes unobvious, which is the key region of roof management as it＇s always under high roof pressure. The side wall convergence is 2. 28 ～ 3.38 times of the roof subsidence, so more attention should be paid to side wall support. In the roadway, when distance between working face and monitoring section is less than 10m, mining pressure affects strongly, when the distance is between 10m to 50m, mining pressure begins to influence, mining pressure can be predictive for the roadway deformation in this area.