娘姆特煤矿首采区综放工作面矿压规律研究
发布时间：2018-11-16 07:17
【摘要】：娘姆特煤矿首采区煤层属于大倾角煤层,目前尚未开采,矿区地表赋存有20m-70m厚的多年冻土层,多年冻土层下大倾角煤层开采工作面矿压问题目前尚无人研究,冻土的特殊性决定了工作面矿压规律的特殊性。多年冻土层对矿井矿压规律的影响主要表现在其破断使工作面面临冲击矿压现象,从而对井下生产人员的人身安全造成严重威胁。因此,对娘姆特煤矿首采综放工作面矿压规律的研究极为迫切。文章主要通过研究多年冻土层物理力学性质与温度的关系,结合实验手段分析研究娘姆特首采工作面覆岩运移规律和应力分布规律。研究表明,工作面上覆冻土层温度分布受埋深影响,地表季融层温度变化受季节温度影响较大,随深度加深,夏季与冬季冻土层温度分布规律趋于一致,冬季冻土层温度梯度约为0.1℃/m,夏季冻土层温度梯度约为0.16℃/m,多年冻土层的物理力学性质随温度改变也相应改变,与温度近似成线性关系。通过理论计算分析,得出首采面上覆多年冻土层破断步距与温度之间的函数关系式,并指出多年冻土层破断时对下方覆岩造成能量冲击,产生的弯曲能量指数大小与多年冻土层温度有关。通过建立数值模型,模拟研究得出首采工作面开采后围岩的位移分布呈带状不对称分布,工作面的推进会造成围岩的变形破坏,多年冻土层下部产生明显离层现象,离层高度受冻土层温度影响,夏季达到1.6m,冬季达到1.38m;多年冻土层的下沉量随着开采范围增加线性增加。开采范围越大,地表多年冻土层受采动影响越剧烈,随着工作面的推进,老顶初次来压步距为22.49m,周期来压步距为14.4m,冻土层将持续下沉,离层范围会逐渐扩大,当开采范围达到一定程度后多年冻土层会发生破断并且整体下沉,易引起工作面顶板控制问题突出。研究结果对娘姆特煤矿的实际生产具有指导意义。
[Abstract]:The coal seam in the first mining area of Niangmute coal mine belongs to the large dip coal seam, which has not been mined at present. There is 20m-70m thick permafrost on the surface of the mining area, and no one has studied the problem of mining face pressure in the coal seam mining face under the permafrost. The particularity of permafrost determines the particularity of mining pressure law. The influence of permafrost on mine rock pressure is mainly reflected in the fact that the break of permafrost makes the working face the phenomenon of rock pressure impact, thus posing a serious threat to the personal safety of the underground production personnel. Therefore, it is urgent to study the law of mine pressure in the first fully mechanized caving face of Niangmte Coal Mine. In this paper, the relationship between physical and mechanical properties of permafrost and temperature is studied, and the law of overlying rock migration and stress distribution in the first mining face of Niangm is analyzed by means of experiments. The results show that the temperature distribution of permafrost is affected by burial depth, and the temperature of thawing layer is influenced by seasonal temperature, and the temperature distribution of frozen soil tends to be consistent with the depth of permafrost in summer and winter. The temperature gradient of permafrost is about 0.1 鈩，
本文编号：2334836
[Abstract]:The coal seam in the first mining area of Niangmute coal mine belongs to the large dip coal seam, which has not been mined at present. There is 20m-70m thick permafrost on the surface of the mining area, and no one has studied the problem of mining face pressure in the coal seam mining face under the permafrost. The particularity of permafrost determines the particularity of mining pressure law. The influence of permafrost on mine rock pressure is mainly reflected in the fact that the break of permafrost makes the working face the phenomenon of rock pressure impact, thus posing a serious threat to the personal safety of the underground production personnel. Therefore, it is urgent to study the law of mine pressure in the first fully mechanized caving face of Niangmte Coal Mine. In this paper, the relationship between physical and mechanical properties of permafrost and temperature is studied, and the law of overlying rock migration and stress distribution in the first mining face of Niangm is analyzed by means of experiments. The results show that the temperature distribution of permafrost is affected by burial depth, and the temperature of thawing layer is influenced by seasonal temperature, and the temperature distribution of frozen soil tends to be consistent with the depth of permafrost in summer and winter. The temperature gradient of permafrost is about 0.1 鈩，
本文编号：2334836
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