深部开采薄煤层坚硬顶板控制技术应用与研究

发布时间：2018-06-01 04:47

本文选题：薄煤层 + 坚硬顶板　；参考：《河北工程大学》2017年硕士论文

【摘要】：峰峰集团九龙矿15445工作面是薄煤层坚硬顶板工作面,其所面临的顶板管理困难,煤炭开采比较复杂的问题是我国目前煤炭行业研究的重点。因此,对于其矿压规律的研究,希望为后期类似条件的煤矿进行安全开采提供参考。九龙矿2#煤厚约5.9米,赋存条件较好,是该矿的主采煤层。鉴于其瓦斯含量严重超标,该矿计划将其下覆煤层4#煤作为保护层率先开采,以期能够安全采出上覆大煤。在利用理论分析法、相似材料模拟法、数值模拟法等研究手段的基础上,对大采深工作面坚硬顶板的控制技术理论进行研究,构建出与薄煤层坚硬顶板相适合的防护控顶理论体系和方法。第一,通过理论分析法,对15445工作面作为保护层进行可行性验证,同时对工作面上覆岩层的矿压规律进行理论研究。第二,通过相似材料模拟法,对15445工作面顶板的矿压及运动规律进行研究,实验得出其上覆岩层沉降变形特征以及岩层破断特征。第三,通过FLAC3D软件建立15445工作面数值模型,研究其开采工程中上覆岩层的应力分布和集中情况,实为研究工作面回采过程中上部岩层受采动影响的变化,并分析之应力集中区域和数值大小的变化规律,为后期顶板管理提供参考。第四,针对15445工作面顶板坚硬难垮落的特点,对其顶板实施预裂爆破释放顶板压力,以达到顶板碎化、弱化的效果,使开采安全性提高,后期开采大煤时,瓦斯释放效果更加显著。
[Abstract]:15445 face of Jiulong Coal Mine of Fengfeng Group is a hard roof working face in thin coal seam. It is difficult to manage the roof and the mining of coal is more complicated, which is the focus of the coal industry research in our country at present. Therefore, for the study of mine pressure law, it is hoped to provide a reference for the safe mining of coal mines with similar conditions in the later stage. Jiulong Coal Mine is the main coal seam of Jiulong Mine because of its coal thickness of 5.9 meters. In view of the serious excess of gas content in the mine, it is planned to take the coal seam under the coal seam as a protective layer to take the lead in mining it, in order to safely mine the overlying coal. On the basis of theoretical analysis method, similar material simulation method, numerical simulation method and so on, the theory of hard roof control technology in large mining face is studied. The theory system and method of roof control for protection and hard roof of thin coal seam are constructed. Firstly, through theoretical analysis, the feasibility of 15445 working face as protective layer is verified, and the rock pressure law of overlying strata is studied theoretically at the same time. Secondly, through the similar material simulation method, the rock pressure and movement law of the roof of 15445 working face are studied, and the settlement and deformation characteristics and fracture characteristics of the overlying strata are obtained by experiments. Thirdly, the numerical model of 15445 face is established by FLAC3D software to study the stress distribution and concentration of the overlying strata in the mining engineering, which is to study the change of the upper strata affected by the mining movement in the mining process of the working face. The variation law of stress concentration area and numerical value is analyzed to provide reference for later roof management. Fourthly, in view of the characteristics of hard and hard roof collapse in 15445 working face, the roof pressure is released by pre-splitting blasting to achieve the effect of roof fragmentation and weakening, so as to improve the safety of mining and to mine large coal in the later stage. The effect of gas release is more remarkable.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD327.2

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