大倾角综采面覆岩活动规律研究

发布时间：2018-05-25 15:06

本文选题：大倾角煤层 + 覆岩活动　；参考：《中国矿业大学》2015年硕士论文

【摘要】：本论文以现有的大倾角煤层开采技术研究成果为指导,结合王洼二矿115011大倾角综采面开采地质条件,综合运用理论分析计算、物理模拟、数值模拟和现场实测等研究方法,针对大倾角综采面覆岩活动规律等内容进行了研究,取得了如下研究成果:(1)大倾角工作面开采后,覆岩整体垮落呈“7”型的拱结构。通过理论分析研究大倾角综采面顶板的破断演化过程,并建立破断顶板铰接结构力学模型,分析受力情况并提出其保持平衡条件。(2)大倾角工作面中顶板管理方面应该着重于上端部,底板控制方面的应该着重于下端部。大倾角工作面上部区域支承压力最小,中部较大,下部最大;超前支承压力集中系数中部最大,下部次之,上部最小。随着煤层倾角增大,大倾角工作面上方零应力区范围越来越小,且沿工作面倾向逐渐向工作面上部靠拢。(3)115011工作面初次来压步距为43.2 m。来压期间工作面支架工作阻力平均为5052 k N。周期来压步距平均为17.3 m,周期来压期间支架工作阻力平均为4149 k N。支架工作阻力沿倾向方向表现为中上部偏大,下部较小,建立大倾角综采面“支架-围岩”力学关系模型,计算得出自由状态下115011工作面支架倾向临界倾倒角度为23.2°,临界滑移角为7.4°。
[Abstract]:Under the guidance of the existing research results of large dip coal seam mining technology and combined with the mining geological conditions of 115011 fully mechanized coal face of Wangwa No. 2 Mine, this paper synthetically applies the research methods of theoretical analysis, physical simulation, numerical simulation and field measurement, etc. Based on the study of overlying rock activity law of fully mechanized mining face with large dip angle, the following research results are obtained: 1) after mining large dip face, the overburden collapse presents a "7" arch structure. Through theoretical analysis, the fracture evolution process of roof of fully mechanized face with large dip angle is studied, and the mechanical model of broken roof hinge structure is established. The stress situation is analyzed and the balance condition is put forward. (2) the management of the roof in the working face with large inclination angle should be focused on the upper end and the bottom plate control should focus on the lower end. The supporting pressure in the upper part of the working face with large dip angle is the smallest, the middle part is larger and the lower part is the largest. With the increase of coal seam inclination, the range of zero stress zone above the large dip face is smaller and smaller, and the initial pressure step distance is 43.2 mm. along the tendency to the upper part of the face. The working resistance of the support in the working face during the period of coming pressure is 5052 kN on average. The average step distance of periodic pressure is 17. 3 m, and the working resistance of the support during periodic pressure is 4149 kN on average. The working resistance of the support is larger in the middle and upper part and smaller in the lower part along the inclined direction. A mechanical model of "brace-surrounding rock" is established for the fully mechanized face with large dip angle. The results show that the critical collapse angle and slip angle are 23.2 掳and 7.4 掳respectively.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD325;TD823.21

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