坚硬顶板下近距离煤层同采错距及巷道布置研究

发布时间：2018-04-12 13:36

本文选题：近距离 + 坚硬顶板　；参考：《安徽理工大学》2015年硕士论文

【摘要】：针对山西集广煤矿9和10号煤层坚硬顶板下近距离同采所面临的工作面错距和下层煤回采巷道布置的技术问题,本文从现场调查分析工程情况的基础上,采用理论分析、计算机数值模拟以及现场矿压实测的研究方法,对近距离煤层开采底板应力分布和破坏范围、上覆岩层运动规律、倾向应力分布进行了研究。首先是分析了9号煤层开采后对底板的影响,理论计算并结合数值模拟得出了底板不同深度水平和垂直应力的变化趋势,为工作面合理错距的确定提供了依据合理。分析了上下煤层同采时下层煤工作面上覆岩层的运动规律,基于此确定下层工作面的具体合理位置。通过理论计算出开采对底板所形成的塑性破坏深度,煤层倾向支撑压力分布,为下层回采巷道的确定提供了依据。其次运用F1ac3D数值模拟软件建立模型,比较分析在不同的错距下,回采巷道的应力和变形情况。最终确定适合该地质条件下的巷道布置位置以及工作面的合理错距。最后对集广煤矿9和10号煤层同采过程中工作面矿压显现特征和回采巷道表面和深部位移进行现场实测研究,获取了丰富的矿压观测数据,结果表明,同采错距和巷道布置的实施效果较好,验证了理论分析以及数值模拟结果的合理性。通过上述研究,解决了坚硬顶板下近距离煤层同采工作面错距及巷道布置的难题,为今后相近地质条件下的煤层开采提供了一定理论参考依据和实践经验。
[Abstract]:In view of the technical problems of working face offset and roadway layout under hard roof of coal seam 9 and 10 in Jiguang Coal Mine, Shanxi Province, this paper adopts theoretical analysis on the basis of field investigation and analysis of engineering situation.In this paper, the distribution of stress distribution, failure range, overlying strata movement and tendency stress distribution of the floor of coal seam mining in close distance are studied by computer numerical simulation and field measurement of mine pressure.Firstly, the influence of coal seam No. 9 mining on the floor is analyzed, and the variation trend of horizontal and vertical stress in different depth of floor is obtained by theoretical calculation and numerical simulation, which provides a reasonable basis for determining the reasonable offset of working face.This paper analyzes the movement law of the overlying strata of the lower coal face during the same mining of the upper and lower coal seams, and determines the concrete and reasonable position of the lower coal face based on the above analysis.The plastic failure depth formed by mining on the floor and the pressure distribution of inclined support in coal seam are calculated theoretically, which provides the basis for the determination of the lower mining roadway.Secondly, the F1ac3D numerical simulation software is used to establish the model and to compare and analyze the stress and deformation of mining roadway under different offset.Finally, the location of roadway layout and the reasonable offset of working face are determined.In the end, the characteristics of mine pressure in coal seam 9 and 10 in Jiguang Coal Mine and the surface and deep displacement of mining roadway are studied in situ, and abundant observation data of mine pressure are obtained. The results show that,The effect of the same mining fault distance and roadway layout is good, which verifies the rationality of the theoretical analysis and numerical simulation results.Through the above research, the problems of misalignment and roadway arrangement in close distance coal seam under hard roof are solved, which provides a certain theoretical reference and practical experience for coal seam mining under similar geological conditions in the future.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.81

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