孤岛综采工作面覆岩运动特征及矿压显现研究

发布时间：2019-01-30 15:03

【摘要】：煤矿在进入开采末期,为了最大限度地回收资源,大量的煤柱急需开采,这些煤柱工作面大多已形成孤岛,因其开采受采空区周围支承压力影响,孤岛工作面覆岩运动规律和矿压显现规律与普通工作面开采条件下有很大差别。研究孤岛工作面开采的覆层运移规律和矿压显现规律是保证安全生产的关键所在。本文通过资料收集、理论分析、现场实测,建立力学模型,并结合数值模拟,对赵固一矿11031-1孤岛工作面的覆层运移特征和矿压显现规律进行了初步研究。论文介绍了孤岛工作面典型的“S”型采场覆岩空间结构,初步分析了该工作面覆岩空间结构的矿压分布特征及矿压显现规律,并对覆岩“三带”高度进行了分析。文中结合11031-1孤岛工作面建立数值模拟模型,对工作面的应力场和位移场变化进行详细分析,结合理论计算进行验证和对比,得到出该孤岛工作面来压步距及超前支撑压力分布。最后对11031-1工作面进行矿压观测,并对现场实测数据进行整理分析,结果与理论分析和数值模拟结果相吻合;而且支架阻力、围岩变形量等实测结果皆在安全生产的允许范围之内;工作面的回采过程中没有出现反常现象,能够满足该工作面的安全生产。
[Abstract]:At the end of coal mining, in order to recover resources to the maximum extent, a large number of coal pillars are in urgent need of mining. Most of these coal pillar faces have formed isolated islands because their mining is affected by the supporting pressure around the goaf. The law of overburden movement and rock pressure in Gudao face is different from that in common working face. It is the key to ensure safe production to study the law of overburden movement and the law of rock pressure behavior in the mining of isolated island face. In this paper, through data collection, theoretical analysis, field measurement, mechanical model and numerical simulation, the characteristics of overburden movement and the law of rock pressure appearance in 11031-1 isolated island face of Zhaogu No. 1 Mine are studied. This paper introduces the typical "S" type stope overburden space structure of Gudao face, and preliminarily analyzes the distribution characteristics of overlying rock spatial structure and the regularity of rock pressure appearance, and analyzes the height of the "three zones" of overburden rock. In this paper, the numerical simulation model of 11031-1 islanding face is established, the variation of stress field and displacement field is analyzed in detail, and the theoretical calculation is used to verify and compare it. The pressure-step distance and the pressure-ahead pressure distribution of the island face are obtained. Finally, the mine pressure of 11031-1 working face is observed, and the field measured data are analyzed. The results are in agreement with the theoretical analysis and the numerical simulation results. Moreover, the measured results of support resistance and surrounding rock deformation are within the allowable range of safety production, and there is no abnormal phenomenon in the mining process of the working face, which can satisfy the safety production of the working face.
【学位授予单位】：河南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323

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