薄基岩工作面顶板稳定性分析及矿压显现特征研究

发布时间：2018-10-11 12:10

【摘要】：在我国的内蒙古、两淮以及河南等地的拥有较大储量的厚表土、薄基岩煤层。近年来,在薄基岩煤层的过程中,发生多起综采面压架致灾事故,造成了重大的经济损失和人员伤亡,严重威胁煤矿安全高效生产。本文针对1611(3)工作面的具体工程地质条件,采用理论分析、数值模拟和现场观测的方法对薄基岩煤层的顶板稳定性及矿压特征进行了深入的分析研究,同时对在该条件下采场液压支架的适应性以及如果对破碎顶板进行控制有效控制进行了分析研究。通过研究得出以下结论： (1)通过对薄基岩煤层顶板矿压特征的数值模拟分析得出,煤层开采导致工作面两端的煤岩体内形成了应力集中区域,工作面采空区上方的岩体内形成了应力降低区域；工作面上覆岩层的垂直应力随与工作面距离的增加而逐渐减小,并且随着工作面长度的增加,其减小趋势逐渐变缓。 (2)通过现场实测,总结出了1611(3)工作面的来压特征；并根据工作面回采期间,液压支架的工作阻力、采高变化以及巷道围岩变形情况,分析得出了ZY10800/30/65型液压支架不能满足工作面安全高效开采的需要,并对来压期间液压支架出现破损的原因进行了分析。 (3)对1611(3)工作面在回采过程中出现的四次漏顶进行了分析,得出造成工作面漏顶的原因,并针对工作面的具体情况提出了顶板破碎防治的措施,保证了工作面的安全回采。研究成果可为薄基岩工作面安全回采、防治压架突水灾害提供理论依据及参考。
[Abstract]:In Inner Mongolia, Lianghuai and Henan provinces, there are thick topsoil and thin bedrock coal seams. In recent years, in the process of thin bedrock coal seam, a number of fully mechanized face pressure accidents occurred, which caused great economic losses and casualties, and seriously threatened the safety and efficient production of coal mines. Aiming at the concrete engineering geological conditions of 1611 (3) coal face, this paper makes a deep analysis and study on the roof stability and rock pressure characteristics of thin bedrock coal seam by means of theoretical analysis, numerical simulation and field observation. At the same time, the adaptability of stope hydraulic support and the effective control of broken roof are analyzed and studied. The conclusions are as follows: (1) through the numerical simulation and analysis of the roof pressure characteristics of thin bedrock coal seam, it is concluded that the coal seam mining results in the formation of stress concentration area in the coal and rock mass at both ends of the coal face. The stress reduction area is formed in the rock above the goaf of the face, the vertical stress of the overlying strata decreases gradually with the increase of the distance from the face to the face, and with the increase of the length of the working face, the vertical stress decreases gradually with the increase of the length of the working face. (2) the pressure characteristics of 1611 (3) working face are summed up through the field measurement, and according to the working resistance, mining height change and surrounding rock deformation of roadway during the mining period of the working face, the working resistance of the hydraulic support, the change of mining height and the deformation of the surrounding rock of the roadway are analyzed. It is concluded that ZY10800/30/65 hydraulic support can not meet the needs of safe and efficient mining. The causes of the breakage of the hydraulic support during the period of pressure coming are analyzed. (3) the four leakage roof in the mining process of 1611 (3) face is analyzed, and the cause of the leakage of the working face is obtained. According to the concrete situation of the working face, the measures of preventing and curing roof breakage are put forward to ensure the safe mining of the working face. The research results can provide theoretical basis and reference for safe mining of thin bedrock face and prevention of water inrush disaster of pressure frame.
【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】：TD323

【参考文献】