枣泉煤矿变角度大倾角煤层综放开采覆岩运移规律研究
发布时间：2019-05-09 19:29
【摘要】：枣泉煤矿变角度大倾角煤层120210综放工作面受煤层倾角变化影响,导致工作面“支架-围岩”系统稳定性差,顶板管理困难,常规的放煤工艺难以实现工作面的安全高效生产。通过对变角度大倾角煤层综放工作面覆岩运移、应力分布及支架稳定性进行研究,提出了该类工作面开采围岩稳定性控制原则,对拓展大倾角煤层综放开采技术的应用空间具有重要的意义。本文采用物理相似模拟实验、数值分析、现场监测、理论分析相结合的研究方法,研究了变角度大倾角煤层综放工作面顶板运移、顶煤的破坏,分析了工作面矿压显现、支架稳定性分区域的原因,结果表明:变角度大倾角煤层综放工作面开采过程中,沿工作面倾向顶板运移具有分区域性的特征,工作面上部区域倾角小,直接顶垮落的矸石停留在原地,基本顶以“悬臂梁”结构的形式发生破断运动,顶板形成结构的层位基本相同,表现为缓倾斜煤层开采覆岩运移的特点;下部区域倾角大,顶板垮落的矸石沿底板滑移充填采空区,垮落形态向中部区域与下部过渡位置偏移,表现为大倾角煤层开采覆岩运移的特点;中部区域是上、下部区域角度的过渡段,覆岩的运移既有大倾角开采覆岩运移的特点又有倾斜煤层的特点,是两者转换的关键区域,特别是中部与下部过渡位置矸石对顶板的约束较弱,顶板破断后形成的结构层位较高是顶板活动的活跃区。工作面顶板运移的分区域性导致煤壁前方支承压力的分布不同,造成顶煤的破坏程度出现了差异,中部区域与下部、上部过渡位置支承压力分布范围及峰值较其它区域大,并在顶板运动的作用下顶煤过早的进入散体状态,导致支架的稳定性差;顶煤进入支架后方被放出,上部区域煤矸分界面呈对称的漏斗,中、下部区域煤矸分界面不再对称,轴线发生了向上的偏移。枣泉煤矿120210工作面矿压显现及支架稳定特征反应了覆岩运移的分区域性,根据工作面不同区域的特征,提出大倾角煤层变角度综放工作面开采围岩控制原则:上部区域是工作面实现安全高效生产的主体,下部区域支架的稳定性控制是工作面整体稳定性的基础,中部区域是实现工作面安全高效生产与系统稳定协调转换的关键。
[Abstract]:The 120210 fully mechanized caving face with variable angle and large dip angle in Zaoquan Coal Mine is affected by the change of coal seam dip angle, which leads to the poor stability of the "support-surrounding rock" system in the working face, the difficulty of roof management, and the difficulty of realizing the safe and efficient production of the working face by the conventional coal caving technology. Based on the study of overlying rock migration, stress distribution and support stability in fully mechanized top coal caving face with variable angle and large dip angle, the stability control principle of surrounding rock in this kind of working face is put forward. It is of great significance to expand the application space of fully mechanized caving mining technology in large dip coal seam. In this paper, by using the research methods of physical similarity simulation experiment, numerical analysis, field monitoring and theoretical analysis, the roof migration and top coal failure in fully mechanized top coal caving face with variable angle and large dip angle are studied, and the mine pressure appearance in working face is analyzed. The reasons for the stability of the support are as follows: in the mining process of fully mechanized top coal caving face with variable angle and large dip angle, the migration along the inclined roof of the working face has the characteristics of regionalization, and the dip angle of the upper part of the working face is small. The gangue falling directly from the roof stays in place, and the basic top breaks in the form of "cantilever beam" structure, and the horizon of the roof formation structure is basically the same, which shows the characteristics of overlying rock migration in gently inclined coal seam mining. The dip angle of the lower area is large, the gangue falling from the roof slips along the floor to fill the goaf, and the collapse pattern shifts to the middle area and the lower part, which shows the characteristics of overlying rock migration in the mining of high dip coal seam. The central region is the transition section of the angle between the upper and lower regions. The migration of overlying rock has the characteristics of both overlying rock migration and inclined coal seam with large dip angle, which is the key area of the conversion between the two. Especially, the gangue in the middle and lower transition position is weak to the roof, and the higher structural horizon formed after the roof fracture is the active area of roof movement. The zoning of roof migration in working face leads to the different distribution of supporting pressure in front of coal wall, resulting in differences in the damage degree of top coal. The distribution range and peak value of supporting pressure in the middle and lower parts and the upper transition position are larger than those in other areas. Under the action of roof movement, the top coal enters the bulk state prematurely, which leads to the poor stability of the support. When the top coal enters the rear of the support, the coal gangue interface in the upper area is symmetrical funnel, and the coal gangue interface in the middle and lower part is no longer symmetrical, and the axis shifts upward. The characteristics of rock pressure behavior and support stability in face 120210 of Zaoquan Coal Mine reflect the regionalization of overburden migration, and according to the characteristics of different areas of the face, The control principle of surrounding rock in fully mechanized caving face with variable angle in large inclination coal seam is put forward: the upper area is the main body of the safe and efficient production of the working face, and the stability control of the lower regional support is the foundation of the overall stability of the working face. The central area is the key to realize the safe and efficient production of the working face and the stable and coordinated transformation of the system.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD325
[Abstract]:The 120210 fully mechanized caving face with variable angle and large dip angle in Zaoquan Coal Mine is affected by the change of coal seam dip angle, which leads to the poor stability of the "support-surrounding rock" system in the working face, the difficulty of roof management, and the difficulty of realizing the safe and efficient production of the working face by the conventional coal caving technology. Based on the study of overlying rock migration, stress distribution and support stability in fully mechanized top coal caving face with variable angle and large dip angle, the stability control principle of surrounding rock in this kind of working face is put forward. It is of great significance to expand the application space of fully mechanized caving mining technology in large dip coal seam. In this paper, by using the research methods of physical similarity simulation experiment, numerical analysis, field monitoring and theoretical analysis, the roof migration and top coal failure in fully mechanized top coal caving face with variable angle and large dip angle are studied, and the mine pressure appearance in working face is analyzed. The reasons for the stability of the support are as follows: in the mining process of fully mechanized top coal caving face with variable angle and large dip angle, the migration along the inclined roof of the working face has the characteristics of regionalization, and the dip angle of the upper part of the working face is small. The gangue falling directly from the roof stays in place, and the basic top breaks in the form of "cantilever beam" structure, and the horizon of the roof formation structure is basically the same, which shows the characteristics of overlying rock migration in gently inclined coal seam mining. The dip angle of the lower area is large, the gangue falling from the roof slips along the floor to fill the goaf, and the collapse pattern shifts to the middle area and the lower part, which shows the characteristics of overlying rock migration in the mining of high dip coal seam. The central region is the transition section of the angle between the upper and lower regions. The migration of overlying rock has the characteristics of both overlying rock migration and inclined coal seam with large dip angle, which is the key area of the conversion between the two. Especially, the gangue in the middle and lower transition position is weak to the roof, and the higher structural horizon formed after the roof fracture is the active area of roof movement. The zoning of roof migration in working face leads to the different distribution of supporting pressure in front of coal wall, resulting in differences in the damage degree of top coal. The distribution range and peak value of supporting pressure in the middle and lower parts and the upper transition position are larger than those in other areas. Under the action of roof movement, the top coal enters the bulk state prematurely, which leads to the poor stability of the support. When the top coal enters the rear of the support, the coal gangue interface in the upper area is symmetrical funnel, and the coal gangue interface in the middle and lower part is no longer symmetrical, and the axis shifts upward. The characteristics of rock pressure behavior and support stability in face 120210 of Zaoquan Coal Mine reflect the regionalization of overburden migration, and according to the characteristics of different areas of the face, The control principle of surrounding rock in fully mechanized caving face with variable angle in large inclination coal seam is put forward: the upper area is the main body of the safe and efficient production of the working face, and the stability control of the lower regional support is the foundation of the overall stability of the working face. The central area is the key to realize the safe and efficient production of the working face and the stable and coordinated transformation of the system.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD325
【参考文献】
相关期刊论文 前10条
1 王家臣;张锦旺;;综放开采顶煤放出规律的BBR研究[J];煤炭学报;2015年03期
2 伍永平;刘孔智;，
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