厚煤层大采高开采坚硬顶板的活动规律及控制技术研究
发布时间：2018-12-29 12:12
【摘要】：基于厚煤层大采高开采条件下出现的支架压架、煤壁片帮等问题,针对上述情况,本文以大同矿区晋华宫煤矿402盘区的大采高综采工作面为研究背景,分别采用理论分析、数值模拟和现场实测等方法,对厚煤层大采高开采条件下顶板的活动规律及应力场分布特征进行了分析。(1)以晋华宫煤矿8210工作面地质为条件,运用数值模拟分别对厚煤层大采高开采条件下的顶板活动规律以及应力场分布特征进行了研究。不同采高对上覆岩层的破断方式有影响,采高越大顶板关键层越容易发生滑落失稳,上覆岩层下沉量越大。顶板关键层破断方式的不同,对采场应力场的分布特征有影响,当关键层以砌体梁结构破断时,煤壁超前支承压力峰值大于滑落失稳时的煤壁超前支承压力,峰值距煤壁距离小于滑落失稳时峰值距煤壁的距离,采高越大,初次来压时,关键层形成的应力拱高度越高。(2)以关键块体破断角α为变量,构建了大采高工作面支架与围岩关系力学模型。对关键块体滑落失稳条件进行了分析,其它条件一定时,当α越小,关键块体发生滑落失稳的可能性越大,依据理论计算公式得到支架所需的支护阻力不小于12.65MN/架。并采用数值模拟的方法对煤壁片帮进行了研究,得到采高越大煤壁片帮的范围越大。阐述了煤壁片帮机理,给出了煤壁片帮的防治措施:①提高支架性能、②改变塑性区煤体的物理力学性质、③通过外力破坏基本顶的结构。(3)依据理论计算出的支架阻力,考虑到厚煤层大采高条件下支架的适应能力,合理的对支架进行了选型,选取ZZ13000/28/60型支撑掩护式液压支架为8210大采高综采工作面的液压支架。由于大同矿区晋华宫煤矿为坚硬顶板,以及8210工作面的地质和生产技术条件,确定该大采高工作面以自然垮落为主爆破为辅的手段来管理坚硬顶板。最后现场对液压支架实测,分析了液压支架的适应性,进一步验证了合理支架的选型对厚煤层大采高开采条件下的重要性。
[Abstract]:Based on the problems of support pressure frame and coal wall cover under the condition of large mining height mining in thick coal seam, this paper takes the fully mechanized mining face of 402 disk area of Jinhuagong Coal Mine in Datong Mining area as the research background, and adopts the theoretical analysis respectively. The characteristics of roof movement and stress field distribution under the condition of large mining height in thick coal seam are analyzed by numerical simulation and field measurement. (1) the geology of 8210 face in Jinhuagong Coal Mine is taken as the condition. The law of roof movement and the distribution of stress field under the condition of large mining height in thick coal seam were studied by numerical simulation. The higher the mining height is, the more vulnerable the roof is to sliding and instability, and the larger the overlying rock subsidence is. When the key layer is broken by masonry beam structure, the peak value of coal wall leading support pressure is greater than the coal wall leading support pressure when sliding instability. The distance from the peak to the coal wall is less than the distance from the peak value to the coal wall when the slippage is unstable, and the higher the mining height, the higher the stress arch height of the key layer at the initial pressure. (2) the critical block breaking angle 伪 is taken as the variable. A mechanical model of the relationship between support and surrounding rock in large mining face is constructed. In this paper, the condition of the key block sliding instability is analyzed. When the other conditions are fixed, the probability of the key block sliding and losing stability is greater when the 伪 is smaller, and the support resistance required by the theoretical formula is not less than that of the 12.65MN/ frame. The method of numerical simulation is used to study the coal wall cover, and the result shows that the higher the mining height, the larger the range of coal wall cover. This paper expounds the mechanism of coal wall cover, and gives the preventive measures: (1) improving the performance of the support, (2) changing the physical and mechanical properties of the coal body in plastic zone, (3) destroying the structure of the basic roof by external force, (3) the support resistance calculated according to the theory, Considering the adaptability of the support under the condition of large mining height in thick coal seam, the type selection of the support is reasonable, and the ZZ13000/28/60 type support and cover type hydraulic support is selected as the hydraulic support in 8210 large mining height fully mechanized mining face. Because the Jinhuagong coal mine in Datong mining area is a hard roof and the geological and production technical conditions of the 8210 working face, it is determined that the main method of natural caving blasting is to manage the hard roof in this large mining face. Finally, the adaptability of the hydraulic support is analyzed, and the importance of the reasonable support selection to the mining condition of the thick coal seam is further verified.
【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;TD355
本文编号：2394811
[Abstract]:Based on the problems of support pressure frame and coal wall cover under the condition of large mining height mining in thick coal seam, this paper takes the fully mechanized mining face of 402 disk area of Jinhuagong Coal Mine in Datong Mining area as the research background, and adopts the theoretical analysis respectively. The characteristics of roof movement and stress field distribution under the condition of large mining height in thick coal seam are analyzed by numerical simulation and field measurement. (1) the geology of 8210 face in Jinhuagong Coal Mine is taken as the condition. The law of roof movement and the distribution of stress field under the condition of large mining height in thick coal seam were studied by numerical simulation. The higher the mining height is, the more vulnerable the roof is to sliding and instability, and the larger the overlying rock subsidence is. When the key layer is broken by masonry beam structure, the peak value of coal wall leading support pressure is greater than the coal wall leading support pressure when sliding instability. The distance from the peak to the coal wall is less than the distance from the peak value to the coal wall when the slippage is unstable, and the higher the mining height, the higher the stress arch height of the key layer at the initial pressure. (2) the critical block breaking angle 伪 is taken as the variable. A mechanical model of the relationship between support and surrounding rock in large mining face is constructed. In this paper, the condition of the key block sliding instability is analyzed. When the other conditions are fixed, the probability of the key block sliding and losing stability is greater when the 伪 is smaller, and the support resistance required by the theoretical formula is not less than that of the 12.65MN/ frame. The method of numerical simulation is used to study the coal wall cover, and the result shows that the higher the mining height, the larger the range of coal wall cover. This paper expounds the mechanism of coal wall cover, and gives the preventive measures: (1) improving the performance of the support, (2) changing the physical and mechanical properties of the coal body in plastic zone, (3) destroying the structure of the basic roof by external force, (3) the support resistance calculated according to the theory, Considering the adaptability of the support under the condition of large mining height in thick coal seam, the type selection of the support is reasonable, and the ZZ13000/28/60 type support and cover type hydraulic support is selected as the hydraulic support in 8210 large mining height fully mechanized mining face. Because the Jinhuagong coal mine in Datong mining area is a hard roof and the geological and production technical conditions of the 8210 working face, it is determined that the main method of natural caving blasting is to manage the hard roof in this large mining face. Finally, the adaptability of the hydraulic support is analyzed, and the importance of the reasonable support selection to the mining condition of the thick coal seam is further verified.
【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;TD355
【参考文献】
相关期刊论文 前6条
1 钱鸣高，张顶立，黎良杰，，康立勋，许家林;砌体梁的“S－R”稳定及其应用[J];矿山压力与顶板管理;1994年03期
2 闫少宏,贾光胜,刘贤龙;放顶煤开采上覆岩层结构向高位转移机理分析[J];矿山压力与顶板管理;1996年03期
3 缪协兴，钱鸣高;采矿工程中存在的力学难题[J];力学与实践;1995年05期
4 靳钟铭;;坚硬顶板长壁采场的悬梁结构及其控制[J];煤炭学报;1986年02期
5 缪协兴;采场老顶初次来压时的稳定性分析[J];中国矿业大学学报;1989年03期
6 于斌;段宏飞;;特厚煤层高强度综放开采水力压裂顶板控制技术研究[J];岩石力学与工程学报;2014年04期
相关博士学位论文 前1条
1 许猛堂;新疆巨厚煤层开采覆岩活动规律及其控制研究[D];中国矿业大学;2014年
相关硕士学位论文 前1条
1 胡国伟;大采高综采工作面矿压显现特征及控制研究[D];太原理工大学;2006年
本文编号：2394811
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2394811.html
