突出矿井保护层选择及开采顺序的研究

发布时间：2018-05-16 02:03

本文选题：保护层 + 数值模拟　；参考：《贵州大学》2015年硕士论文

【摘要】：对于突出矿井保护层的选择,传统的方法多以煤质好为优先开采原则,而不是优先选择开采突出危险性小或没有突出性的煤层。通过大量现场调研结果来看,某些矿井没有合理的选择保护层,而是选择煤质好、煤层厚的煤层进行开采,造成邻近层瓦斯涌出严重,又没有科学、系统具有针对性的瓦斯治理措施,这样导致煤矿事故频发,因此,保护层选择及煤层群开采顺序研究势在必行。本课题在广泛收集资料及大量现场调研的基础上,针对湘能集团义忠煤矿具体情况,结合理论分析,运用SQL Server2008与Visual Studio2010平台及C#语言,开发了“突出矿井保护层选择系统”。通过FLAC3D数值模拟,分别对突出矿井保护层选择、被保护层采掘接替始终处于保护层保护范围内以及煤层群开采顺序的研究。运用计算机数值模拟建立突出矿井保护层选择系统,通过多因素多指标的权重分析,系统建立了第一、二、三级参考标准,输入矿井煤层实测参数后,系统会通过事先编译好的后台命令进行纵、横向的对比分析,使模拟结果更加数值化、具体化,根据矿井各自的情况可以优化得出合适的保护层。针对义忠煤矿,系统成功的优化出14号煤层作为保护层比较理想,此系统应用到金佳矿中煤组的6层煤中选择保护层,最后优化出22号煤层作为保护层较理想,从金佳矿已开采的情况来看,选择22号煤层作为下保护层开采效果不错,并取得成功。保护层选择后,研究分析被保护层的采掘接替工作,应用FLAC3D对保护层的保护范围、以及下保护层开采后对各煤层影响等进行大量的数值模拟,发现通过无煤柱护巷与专用瓦斯巷的合理布置,在保护层回采完两个区段工作面后,可以实现被保护层采掘接替始终处于保护层保护范围以内这一技术,而通过模拟各被保护层最大垂直主应力、垂直应力、垂直位移、塑性区及水平方向位移的变化分布情况,可以得出煤层应力释放和各煤层膨胀变形情况,更好的掌握了保护层开采被保护层采掘工作处于保护范围内这样一个过程。
[Abstract]:For the selection of protective layer of outburst mine, the traditional method takes the good quality of coal as the first mining principle, not the coal seam with low risk of outburst or no outburst. According to a large number of site investigation results, some mines do not choose a reasonable protective layer, but choose the coal seam with good quality and thick coal seam for mining, which results in serious gas emission from adjacent strata and no science. The system has targeted gas control measures, which leads to frequent accidents in coal mines. Therefore, it is imperative to study the selection of protective layer and mining sequence of coal seams. Based on the extensive collection of data and a great deal of field investigation, according to the concrete situation of Xiangneng Group Yizhong Coal Mine, combined with the theoretical analysis, using SQL Server2008, Visual Studio2010 platform and C # language, the paper develops the "system for selecting the protective layer of outburst mine". Through the numerical simulation of FLAC3D, the selection of protective layer in outburst mine, the mining replacement of protected layer is always within the protection range of protective layer and the mining sequence of coal seam group is studied respectively. The selection system of outburst mine protective layer is established by computer numerical simulation. Through the weight analysis of multiple factors and indexes, the first, second and third level reference standards are established, and the measured parameters of coal seam are inputted. The system will make the simulation result more numerical and concrete by compiling the background command in advance to make the comparative analysis of longitudinal and horizontal. According to the mine's respective situation, the suitable protective layer can be optimized. In view of Yizhong coal mine, the system successfully optimizes 14 coal seam as the protective layer, this system is applied to choose the protective layer in the 6 layers of the coal group in Jinjia mine, and finally optimizes the 22 coal seam as the protective layer. According to the mining situation of Jinjia Coal Mine, the mining effect of No. 22 coal seam as the lower protective layer is good, and it is successful. After the protection layer is selected, the excavation and replacement work of the protected layer is studied and analyzed, and a large number of numerical simulations are carried out on the protection range of the protective layer by using FLAC3D, and on the influence of the mining of the lower protective layer on the coal seams. It is found that through the reasonable arrangement of protecting roadway and special gas roadway without coal pillar, after mining two section working faces in protective layer, the technology of mining and replacing the protected layer can be realized all the time within the protective layer protection range. By simulating the variation and distribution of maximum vertical principal stress, vertical displacement, plastic zone and horizontal displacement in each protected layer, the stress release of coal seam and the swelling deformation of each seam can be obtained. A better grasp of the protective layer mining protected layer mining work in the protection of such a process.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.82

【参考文献】