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为解决厚煤层综放双巷布置工作面巷间煤柱的留设问题,以某矿四盘区4301工作面运输顺槽与辅助运输顺槽之间的煤柱为工程背景,首先对巷间煤柱进行理论分析:一次采动影响后将巷间煤柱沿倾向划分为采动影响区、相对稳定区和锚杆支护区,应用极限平衡理论分析得出了一次采动影响区的宽度为2.82 m,进而得出巷间煤柱的宽度为7.83 m。其次,应用数值模拟的方法系统地分析了宽度分别为4、6、8、10、12、15、20 m时,在两次采动影响下巷间煤柱的应力演化、破坏、巷道围岩变形规律;一次采动影响后,随着煤柱宽度增大,髙应力由实体煤向煤柱内转移;给出了最大临界尺寸、最小临界尺寸的定义,并指出巷间窄煤柱宽度应小于最大临界尺寸。综合分析数值模拟研究结果,同时结合理论分析结果及煤柱留设原则,最终确定巷间煤柱宽度为8 m。最后,通过现场工程实践验证了所确定的巷间煤柱宽度的合理性。研究结果对类似条件下综放双巷布置工作面巷间煤柱宽度的确定具有参考意义。
In order to solve the problem of coal pillars in the double-lane caving face of thick coal seam with fully mechanized top-coal caving, with the pillars between the trough and the auxiliary trough of 4301 in the four-panel area of a mine as the engineering background, Coal pillars are analyzed theoretically. After coal mining is affected by a mining move, the coal pillars in the roadway are divided into mining affected area, relative stability area and bolt supporting area along the dip direction. The width of the mining affected area Is 2.82 m, and then the width of the pillars in the lane is 7.83 m. Secondly, the numerical simulation method was used to systematically analyze the stress evolution and failure of pillars under the influence of two mining actions when the widths were 4, 6, 8, 10, 12, 15 and 20 m respectively. After the influence of a mining action, as the coal pillar width increases, the 髙 stress is transferred from the solid coal to the coal pillar. The definition of the maximum critical dimension and the minimum critical dimension is given. The width of the narrow coal pillar in the lane should be Less than the maximum critical size. The results of numerical simulation are comprehensively analyzed. Based on the results of theoretical analysis and the principle of leaving pillars, the width of pillars in the laneway is finally determined to be 8 m. Finally, the reasonableness of the width of pillars determined in the tunnel was verified by field engineering practice. The research results have reference meaning for the determination of coal pillar width in alluvial caving face of double-decked caving face under similar conditions.