综采与综放工艺条件下采场矿压特征分析
Analysis on Strata Pressure Features of Mining Face Under Conditions of Fully Mechanized Coal Mining and Fully Mechanized Top Coal Caving Mining
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摘要: 基于相同顶板条件下,综采工艺与综放工艺的平均矿压显现特征差异,为给支架选型与顶板管理提供基础依据,以某矿217工作面为例,采用支架压力记录仪实时记录支架工作阻力,结合工作面矿压显现进行顶板来压特征分析。通过分析放煤阶段和不放煤阶段的支架阻力变化,研究综采与综放工艺的顶板来压特征之差异。研究结果表明:与综采工艺相比,综放工艺支架阻力显著增加,动载系数1.30～1.41,顶板来压强烈,基本顶周期来压步距从平均22 m减小到平均11 m,明显减小。在倾斜方向上,中部基本顶来压最强烈,其次是下部、上部,工作面周期来压较强烈。Abstract: Based on the same roof conditions, the differences of the average mine pressure behavior between the fully mechanized coal mining and the fully mecha nized top coal caving mining were the key issue to be noted in the coal mining industry, in order to provide the basic references to the powered support selection and th e face roof management.Taking 217 coal mining face as an example, the pressure recorder of the powered support was applied to on-timely record the working resistan ce of the powered support.In combination with the strata pressure behaviors of the coal mining face, the roof pressurized features was analyzed.With the analysis on th e resistance variation of the powered support at the top coal caving stage and at the no top coal caving stage, the differences of the roof pressurized features between t he fully mechanized coal mining technique and the fully mechanized top coal caving mining technique were studied.The study results showed that in comparison with th e fully mechanized coal mining, the powered support resistance at the fully mechanized top coal caving would be obviously increased, the dynamic load coefficient woul d be 1.301.41, the roof pressurized would be serious, the periodical pressurized distance of the basic roof would be obviously reduced from 22 m in average to 11 m in average.On the inclined orientation, the middle basic roof pressurized was most serious, the low section and top section of the basic roof pressurized were less serious.
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