远距离极薄煤层下保护层开采防突效果研究

发布时间：2018-04-13 02:17

本文选题：极薄下保护层 + 区域防突效果　；参考：《煤炭科学技术》2017年03期

【摘要】：为保证远距离极薄下保护层与其围岩一起开采的防突效果,降低过量开采煤层围岩产生的防突费用,以中泰公司为例,通过分析开采远距离极薄下保护层一8煤层对二1煤层保护效果的影响因素,计算出一8煤层不同采高下二1煤层在"上三带"的位置;运用RFPA2D模拟下保护层采高为0.5、1.0、1.5 m时二1煤层的变形情况。综合理论分析和模拟结果,确定保护层开采高度为1 m时,二1煤层透气性系数增大106倍,最大膨胀变形量达0.613%。现场试验表明,一8煤层工作面采高为1 m时,二1煤层被保护范围内本煤层瓦斯抽采量达到14 m~3/min,煤层最大残存瓦斯含量仅为1.83 m~3/t,被保护层取得了良好的区域防突效果。
[Abstract]:In order to ensure the outburst prevention effect of the remote extremely thin protective layer mining with its surrounding rock, and to reduce the outburst prevention cost caused by the surrounding rock of over-mining coal seam, the case of Zhongtai Company is taken as an example.Based on the analysis of the factors that affect the protection effect of coal seam No. 8 in long distance and extremely thin coal seam, the position of coal seam No. 2 at different mining heights in the "upper and third zone" is calculated.RFPA2D is used to simulate the deformation of coal seam No. 1 when the mining height of protective layer is 0.5 ~ 1.0m.Based on the theoretical analysis and simulation results, it is determined that when the mining height of the protective layer is 1 m, the permeability coefficient of the second coal seam increases by 106 times, and the maximum swelling deformation reaches 0.613.The field test shows that when the mining height of the first 8 coal seam is 1 m, the gas extraction capacity of the coal seam within the protected area of the second coal seam is 14 mm2 / 3 / min, and the maximum residual gas content of the coal seam is only 1.83 mm3 / t. The protected layer has achieved a good regional outburst prevention effect.
【作者单位】：河南理工大学安全科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室——省部共建国家重点实验室培训基地;鹤壁中泰矿业有限公司;
【分类号】：TD713.3

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