近距离煤层群开采工作面瓦斯涌出量预测方法研究
Study on prediction method of gas emission rate in mining faces of contiguous seams
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摘要: 在进行近距离煤层群开采工作面瓦斯涌出量预测时，下部煤层由于受上部多个煤层开采的影响，瓦斯会多次释放，瓦斯含量将大幅降低，利用行标所述方法进行下部煤层工作面瓦斯涌出量计算时，将不可避免地造成预测结果的偏差。为准确计算近距离煤层群开采时工作面的瓦斯涌出量，引入开采层对邻近层瓦斯涌出影响系数，对当前行标中开采层瓦斯涌出量计算公式和邻近层瓦斯涌出量计算公式中煤层原始瓦斯含量和煤层残存瓦斯含量进行了修正，提出了修正后的开采层瓦斯涌出量计算公式和邻近层瓦斯涌出量计算公式。利用修正后的计算公式对河北某矿近距离煤层群开采条件下各煤层回采工作面的瓦斯涌出量进行算例分析，并与传统计算方法进行比对，结果表明，两者之间在计算首采层瓦斯涌出量时结果基本一致，偏差为0.35 m3/t，其余各煤层回采工作面的瓦斯涌出量计算值均有较大幅度的偏差，偏差最大时，按标准所计算的结果是按修正后公式计算结果的4.45倍，两者偏差达到3.76 m3/t。结合矿井工作面实际瓦斯涌出情况，按照修正后的计算公式计算的工作面瓦斯涌出量结果更接近于矿井实际回采工作面的瓦斯涌出量，验证了所提出的修正后的开采层瓦斯涌出量计算公式和邻近层瓦斯涌出量计算公式的准确性。Abstract: In the prediction of gas emission rate from the mining face of contiguous seams,the lower coal seam is affected by the mining of multiple upper coal seams,gas will be released many times,and the gas content will be greatly reduced. When using the method described in the industry standard to calculate the gas emission rate of the lower coal seam working face,it will inevitably cause the deviations in the prediction results. In order to accurately calculate the amount of gas emitted from the working face during the mining of contiguous seams,the influence coefficient of gas emission in mining layer to adjacent layer was introduced and the original coal seam gas content and residual gas content in the coal seam in the calculation formula for gas emission from the mining layer in the standard and the gas emission from the adjacent layer have been revised and the revised gas emission calculation formula of the mining layer and the gas emission calculation formula of the adjacent layer were proposed. The revised calculation formula was used to calculate the gas emission of each coal seam mining face under the condition of mining contiguous seams in a mine in Hebei. The calculation examples were analyzed and compared with traditional calculation methods. The results show that calculation results of the gas emission from the first coal seam between the two are basically the same with a deviation value of 0.35 m3/t. The calculated values of the gas emission from the coal mining face in the remaining coal seams have a large deviation the largest deviation value is 3.76 m3/t,and the result calculated according to the method described in the industry standard is 4.45 times of the result calculated according to the revised formula. Combined with the actual situation of gas emission in the working face,the result of gas emission calculated according to the revised calculation formula is closer to the gas emission of the actual working face of the mine,thus verifying the accuracy of the revised calculation formula of gas emission in the mining layer and the calculation formula of gas emission in the adjacent layer.
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期刊类型引用(10)
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