Determination of Reasonable Advancing Speed of Fully Mechanized Top-coal Caving Face Based on Prevention and Control of Residual Coal Spontaneous Combustion
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摘要: 为了研究综放工作面推进速度对采空区遗煤自燃的影响规律，采用理论分析、数值模拟、相似模拟及回归分析等方法，对工作面推进速度与工作面采出率、采空区应力场、孔隙率分布规律、漏风量，以及氧化带宽度的关系进行了研究，得到工作面推进速度与各因素的函数关系，以及工作面推进速度的合理确定方法。分析结果表明：防止遗煤自燃的工作面推进速度存在下限值和上限值，当利用上限值和下限值估算的工作面合理推进速度范围存在并且具有较大变化空间时，再对采出率加以考虑，即可得到有效防止遗煤自燃的合理工作面推进速度；当此范围不存在或范围较小时，说明提高工作面推进速度不能防止遗煤自燃，这时工作面的合理推进速度应主要依据采出率进行确定。工作面推进速度越小，与氧化带宽度的关系曲线越平缓，提高推进速度越有利于防止遗煤自燃。Abstract: In order to study the effect laws of the advancing speed of the working face on the residual coal spontaneous combustion in the gob, study was carriied out in this paper on the the relationships of the advancing speed of the working face with the recovery rate, the distribution rule of the stress field and the porosity in the gob, the air leakage and the width of oxidation zone by means of the theoretical analysis, numerical simulation, similar simulation and regression analysis, the functional relations of the advancing speed of the working face with each factor and the reasonable determination method for the advancing speed of the working face were obtained. The analysis results showed that the lower limit and upper limit of the advancing speed of the working face existed for the prevention of residual coal spontaneous combustion, when there was a range of the reasonable advancing speed of the working face which was estimated with the lower and upper values, it had a larger changing space and the recovery rate was taken into consideration, the reasonable advancing speed of the working face for the effective prevention of residual coal spontaneous combustion can be obtained; when this range did not exist or was small, it indicated that the increase of the advancing speed of the working face can't prevent the residual coal spontaneous combustion, then the reasonable advancing speed of the working face should be determined by the recovery rate. If the advancing speed was slower and the relation curve with the width of the oxidation was more gentle, the increase of the advancing speed of the working face was more beneficial to the prevention of residual coal spontaneous combustion.
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[1] 秦波涛,王德明.矿井防灭火技术现状及研究进展[J].中国安全科学学报,2007,17(12):80-85. [2] 张春,题正义,李宗翔.综放采空区遗煤厚度的分布规律及模拟研究[J].安全与环境学报,2012,12(6):203-207. [3] 庄楚强,吴亚森.应用数理统计基础[M],广州:华南理工大学出版社,2002. [4] 张春,题正义,李综翔.采空区加荷应力场及其多场耦合研究[J].长江科学院院报,2012,29(3):50-54. [5] 张春,题正义,李宗翔.综放支承压力峰值位置的理论及回归分析[J].中国安全科学学报,2011,21(9):88-93. [6] 谢广祥,常聚才,华心祝.开采速度对综放面围岩力学特征影响研究[J].岩土工程学报,2007,29(7):963-967. [7] 高建良,王海生.采空区渗透率分布对流场的影响[J].中国安全科学学报,2010,20(3):85-89. [8] 邓军,孙战勇.综放面自燃危险区域及最小推进速度确定[J].西安科技学院学报,2002,22(2):119-122. [9] 李宗翔,许端平,刘立群.采空区自然发火"三带"划分的数值模拟[J].辽宁工程技术大学学报,2002,21(5):55-79. [10] 张春,题正义,李宗翔.综放采空区遗煤自燃的三维数值模拟研究[J].中国安全科学学报,2013,23(5):15-21.
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