煤厚变化对冲击地压影响的数值模拟分析
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摘要
为了研究煤层厚度变化在开采过程中发生冲击地压概率的影响,基于FLAC3D数值模拟软件,分别模拟了不同煤厚与不同煤厚变化区长度在煤厚局部变化区支承压力与弹性应变能的分布规律。结果表明:煤厚变化区长度相同时,煤厚分别从4、6、8 m逐渐变为1 m的过程中,煤厚变化率越大,煤厚局部变化区应力集中程度越高,相应地发生冲击地压的概率也越大;煤层厚度相同时,煤厚局部变化区长度从10 m逐渐变为30 m的过程中,变化区长度越大,局部变化区的应力集中程度越低,即煤厚变化区发生冲击地压的概率与煤厚变化率的增加呈正相关,与煤厚变化区长度的增加呈负相关。
In order to study the influence of coal seam thickness change occurred in the process of mining on rock burst probability, FLAC3 Dnumerical simulation is used to simulate the distribution laws of abutment pressure elastic strain energy of different coal thickness and coal thickness change area length in thickness change area. The result shows that the larger of the coal seam change rate is, the higher of the stress concentration in local change area and more probability of rock burst will be when the length of coal seam change area is the same in the process of coal thickness changing from 8 m, 6 m,4 m to 1 m; the larger of the change area is, the lower of stress concentration in the area will be when the coal thickness is the same in the process of local change area changing from 10 m to 30 m. In other words, the probability of rock burst in coal thickness change area is positively correlated with the increase rate of coal thickness, and shows a negative correlation with the increase of coal thickness change area length.
In order to study the influence of coal seam thickness change occurred in the process of mining on rock burst probability, FLAC3 Dnumerical simulation is used to simulate the distribution laws of abutment pressure elastic strain energy of different coal thickness and coal thickness change area length in thickness change area. The result shows that the larger of the coal seam change rate is, the higher of the stress concentration in local change area and more probability of rock burst will be when the length of coal seam change area is the same in the process of coal thickness changing from 8 m, 6 m,4 m to 1 m; the larger of the change area is, the lower of stress concentration in the area will be when the coal thickness is the same in the process of local change area changing from 10 m to 30 m. In other words, the probability of rock burst in coal thickness change area is positively correlated with the increase rate of coal thickness, and shows a negative correlation with the increase of coal thickness change area length.
引文
[1]齐庆新,窦林名.冲击地压理论与技术[M].徐州:中国矿业大学出版社,2008.
[2]钱鸣高,石平五,许家林.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2010.
[3]孙振武.煤层厚度局部变化区域地应力场分布的数值模拟[J].矿山压力与顶板管理,2003(3):95-97.
[4]齐黎明,陈学习,薛俊华.煤层赋存状态突变对动力灾害的影响[J].煤炭工程,2012,44(12):92-94.
[5]牛森营.豫西煤厚变化控制煤与瓦斯突出的机理分析[J].煤矿安全,2011,42(7):127-128.
[6]赵同彬,郭伟耀,谭云亮,等.煤厚变异区开采冲击地压发生的力学机制[J].煤炭学报,2016,41(7):1660.
[7]沈腾飞,顾士坦,雷瑞德,等.煤厚变化处弹性应变能分布规律及影响因素[J].煤矿安全,2015,46(6):187.
[8]任衷平,王春秋,蒋邦友,等.煤厚变化对采场冲击危险影响的数值模拟[J].煤矿安全,2014,45(12):51.
[2]钱鸣高,石平五,许家林.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2010.
[3]孙振武.煤层厚度局部变化区域地应力场分布的数值模拟[J].矿山压力与顶板管理,2003(3):95-97.
[4]齐黎明,陈学习,薛俊华.煤层赋存状态突变对动力灾害的影响[J].煤炭工程,2012,44(12):92-94.
[5]牛森营.豫西煤厚变化控制煤与瓦斯突出的机理分析[J].煤矿安全,2011,42(7):127-128.
[6]赵同彬,郭伟耀,谭云亮,等.煤厚变异区开采冲击地压发生的力学机制[J].煤炭学报,2016,41(7):1660.
[7]沈腾飞,顾士坦,雷瑞德,等.煤厚变化处弹性应变能分布规律及影响因素[J].煤矿安全,2015,46(6):187.
[8]任衷平,王春秋,蒋邦友,等.煤厚变化对采场冲击危险影响的数值模拟[J].煤矿安全,2014,45(12):51.