煤厚变化对冲击地压影响的数值模拟分析  

Numerical Simulation Analysis of Influence of Coal Thickness Change on Rock Burst

作　　者：王勇[1,2] 杨毕 邓川 张进红 鲁蒙[2] 黄家远[2] 谢春妹[2] 黄兴[2] 

机构地区：[1]贵州民族大学建筑工程学院,贵州贵阳550025 [2]煤炭工业石家庄设计研究院贵州分院,贵州贵阳550001 [3]贵州省能源局,贵州贵阳550001 [4]贵州安和矿业科技工程股份有限公司,贵州贵阳550001 [5]贵州省清镇市安监局,贵州清镇551400

出　　处：《煤矿安全》2017年第5期198-201,共4页Safety in Coal Mines

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, FLAC^3D numerical 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.

关 键 词：煤厚变化 支承压力 冲击地压 弹性应变能 应力差值 

分 类 号：TD324.1[矿业工程—矿井建设]