摘要
为进一步探究大倾角煤层长壁开采条件下工作面顶板覆岩运移的细节特征,以教学二矿大倾角煤层为研究案例展开研究。通过现场调研获取数据,应用FLAC 3D数值模拟软件建立开采工作面的数值模型,通过控制变量的实验方法,选取不进行充填、充填1/5、充填1/3、充填1/2和充填2/35种典型情况,分别对这5种典型情况下的顶板位移、应力分布和塑性区特征进行详细分析。结果表明,合理增大充填比有助于降低覆岩层的应力与位移值,并有助于降低煤层顶板破坏范围,同时工作面长度的延长对于顶板的力学性能存在更多的负面影响。因此最终确定充填比例为2/3,工作面长度75 m为相对合理的参数组合。
In order to further explore the characteristics of overlying rock movement in the roof of a working face under mining conditions of high dip coal seams,a certain high dip coal seam of the Teaching Second Mine was taken as a research case,and FLAC 3D numerical simulation software was used to build a numerical model of mining face.Through controlling variable experimental method,the five typical conditions of no filling,filling of 1/5,filling of 1/3,filling of 1/2 and filling of 2/3 were selected to carry out the analysis of roof displacement,stress distribution and plastic characteristics.The results show that reasonable increasing of filling ration is conducive to reduction of the stress and displacement of overlying rock strata and decreasing of the failure range of coal seam roof.At the same time,the extending of working face’s length has a negative effect on the mechanical performance of roof.Eventually,a reasonable parameter combination is determined with the filling ration of 2/3,and the working face length of 75 m.
作者
刘超峰
LIU Chaofeng(Zheng Coal Group Teaching Second Mine,Zhengzhou 452470,China)
出处
《陕西煤炭》
2024年第9期1-5,32,共6页
Shaanxi Coal
关键词
大倾角煤层
煤矸石
岩层运移规律
模拟分析
large dip angle coal seam
coal gangue
the movement law of rock layers
simulation analysis
