摘要
针对煤层群开采后覆岩复杂破坏的特征,为保证回风大巷施工使用期间的安全稳定,采用数值模拟和理论分析相结合的方法,建立不同工作面布置方式的煤层开采数值模拟,研究巷道合理支护范围及支护强度。研究表明,在工作面开采过程中,周围煤岩体中覆岩应力重新分布,当B1煤层工作面开采后,回风大巷受影响范围为80 m,随着下顺槽北移距离的不断增大,巷道围岩垂直应力降幅较缓,回风大巷支护距离降幅为17.5%、18.75%、13.75%、8.75%。在考虑巷道稳定性及提高煤炭资源回收率等因素的基础上,最终确定上顺槽北移4.5 m,该研究成果可为巷道安全掘进提供指导。
In view of the complex failure characteristics of the overlying rock after coal seam group mining,and in order to ensure the safety and stability of the return air roadway during construction and use,we use the method of combining numerical simulation and theoretical analysis to establish the numerical simulation of coal seam mining with different working face layouts,and to study the reasonable support range and support strength of the roadway.The research shows that:during the mining process of the working face,the stress of the overlying rock in the surrounding coal and rock mass is redistributed.When the B1 coal seam working face is mined,the affected area of the return air roadway is 80 m,and the distance increases with the northward movement of the down channel.,the vertical stress of the surrounding rock of the roadway decreases slowly,and the support distance of the return air main roadway decreases by 17.5%,18.75%,13.75% and 8.75%.On the basis of considering the stability of the roadway and improving the recovery rate of coal resources,it's finally determined that the upper trough moves northward by 4.5m,and the research results can provide guidance for the safe excavation of the roadway.
作者
杨旭
孔令宇
孟凡燃
马翔宇
骆俊辉
YANG Xu;KONG Lingyu;MENG Fanran;MA Xiangyu;LUO Junhui(CHN Energy Xinjiang Energy Co.,Ltd.,Urumqi 831215,China)
出处
《陕西煤炭》
2024年第7期76-81,共6页
Shaanxi Coal
关键词
重复采动
数值模拟
巷道稳定性
覆岩移动角
repeated mining
numerical simulation
roadway stability
overlying rock movement angle
