缓倾斜特厚煤层重复采动下回风大巷稳定性研究
Stability of return air roadway under repeated mining in gently inclined extra-thick coal seam
杨旭 1孔令宇 1孟凡燃 1马翔宇 1骆俊辉1
作者信息
- 1. 国家能源集团新疆能源有限责任公司,新疆乌鲁木齐 831215
- 折叠
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.
Abstract
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 numer-ical 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 slow-ly,and the support distance of the return air main roadway decreases by 17.5％,18.75％,13.75％and 8.75％.On the ba-sis 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.
关键词
重复采动/数值模拟/巷道稳定性/覆岩移动角Key words
repeated mining/numerical simulation/roadway stability/overlying rock movement angle引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据