采掘扰动对高应力厚煤层护巷煤柱的稳定性分析  

Stability Analysis of Mining Disturbance on Coal Pillar of High-Stress Thick Coal Seam

作　　者：韩庆庆 刘增辉[1] HAN Qingqing;LIU Zenghui(School of Mining Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China)

机构地区：[1]安徽理工大学矿业工程学院,安徽淮南市232001

出　　处：《矿业研究与开发》2023年第9期68-75,共8页Mining Research and Development

基　　金：国家自然科学基金项目(51974007,51874002)。

摘　　要：针对沿空掘巷及本段工作面采掘扰动对高应力厚煤层护巷煤柱的稳定性影响问题,以陕西金源招贤煤矿1305工作面为工程背景,通过理论分析、数值模拟及现场实践的方法,分析了采掘过程中煤柱内应力演化及基本顶的破断规律,给出了基本顶初次及二次破断后的力学模型,分析了采掘过程中工作面前40 m范围内护巷煤柱的应力和弹塑性区分布规律。结果表明:工作面采掘致使基本顶破断形成的三角块结构是造成煤柱失稳的重要因素;风巷掘进期间,应力集中区与峰值应力主要分布在采空区侧煤柱内,巷道侧煤柱基本稳定;1305工作面回采期间,工作面前方20 m范围内煤柱应力叠加现象明显且塑性区宽度增加幅度较大,在30 m和40 m处煤柱应力分布规律与掘巷期间相似且塑性区宽度增加较小。综上表明,工作面采动对前方20 m煤柱的稳定性影响严重。现场实践证明合理的支护参数设计能有效控制巷道围岩的稳定性。Aiming at the influence of gob-side entry driving and mining disturbance of working face on the stability of coal pillar in high stress thick coal seam,taking 1305 working face of Zhaoxian Coal Mine in Jinyuan,Shaanxi province as the engineering background,through theoretical analysis,numerical simulation and field practice,the stress evolution in coal pillar and the breaking law of basic roof during mining were analyzed.The mechanical model of the first and second breaking of the basic roof was given,and the stress and elastic-plastic zone distribution of the coal pillar in the range of 40 m in front of the working face during the mining process were analyzed.The results show that the triangular block structure formed by the basic roof breaking caused by the mining of the working face is an important factor causing the instability of the coal pillar.During the excavation of the air roadway,the stress concentration area and the peak stress are mainly distributed in the coal pillars on the side of the goaf,and the coal pillars on the side of the roadway are basically stable.During the mining period of 1305 working face,the stress superposition of coal pillars in the range of 20 m in front of the working face is obvious and the width of plastic zone increases greatly.The stress distribution law of coal pillars at 30 m and 40 m is similar to that during roadway excavation,and the width of plastic zone increases slightly.In summary,the mining of the working face has a serious impact on the stability of the 20 m coal pillar in front.Field practice has proved that reasonable support parameter design can effectively control the stability of roadway surrounding rock.

关 键 词：厚煤层 护巷煤柱 采掘扰动 沿空掘巷 稳定性分析 

分 类 号：TD822.3[矿业工程—煤矿开采]