岩梁假设下顶板变形机制与空顶距优化研究  

Roof deformation mechanism and unsupported roof distance optimization under rock beam assumption

作　　者：刘建胜 赵利安[2] 李达 鲁忠良[3] LIU Jiansheng;ZHAO Li’an;LI Da;LU Zhongliang(Hejin Tenghui Coal Industry Co.,Ltd.,Huozhou Coal Electricity Group,Hejin 043300,China;School of Mining,Liaoning Technical University,Fuxin 123000,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]霍州煤电集团河津腾晖煤业有限责任公司,山西河津043300 [2]辽宁工程技术大学,辽宁阜新123000 [3]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《煤炭工程》2023年第10期49-54,共6页Coal Engineering

基　　金：国家自然科学基金项目(51174109)。

摘　　要：为解决煤矿井下煤巷掘支效率低,掘支工艺参数选取不合理,增加空顶区冒顶风险,严重影响生产效率等问题,运用理论分析、数值模拟与现场试验等方法,结合河津腾晖煤业北翼(2-2052)巷道的地质条件,运用岩梁理论建立了矩形巷道围岩物理力学模型,推导了空顶区顶板的拉应力和挠度方程,探讨了空顶距离、巷道宽度与顶板支撑强度等因素对空顶区顶板稳定性的影响,利用FLAC三维数值模拟软件重点分析了空顶距离对顶板的影响,确定了的合理空顶距离。结果表明:巷道的直接顶是掘进过程中空顶区顶板围岩稳定性的关键,空顶区顶板在拉剪的共同作用下发生破坏,分析了不同迎头距离的顶板围岩的垂直应力状况,并考虑到空顶区的安全系数,综合得出极限空顶距离为4 m。在试验期间内,其顶板最大的沉降变形量为62 mm,掘进迎头空顶区顶板未发生过冒顶的现象,整个服务期间顶板稳定性好,其掘进速度提高了一倍,达到了月进尺400 m的良好效果。As the production efficiency is seriously restricted by the low efficiency of coal roadway excavation and support,and the increased risk of roof fall in the unsupported roof area caused by unreasonable parameters for excavation and support process,theoretical analysis,numerical simulation and field test are used.Combining with the geological conditions of the north wing(2-2052)of Hejin Tenghui Coal Industry,the physical and mechanical model of the surrounding rock of the rectangular roadway is established based on rock beam theory.The tensile stress and deflection equations of the roof in the unsupported roof area are derived,and the influence of the unsupported roof distance,roadway width and roof support strength on the roof stability in the unsupported roof area is discussed.The FLAC3D numerical simulation software was used to analyze the influence of the unsupported roof distance on the roof,and the reasonable unsupported roof distance was determined.The results show that the immediate roof of the roadway is the key to the stability of the roof surrounding rock in the unsupported roof area during the excavation.The roof is destroyed under the combined action of tension and shear.The vertical stress conditions of the roof surrounding rock with different face width(2,4,6,8 m)are analyzed.Considering the safety factor of the unsupported roof area,the ultimate unsupported roof distance is 4 m.During the test period,the maximum settlement deformation of the roof is 62 mm,and non roof caving has occurred in the unsupported roof area of the heading face.During the whole service period,the roof stability is perfect,and the tunneling speed is doubled,reaching a favorable effect of 400 m per month.

关 键 词：回采巷道 岩梁理论 顶板变形特征 空顶距离 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]