摘要
为研究厚煤层小煤柱沿空巷道的围岩变形特征及支护技术,解决巷道的失稳难题,以魏家地煤矿西2305运输顺槽为研究对象,采用理论分析及数值模拟对小煤柱巷道围岩结构形态及应力分布状态进行分析,采用现场实测的方式对沿空巷道围岩变形及支护参数展开研究。研究表明,小煤柱巷道围岩应力受一次回采影响呈非对称性,煤柱受力与上覆岩层载荷及悬露基本顶岩块长度成正比,与煤柱宽度成反比;小煤柱沿空巷道在掘进期间,围岩变形量相对较小,且变形沿巷道中轴线呈高度对称性;一次回采后,巷道围岩在煤柱侧变形和破坏较大,巷道变形呈非对称性。基于现场实测所得巷道围岩变形特征,提出了加强锚索进行小煤柱巷道的加固。通过现场工业性实验,加强支护后,煤柱侧帮部变形量减小至原来的58.3%,有效控制巷道围岩变形,减小煤柱帮部变形严重的问题。
In order to study the deformation characteristics and support technology of surrounding rock of small coal pillars roadway excavation along goaf in thick coal seams,and solve the difficult problem of instability of the roadway,the west 2305 transportation crossheading of Weijiadi Coal Mine is taken as the research object.Theoretical analysis and numerical simulation are used to analyze the structural form and stress distribution state of the surrounding rock of the small coal pillar roadway.The deformation and support parameters of the surrounding rock of the roadway along goaf are studied through on-site measurement.The surrounding rock stress of the small coal pillar roadway is asymmetrical under the influence of one stoping.The force of the coal pillar is directly proportional to the load on the overlying rock layer and the length of the hanging basic roof rock block,and inversely proportional to the width of the coal pillar;during the excavation of the small coal pillar roadway along goaf,the deformation amount of the surrounding rock is relatively small,and the deformation is highly symmetrical along the central axis of the roadway;after one stoping,the surrounding rock of the roadway undergoes significant deformation and damage on the coal pillar side,and the deformation of the roadway is asymmetric.Based on the deformation characteristics of the roadway surrounding rock measured on site,it is proposed to strengthen the anchor cable for the reinforcement of the small coal pillar roadway.Through on-site industrial experiments,it is found that after strengthening the support,the deformation amount of the coal pillar sidewall decreased to 58.3%of the original amount,effectively controlling the deformation of the roadway surrounding rock and reducing the problem of severe deformation of the coal pillar sidewall.
作者
李文忠
文建东
赵洋
Li Wenzhong;Wen Jiandong;Zhao Yang(Gansu Jingmei Energy Co.,Ltd.Weijiadi Coal Mine,Gansu Baiyin 730913)
出处
《山东煤炭科技》
2024年第3期39-43,共5页
Shandong Coal Science and Technology
关键词
厚煤层
沿空
巷道
支护
thick coal seam
along goaf
roadway
support
