迎采对掘过程中切顶前后巷道围岩稳定性控制技术研究  

Research on Stability Control Technology of Surrounding Rock of the Roadway Before and After Roof Cutting in the Process of Face to Face Mining

作　　者：刘荣科 马振乾[1] 郑行行 黄青荣 帅运林 LIU Rongke;MA Zhenqian;ZHENG Hanghang;HUANG Qingrong;SHUAI Yunlin(Mining College,Guizhou University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025

出　　处：《矿业研究与开发》2024年第2期47-55,共9页Mining Research and Development

基　　金：国家自然科学基金项目(52274116);贵州省教育厅科技拔尖人才项目(黔教技[2022]072号);贵州省科技计划项目(黔科合人才平台[2021]5610);贵州省科技支撑计划项目(黔科合支撑[2021]一般352)。

摘　　要：为解决迎采对掘沿空掘巷过程中巷道围岩变形严重、支护困难等问题,以文家坝煤矿A110607回风巷为工程背景,采用数值模拟、实验室试验及现场实测等方法,研究迎采对掘沿空掘巷过程中切顶前后巷道围岩稳定性。结果表明:预裂切顶降低了上覆岩层的应力叠加效应,巷道围岩位移和应力变化相较于未切顶时大幅下降,在掘进工作面滞后回采工作面20 m时,小煤柱和实体煤帮峰值应力均达到最大值,随着掘进与回采工作面的推进,巷道围岩变形量逐渐增大,最后趋于稳定;在+20~-60 m范围内,切顶后相较于未切顶巷道围岩变形量大幅度下降,最大降幅在-60 m处,顶底板移近量减少了40.7%,两帮移近量减少了33.3%;迎采对掘沿空掘巷(强采动巷道)受动力扰动影响剧烈,巷道从掘进开始至相邻工作面回采完毕,需经历工作面采动扰动及巷道掘进扰动影响,势必引起沿空巷道覆岩运动,使得巷道维护困难加大。据此,提出了以“卸-固-支”协同控制技术为核心的强采动巷道围岩结构稳定性控制方案,现场应用表明,该技术能有效控制巷道围岩变形,实现对强采动巷道围岩的稳定性控制。In order to solve the problems of serious deformation and difficult support of surrounding rock in the process of gob-side entry retaining during face to face mining,taking A110607 return airway of Wenjiaba Coal Mine as the engineering background,the stability of surrounding rock before and after roof cutting in the process of gob-side entry retaining during face to face mining was studied by means of numerical simulation,laboratory test and field measurement.The results show that the pre-splitting roof cutting reduces the stress superposition effect of the overlying strata,and the displacement and stress changes of surrounding rock of the roadway are greatly reduced compared with those without roof cutting.When the excavation face lags 20 m behind the mining face,the peak stress of the small coal pillar and the solid coal side reaches the maximum.With the advancement of the excavation and the mining face,the deformation of surrounding rock of the roadway gradually increases and finally tends to be stable.In the range of+20 to-60 m,the deformation of surrounding rock of the roadway after roof cutting is greatly reduced compared with that of the uncut roadway,and the maximum reduction is at-60 m.The amount of roof and floor movement is reduced by 40.7%,and the amount of two-sides movement is reduced by 33.3%.The impact of gob-side entry retaining during face to face mining(strong mining roadway)is severe.From the beginning of the excavation to the completion of the adjacent working face,the roadway needs to experience the mining disturbance of the working face and the disturbance of the roadway excavation,which is bound to cause the overburden movement of the roadway along the goaf,making the roadway maintenance more difficult.Based on this,a stability control scheme of surrounding rock structure of strong mining roadway with“unloading-solid-support”collaborative control technology as the core is proposed.The field application shows that the technology can effectively control the deformation of surrounding roc

关 键 词：迎采对掘 沿空掘巷 切顶卸压 强采动 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]