坚硬顶板切顶成巷结构演化与稳定控制机理  

Structure evolution and stability control mechanism of hard-roof cutting for roadway retaining

作　　者：杨红运 李勇[2] 刘延保[3] 曹树刚[2] 潘瑞凯[2] 王辉[2] 王波[3] 陈相[1] 赵小龙[4] YANG Hongyun;LI Yong;LIU Yanbao;CAO Shugang;PAN Ruikai;WANG Hui;WANG Bo;CHEN Xiang;ZHAO Xiaolong(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam,Chongqing University,Chongqing 400044,China;State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;SinopecShengli Oilfield Company,Dongying,Shandong 257000,China)

机构地区：[1]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [3]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [4]中国石化胜利油田分公司,山东东营257000

出　　处：《采矿与安全工程学报》2021年第4期766-773,共8页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金青年科学基金项目(51904043,51911530152);重庆市技术创新与应用示范(社会民生类)一般项目(cstc2018 jscx-msybX0067);重庆市自然科学基金项目(cstc2020jcyj-msxmX0570);煤矿灾害动力学与控制国家重点实验室自主课题项目(2011DA105287-MS201903);中央高校基本科研业务费专项资金项目(2020CDJQY-A046)。

摘　　要：为深入了解坚硬顶板切顶成巷结构演化过程及稳定控制机理,采用物理试验、连续-非连续介质模拟试验、力学分析开展研究。结果表明:切割顶板在采空区侧形成长悬臂梁结构,切割端首先旋转下沉,未切割端首先破断,当切割端顶板触底后,切割顶板沿中部断裂;切顶扰动对采空区顶板结构的影响主要集中在切割顶板岩层,对上覆岩层结构影响较小;切割顶板在巷道上方形成短悬臂梁结构,进一步变形后在煤体深部产生垂直张拉裂缝,然后向采空区旋转变形,并与采空区垮落切割顶板接触,形成平衡结构;切顶高度及切顶角参数对平衡结构的力学作用有较大影响,当切顶角增加到一定值时,平衡结构关键点之间的作用力比较接近,可满足不同部位的顶板岩体协调变形。To deeply understand structural evolution process and stability control mechanism of hard-roof cutting for roadway retaining,the research was carried out through physical test,continuous-discontinuous medium simulation test,and mechanical analysis.The results have shown that the cutting roof forms a long cantilever beam structure on the side of the goaf.The cutting end first rotates and sinks,and the uncut end first breaks.When the cutting end roof touches the bottom,the cutting roof breaks along the middle.The influence of roof-cutting disturbance on the roof structure of goaf is mainly concentrated on the cutting roof strata,having little effect on the overlying strata structure.The cutting roof forms a short cantilever beam structure above the roadway.After further deformation,vertical tensile cracks appear in the deep coal body,rotate,and then deform toward the goaf in contact with caving cutting roof of the goaf to form a balanced structure.The cutting height and cutting angle have great influence on mechanical action of balance structure.When the cutting angle increases to a certain value,the force between key points of balance structure was relatively close,which can meet the coordinated deformation of roof-rock-mass in different parts.

关 键 词：坚硬顶板 切顶成巷 结构演化 稳定控制 

分 类 号：TD322[矿业工程—矿井建设]