摘要
针对浅埋大断面巷道快速掘进中因围岩表面不平整导致锚杆托板严重破坏引发支护失效的问题,采用实验室试验、数值模拟及理论分析相结合的方法对锚杆托板组合构件协调作用机理进行研究,构建锚杆托板组合构件力学模型,分析托板和调心垫圈在偏载作用下受力演化特征及不同锚杆托板组合作用下巷道的支护效果。小保当112207工作面大断面切眼巷道工业性试验结果表明:当锚杆托板组合构件协调性良好时,能有效降低锚杆尾部应力集中程度,提高锚杆预紧力,锚杆尾部不易发生损坏变形,且有助于锚杆预紧力施加,支护效果更好;锚杆托板组合构件相互锁死的情况下托板的最大集中应力大于锚杆托板组合构件协调性良好的情况下的最大集中应力。
Aims at the problem that the rock bolt support plate is seriously damaged due to the uneven surface of surrounding rock in the fast tunneling of shallow buried roadway with large section and causes the support failure, the coordinated action mechanism of the bolt support plate composite component was studied by combining laboratory test, numerical simulation and theoretical analysis, and the mechanical model of the bolt support plate composite component was constructed to analyze the force evolution characteristics of the bolt support plate and the self-aligning gasket under partial load and the supporting effect of roadway under different bolt support plate combinations. The industrial test results of large section open-cut roadway of Xiaobaodang working face 112207 show that when the coordination of bolt support plate composite components is good, the stress concentration degree of bolt tail can be effectively reduced, the bolt preload can be improved, the bolt tail is not prone to damage and deformation, and it is helpful to apply the bolt preload, and the support effect is better. The maximum concentrated stress of the supporting plate under the condition of locking each other is greater than that under the condition of good coordination of the supporting plate.
作者
王照明
WANG Zhaoniing(Shaanxi Xiaobaodang Mining Co.,Ltd.,Yulin 719000,China)
出处
《煤矿安全》
CAS
北大核心
2021年第10期79-86,共8页
Safety in Coal Mines
关键词
快速掘进
浅埋大断面巷道
锚杆托板组合构件
协调作用
支护机理
fast driving
shallow buried large section roadway
rock bolt support plate composite component
coordinating role
supporting mechanism
