摘要
针对潞宁煤业22116运输巷围岩稳定性及回采巷道超前支护长度确定等问题,采用锚杆测力计及断面收敛测试系统对22116运输巷进行现场实测.实测结果显示:锚杆轴力受工作面推进影响较为明显,且锚杆轴力突变与周期来压同步性较强,上覆岩层断裂对巷道锚杆、锚索等支护结构影响明显;锚杆轴力变化与围岩变形有较好的同步性,距工作面越近,巷道变形量较大,锚杆轴力越大;当锚杆轴力与围岩变形同步性较差时,说明锚杆发生锚固损伤,需及时采取补强支护措施;上下两巷围岩稳定性受工作面周期来压影响明显,且工作面超前支承压力影响范围在60 m以上,超前支护长度应不少于60 m.
In view of the stability of the surrounding rock of Luning Coal Industry 22116 roadway and the determination of the advance support length of the mining roadway,the bolt dynamometer and the cross-section convergence test system are used to conduct field measurements on the 22116 roadway.The actual measurement results show that the bolt axial force is significantly affected by the advancement of the working face,and the sudden change of the bolt axial force and the synchronism of periodic pressure are strong,and the overburden fracture has obvious influence on the supporting structure of the roadway bolt and anchor cable.The change of the bolt axial force has good synchronization with the surrounding rock deformation.The closer to the working face,the greater the deformation of the roadway and the greater the bolt axial force;when the bolt axial force is in poor synchronization with the surrounding rock deformation,it indicates anchor bolts are damaged,and reinforcement and support measures need to be taken in time;the stability of the surrounding rock of the upper and lower lanes is significantly affected by the periodic pressure of the working face,and the influence range of the leading support pressure of the working face is more than 60 m,and the length of the leading support should be quite long at 60 m.
作者
苗晓伟
张志强
Miao Xiaowei;Zhang Zhiqiang(Luning Coal Industry Co.,Ltd.,Xinzhou 036700,China)
出处
《矿业工程研究》
2020年第3期8-13,共6页
Mineral Engineering Research
关键词
围岩变形
现场实测
周期来压
锚杆受力监测
surrounding rock deformation
roadway deformation
periodic weighting
bolt force monitoring
