摘要
针对金山店铁矿中深孔爆破回采时产生的爆破应力波的幅度较大,频率较高,不利于玻璃钢锚杆巷道支护稳定性的问题,采用FLAC3D动力分析模块与结构单元的可选模块Cable相耦合,分别研究了单次和多次爆破荷载作用下玻璃钢锚杆的动态响应特征,结果表明:安装角越大,锚杆轴向应力越大,安装角越小,锚杆轴向应力越小;玻璃钢锚杆的轴向应力主要集中在锚杆锚固段的前端,随着锚固深度的增大,轴向应力迅速衰减并趋于零;在多次爆破荷载作用下玻璃钢锚杆会产生一定的累积损伤,随着爆破荷载次数的增加锚杆轴力缓慢叠加增大。
The dynamic response characteristics of GFRP bolts under single and multiple blasting load is studied using the coupled dynamic analysis module of FLAC3D and the cable optional module of structural unit to address the problem of high amplitude and great frequency of stress wave generated during the extraction of ore by the medium-deep hole blasting in Jinshandian Iron Mine, which is unfavorable for the stability of roadway supported by GFRP bolts. The results show that the bigger installation angle of bolts is,the bigger axial stress is and the smaller installation angle of bolts is, the smaller axial stress is. The axial stress is mainly concentrated in the front section of bonded segment of GFRP bolts and with greater anchoring depth , the axial stress rapidly decays to zero. GFRP bolts would generate cumulative damage effect un- der multiple effects of blasting toad and the axial force of bolts would slowly increase by superimposition with higher frequency of blasting load.
出处
《化工矿物与加工》
CAS
北大核心
2016年第9期54-57,共4页
Industrial Minerals & Processing
基金
湖北省自然科学基金资助项目(2014CFB814)
关键词
玻璃钢锚杆
爆破动载
动态响应
数值分析
GFRP bolt
blasting dynamic load
dynamic re- sponse
numerical analysis
