高应力软岩巷道全长锚固玻璃钢锚杆受力特征研究  

Mechanical characteristics analysis of fully grouted GFRP rock bolts in highly stressed soft rock tunnels

作　　者：王文杰[1,2] 万浩 WANG Wenjie;WAN Hao(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan,Hubei 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan,Hubei 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验,湖北武汉430081

出　　处：《采矿与安全工程学报》2019年第3期482-490,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51574183,50804036);湖北省自然科学基金项目(2014CFB814)

摘　　要：针对高应力软岩巷道全长锚固玻璃钢锚杆受力特征及失效问题,采用FLAC^3D软件对软岩巷道中同断面不同安装部位玻璃钢锚杆轴向和横向受力特征及其随支护时间的变化规律进行分析。结果表明:软岩巷道顶板和两帮处锚杆主要受轴向拉伸作用,而拱肩和底角处锚杆受到轴向拉伸和横向弯曲的综合作用。随着支护时间的增长,顶板和两帮处锚杆轴力增大明显,但锚杆弯矩较小;而拱肩和底角处锚杆除轴力增大外,其弯矩变化也较大,锚杆弯矩呈现先增大后减小的规律,且弯矩较大的部分主要集中在靠近临空面的外端部,易使锚杆受到横向弯曲的影响而发生弯拉失效。研究结果与现有文献理论研究及现场试验结果相吻合,能为高应力软岩巷道中玻璃钢锚杆及其他黏结式锚杆支护设计和参数优化提供理论指导。In view of the mechanical characteristics and invalidation problems of fully grouted GFRP rock bolts in highly stressed soft rock tunnel, the FLAC^3D software is used to analyze the axial and transverse force characteristics of GFRP rock bolts in different parts of the same section in soft rock tunnel and their change rules with support time. It has been found that bolts at the arch and two sides of soft rock tunnel are mainly subjected to the axial tension, while bolts at the spandrel and arch angle are subjected to the combined action of axial tension and transverse bending. With the increase of support time, the axial force of rock bolts at the arch and two sides of the tunnel increases obviously, but the bending moment is small. However, as to the rock bolts at the spandrel and arch angle, not only the axial force increases but also the bending moment changes a lot. The bending moment increases firstly to the maximum and then decreases, and the large bending moment is mainly concentrated on the outer end near the free face, which causes the bolts easily affected by the lateral bending and leads to the bending failure. The research results are consistent with the existing theoretical research and field test data, which can provide theoretical guidance for the design and parameter optimization of GFRP rock bolts and other bonded bolts support in highly stressed soft rock tunnel.

关 键 词：高应力软岩 巷道支护 玻璃钢锚杆 全长锚固 受力特征 

分 类 号：TD35[矿业工程—矿井建设]