Application of a FBG-Based Instrumented Rock Bolt in a TBM-Excavated Coal Mine Roadway
Application of a FBG-Based Instrumented Rock Bolt in a TBM-Excavated Coal Mine Roadway
复制标题
基于FBG的仪表化锚杆在TBM掘进煤矿巷道中的应用
DOI：
10.1155/2018/8191837
复制
发表时间：
2018-01-01
影响因子：
1.9
通讯作者：
Lin, Jian
中科院分区：
文献类型：
--
作者：
Tang, Bin;Cheng, Hua;Lin, Jian
在煤矿井下巷道掘进过程中，锚杆支护被广泛应用，以防止巷道塌方，提高巷道围岩的稳定性。煤矿巷道锚杆的超载和失效会导致事故或人员伤亡。因此，监测锚杆轴力和工作状态对保证煤矿井下安全生产起着越来越重要的作用。传统的机械或电子锚杆监测系统通常受到电磁干扰、腐蚀性地下水和地下工作场所灰尘环境的影响。本文提出了一种基于光纤光栅的岩石锚杆。将准分布式光纤光栅传感器安装在开槽锚杆上，用环氧树脂封装，将光纤光栅传感器固定在锚杆上，保护光纤光栅传感器不受损伤。在现场应用之前，对FBG传感器进行了校准。监测结果表明，巷道顶板锚杆轴力较大，最大轴力集中在锚杆中部附近。将锚杆监测仪与煤矿现有监测系统集成，建立了一套实时、准确的锚杆监测系统。
Rock bolts have been widely applied with roadway excavation in underground coal mines to prevent roadway collapse and improve the stability of roadway surrounding rocks. Overloading and failures of rock bolts could result in accidents or casualties in coal mine roadways. Consequently, monitoring axial forces and work conditions of rock bolts plays an increasingly important role in ensuring safe operations of underground coal mines. Conventional mechanical or electronic rock bolt monitoring systems are typically affected by electromagnetic interference, corrosive groundwater, and dusty circumstance in underground working sites. This work proposed a FBG-based instrumented rock bolt. Quasi-distributed FBG sensors were installed on a slotted rock bolt and encapsulated by epoxy resin that was used to fix FBG sensors on the rock bolt and protect FBG sensors from damage. The FBG sensors were calibrated before the in situ application. Monitoring results indicated that the axial forces of rock bolts installed on the roof of the roadway were higher than that of others, and the maximum axial forces of each rock bolt were typically detected near the middle portion of rock bolts. A real-time and accurate rock bolt monitoring system was established by integrating instrumented rock bolts to the existing monitoring system of the coal mine.