论文部分内容阅读
矿山巷道、交通隧道等工程的顶板沉降变形监测是不可缺少的安全保障手段之一,现有的直线分布式光纤布设技术监测巷道沉降变形存在灵敏度较低的问题。将光纤沿巷道顶板的纵向铅垂平面布设成锯齿形状,构建相应的计算模型,给出具体的布设参数,获得了基于AV6419型号的光纤应变测试仪的监测精度和量测范围。试验结果表明,将光纤由直线式布设改变为锯齿状布设时不仅满足分布式光纤传感技术对于提取大范围测量场分布式信息能力的要求,而且通过巷道纵向分布式光纤的布设实现了监测巷道径向变形(如顶板沉降)的目的。计算模型监测的灵敏度相比于直线式有大幅度提高,为基于BOTDR技术的分布式光纤传感技术的应用与推广提供了新的方法和思路。
Mine roadway, traffic tunnels and other projects of the roof settlement deformation monitoring is an indispensable means of security, the existing straight-line distributed optical fiber distribution technology to monitor the settlement of the road there is a lower sensitivity to the problem of deformation. The optical fiber along the longitudinal vertical plane of the roof of the roadway is arranged in a zigzag shape, and a corresponding calculation model is established. Specific deployment parameters are given and the monitoring accuracy and measuring range of the optical fiber strain tester based on the AV6419 model are obtained. The experimental results show that not only the distributed optical fiber sensing technology can meet the requirements of extracting distributed information from a wide range of measurement fields when the optical fiber is changed from a straight-line layout to a zigzag layout, but also the monitoring tunnel Radial deformation (such as roof subsidence) purposes. The sensitivity of the computational model monitoring is greatly improved compared with the linear model, which provides a new method and idea for the application and popularization of the distributed optical fiber sensing technology based on the BOTDR technology.