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。

Nowadays the deformation monitoring of roof subsidence of mine roadway, tunnel, etc., is one of the indispensable means for engineering security. The existing linear distributed fiber optic monitoring technology is low sensitivity. Based on the distributed optical fiber sensing technology, further research is made on the form of the layout of the fiber. We put the fiber along the longitudinal vertical plane layout of roadway roof into sawtooth shape, build the corresponding calculation model, give the layout parameters and obtain the monitoring accuracy and the measurement range(AV6419). The test results show that when we change the linear layout into sawtooth layout it can not only meet the requirements of large-scale field measurement of distributed information capabilities of distributed optical fiber sensing technology, but also realize the purpose of monitoring the radial deformation of the roadway (such as roof settlement) through the arrangement of axially distributed optical fiber in roadway. Besides, this model’s sensitivity will have a substantial increase, so as to provide a new method and ideas for application and promotion of distributed optical fiber sensing technology based on BOTDR.