Optical fibre-based sensors have found a variety of applications throughout engineering and science in the measurement of strain and temperature. Current commercially available sensing technologies are able to provide strain measurements in the order of microstrain across tens of kilometres of range. The strong demand for reliable sensing tools in engineering geology allowed for the advancement of the optical fibre technology which has settled in this field during the past decade. Among the variety of sensing approaches, interferometric fibre optic sensors have rarely been tested for detection of ground movement. In this work we present the results of six laboratory scale experiments in which simulated rainfall induced shallow landslide model made up of non-cohesive soil is equipped with a newly developed coherent fibre optic sensor. Results indicate that a phase of early precursors of instability could be identified by the sensors in all six experiments, two to eight minutes before slope failure. The sensing system proved to be reliable in detecting the evolution of slope stability at shallow depths of up to a few meters depending on the sensors' burial depth, hence stating the emergence of a simple and cost-effective approach for detailed strain monitoring. The proposed sensing technique could therefore provide a viable and cheaper alternative to commercially available optical fibre interrogators and furnish quantitative monitoring data for shallow landslide monitoring in soil-like materials. In order to be efficient for the detection of such failures with a significant precursory window, sensors should ideally be placed in the vicinity of a sliding surface or landslide boundary, which is an achievable task given the high sensing range and multiplexing capabilities of optical fibre sensors.

基于光纤的传感器在应变和温度的测量中已在整个工程和科学领域中得到了广泛的应用。当前的市售传感技术能够在数十公里的范围内提供微应变量级的应变测量。对工程地质领域中可靠的传感工具的强烈需求，使过去十年在此领域中稳定下来的光纤技术得到了发展。在各种传感方法中，很少对干涉式光纤传感器进行地面运动检测的测试。在这项工作中，我们介绍了六个实验室规模的实验的结果，其中由非粘性土壤组成的模拟降雨诱发的浅层滑坡模型配备了新开发的相干光纤传感器。结果表明，在所有六个实验中，在斜坡破坏发生前两到八分钟，可以通过传感器识别出早期不稳定性的早期阶段。事实证明，该传感系统可根据传感器的埋藏深度可靠地检测出最浅几米深的边坡稳定性的变化，从而表明了一种简单且经济高效的方法来进行详细的应变监测。因此，所提出的传感技术可以为市售的光纤询问器提供一种可行且更便宜的替代方案，并提供定量监测数据，以对类土壤材料中的浅层滑坡进行监测。为了有效地利用明显的先验窗口来检测此类故障，