针对目前常规测斜仪的不足，利用光纤Bragg光栅传感技术的优点，开发了一种监测岩土边坡内部变形的新型光纤光栅测斜仪，并成功地应用于高速公路膨胀土边坡的变形监测中。现场监测边坡的数据表明，该光纤光栅测斜仪监测的数据与传统的测斜仪监测的数据比较吻合，证实了光纤光栅测斜仪的可靠性；现场监测结果还发现边坡最大变形出现在第二台阶，其最大变形为61 mm，第一台阶边坡的变形较小，其变形大约为13 mm，这也证明在坡脚设置挡土墙能够很大地改善边坡的稳定性。该光纤光栅测斜仪可以和其他光纤光栅传感器共同组成的监控网络对岩土边坡进行变形监测，通过该监测网络可以实现对岩土体边坡的远程实时在线监测和安全预警。%Considering the deficiency of inclinometer and the advantage of the fiber Bragg grating sensing technology,the fiber Bragg grating inclinometer that can monitor the internal deformation of geotechnical slope was developed in the paper. Meanwhile a new type inclinometer was used successfully on the de-formation monitoring of expansive soil slope of highway. In-site monitoring data show that the monitoring data of fiber Bragg grating inclinometer coincide with those of the conventional inclinometer,and the relia-bility of fiber Bragg grating inclinometer was proved. Meanwhile it is found that the maximum deformation of slope appears on the second section of slope and the deformation is 61 mm,and the deformation of the first section of slope is much smaller,namely,about 13 mm. And it is proved that setting slope retaining wall in the slope foot can dramatically improve the stability of slope. A monitoring network system can be formed with the fiber Bragg grating inclinometer and other fiber Bragg grating sensor which can also be used in deformation monitoring of geotechnical slope. With the network signal transmission,the long-tern real-time online monitoring,early safety warning on internal deformation of geotechnical slope can be a-chieved.
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