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提出了一种基于分布式光纤光栅的边坡监测与报警系统。根据强度折减法,利用ANSYS软件分析出边坡的软弱面及滑体所在的具体位置,从而在该处安装经过特殊封装的拉线式光纤光栅位移传感器。滑体的位移通过拉线转换为作用在光栅上的应力,而光纤光栅反射波长与应变具有良好的线性关系,因此通过检测光栅反射光的中心波长的偏移量,就可以解调出滑体的位移信息,从而获得滑坡的健康状况和破坏程度,实现对边坡的实时监测。实验结果与理论相符合,在-20～80℃范围内测量精度可达到±0.02mm/200mm,表明本系统能够满足边坡监测的要求。
A slope monitoring and alarming system based on distributed optical fiber grating is proposed. According to the strength reduction method, the soft spot of the slope and the specific location of the slide body are analyzed by the ANSYS software, so that the specially packaged pull-line fiber grating displacement sensor is installed there. The displacement of the sliding body is converted into the stress acting on the grating by the pulling wire. The reflection wavelength and the strain of the FBG have a good linear relationship. Therefore, by detecting the shift of the center wavelength of the reflected light from the grating, Displacement information, in order to get the health status of the landslide and the extent of damage to achieve real-time monitoring of the slope. The experimental results are consistent with the theory. The measurement accuracy can reach ± 0.02mm / 200mm in the range of -20 ~ 80 ℃, which shows that the system can meet the requirements of slope monitoring.