光纤传感技术在边坡监测中的应用

Application of Optical Fiber Sensing Technology to Slope Monitoring

将分布式光纤传感技术引入边坡监测,既可得到整个滑坡体的概要特征,又能提高监测效率。PPP-BOTDA(Pulse-Pre-Pump Brillouin Optical Time Domain Analiysis)通过改变泵浦光的形态,在测量的脉冲光发出前,增加一段预泵浦脉冲波来激发声子以达到更高的空间分辨率和应变测量精度。本文主要介绍PPP-BOTDA的工作原理,并将其应用于野三河边坡中。同时,在边坡变形的关键部位安装北京基康BGK4420-25裂缝计,获得关键裂缝位置的应变信息,两者结合可获取边坡较完整的信息。

Applying the distributed optical fiber sensing technology into the slope monito- ring, we can get the whole outline of the landslide characteristics and improve the efficiency of the monitoring. Th＂ough the change of the pump shape, PPP--BOTDA adds a pump pulse wave to arouse phonons before pulse light is sent out to achieve higher spatial resolu- tion and strain measurement accuracy. This paper mainly introduces the work principle of PPP--BOTDA, and applies it to the Yeshanhe slope, and at the same time, it installs the BGK--4420 in the key parts of the slope deformation to get the strain of the key position, which both can obtain complete information of the slope.