Foundation pit slide surface position monitoring method based on FBG (fiber bragg grating)

The invention discloses a foundation pit slide surface position monitoring method based on FBG (fiber bragg grating). The foundation pit slide surface position monitoring method comprises the following steps of arranging an U-shaped FGB string on an inclinometer tube, arranging the inclinometer tube in a drilling hole which is formed in a to-be-monitored slide surface, adopting a FBG demodulation instrument to monitor the change of the FGB on the inclinometer tube in real time, calculating the average strain of each cross section of the inclinometer tube, judging the position of the foundation pit slide surface according to the change of the strain value, and the like. The foundation pit slide surface position monitoring method has the advantages that the operation is convenient and rapid, the safety and reliability are realized, and the monitoring method is suitable for performing real-time and long-time monitoring on the foundation pit slide surface.