Fig. 1. Schematic of inclinometer tube

Fig. 2. Force analysis of bending deformation of inclinometer tube

Fig. 3. Calculation diagram of inclinometer tube

Fig. 4. Optical fiber layout on the inclinometer tube

Fig. 5. Photo of displacement measurement experiment site

Fig. 6. Schematic of the boundary conditions of the displacement measurement experiment

Fig. 7. Comparison of displacement measured by optical fiber and dial gauge displacement

Fig. 8. The location of the test foundation pit and its surrounding environment

Fig. 9. Steel strand strain optical cable

Fig. 10. Fiber-optic inclinometer sensors arranged in the ground connecting wall steel cage and the soil

Fig. 11. Fiber optic inclinometer point after installation

Fig. 12. Photo of foundation pit excavation site

Fig. 13. Denoising results of DBSCAN algorithm

Fig. 14. Comparison of initial strain and displacement of CX2 measuring point on October 13

Fig. 15. Comparison of initial strain displacement of TX4 measuring point on October 15

Fig. 16. Comparison of fiber displacement of CX2 measuring point and displacement of inclinometer and displacement error

Fig. 17. Comparison of fiber displacement of TX4 measuring point and displacement of inclinometer and displacement error