The invention relates to a distributed
optical fiber bridge foundation
deformation monitoring system and a construction and monitoring method, the distributed
optical fiber bridge foundation
deformation monitoring system comprises a top
optical fiber tube unit, a middle optical
fiber tube unit and a bottom optical
fiber tube unit, and a connecting optical
fiber and a free optical fiber penetrate out of the top of the top optical fiber unit and are respectively connected with a BOTDA (Brillouin Optical
Time Domain Analysis) demodulator. A bridge foundation
deformation monitoring system is pre-buried by drilling holes in the ground of a bridge foundation area,
millimeter-level-precision
pile foundation deformation
continuous monitoring is achieved through parameter changes,
geometric transformation and mechanical transformation of optical fiber signals, and data are stable and reliable; the
monitoring system in an optical fiber form is buried in a soil body, so that the
pile foundation structure can be prevented from being damaged; meanwhile, the method is suitable for a newly-built bridge and an existing bridge, supports the adjustment of the monitoring range as required in an optical fiber laying area, reduces redundant data, and effectively improves the monitoring efficiency.