The invention discloses a super-long
pile foundation internal force monitoring method based on FBG sensors. The specific main process of the monitoring method comprises the steps of point fixing, sensor installation, cable sleeving, demodulator reading and reading analysis. The
fiber bragg
grating (FBG) sensor is called an
FBG sensor for short, and has the characteristics of simple structure, stable performance,
narrow bandwidth, weak reflection, no need of a loop and the like, so that the
FBG sensor is widely applied to various sensors. According to the
FBG sensor-based ultra-long
pile foundation internal force monitoring method, the FBG sensor is installed on a
pile foundation reinforcement cage and permanently embedded in a concrete pile, an outgoing line and a connector sleeved with a protection
pipe are reserved,
optical fiber strain data are obtained through reading of an
optical fiber demodulator, and then the pile foundation internal force is calculated. The FBG sensor is adopted to successfully achieve long-period monitoring of the internal force of the super-long foundation pile, the
survival rate is high, stability is good, a loop does not need to be formed, the FBG sensor has wide application prospects in
foundation engineering construction, and reference can be provided for
performance monitoring of the super-long foundation pile.