Landslide internal displacement monitoring method based on fiber grating

Abstract

The invention discloses a landslide internal displacement monitoring method based on a fiber grating. The monitored landslide internal deformation through combination of the fiber grating sensing technology and the conventional inclinometer causes bending deformation of an inclinometer pipe and then causes deformation of the fiber grating. The corresponding strain value can be accurately obtainedthrough the wavelength change of the fiber grating in real time by the fiber grating sensor and the fiber grating demodulator, then the displacement of the corresponding measuring point is calculatedthrough a strain-displacement differential calculation method and then the disturbance of the inclinometer pipe is accurately calculated. Implementation in onsite side slope monitoring is convenient,and the monitoring data are processed through the simple complex Simpson integration formula so that the deformation situation in the side slope can be accurately acquired. The method is simple in operation and easy to implement and can perform long-term real-time monitoring of the side slope so that the data processing method is simple and accurate and popularization practicality is high.

Description

technical field [0001] The invention relates to a landslide monitoring method, in particular to a method for monitoring internal displacement of a landslide based on an optical fiber grating. Background technique [0002] In the safety and stability monitoring of landslides, long-term monitoring of surface displacement and internal displacement of landslides is generally required. In the current monitoring methods, equipment such as levels, total stations, and inclinometers are mostly used for manual monitoring, but the timeliness of data and the convenience of measurement are difficult to meet the complex terrain, poor safety of manual operation, and real-time monitoring. slope requirements. In recent years, fiber grating sensor, as a new type of sensing device, has the characteristics of anti-electromagnetic interference, safety and reliability, corrosion resistance, high stability, and real-time measurement, and has been widely used in the field of engineering monitoring...

AI Technical Summary

Problems solved by technology

However, this method cannot measure the real-time deformation at different depths of the foundation pit, and can only determine the approximate position of the slip surface, which reflects the limitations of this method

[0007] At present, there are many in-situ inclinometer sensors based on the principle of fiber grating monitoring, and there are not a few sensors used for internal deformation monitoring of landslides. Most of the improvements are mainly reflected in the calibration and processing of data, and there are also various problems: the accuracy is not high , many assumptions, etc.

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