Method for monitoring compression and tensile deformation of stressed rod piece based on optical fiber sensing technology

Abstract

The invention discloses a method for monitoring compression and tensile deformation of a stressed rod piece based on an optical fiber sensing technology. The method comprises the following steps thatdifferent sensing optical cables, namely quasi-distributed steel bar stress sensing optical cables or quasi-distributed fiber bragg grating strain sensing optical cables, are selected for installationaccording to the type of the supporting rod piece in a to-be-detected area in a foundation pit support structure, and the sensing optical cables are connected with an FBG demodulator; the FBG demodulator sends out a broadband optical signal, transmits the broadband optical signal to the sensing optical cable and reflects a group of narrow-band light with different wavelengths; when the sensing optical cable changes along with the supporting rod piece, the resonance wavelength of the sensing optical cable drifts, the wavelength of reflected narrow-band light is recognized through the FBG demodulator, the wavelength change of the narrow-band light is monitored, and whether the supporting rod piece is subjected to tensile deformation or compressive deformation is judged. Compared with a traditional point type monitoring method, the method has the advantages that quasi-distributed monitoring is achieved through the optical fiber sensing technology, and the measurement convenience, sensitivity and precision are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of automatic monitoring, and in particular relates to a method for monitoring compression and tensile deformation of stressed rods based on optical fiber sensing technology. Background technique [0002] In the current foundation pit construction, the collapse caused by the instability of the foundation pit slope may cause major safety risks or accidents in the foundation pit and surrounding building facilities. At present, in the monitoring of the foundation pit construction process, manual on-site measurement is mostly used, and the construction site is monitored through instruments such as full rotation instruments, levels, and reading instruments. This method often takes a lot of time for technicians, resulting in the inability to quickly obtain data. , using manual monitoring, which often has a small monitoring coverage density, cannot meet the requirements of early warning, and cannot guarantee the per...

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Problems solved by technology

[0002]In the current foundation pit construction, the collapse caused by the instability of the foundation pit slope may cause major safety risks or accidents in the foundation pit and surrounding building facilities

At present, in the monitoring of the foundation pit construction process, manual on-site measurement is mostly used, and the construction site is monitored t

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