Foundation pile deflection measurement method based on distributed fiber sensing technique

Abstract

The invention relates to a foundation pile deflection measurement method based on a distributed fiber sensing technique. According to the foundation pile deflection measurement method based on the distributed fiber sensing technique, pile body deflection of a foundation pile can be obtained in real time, and stability of the foundation pile is monitored. The foundation pile deflection measurement method based on the distributed fiber sensing technique is characterized by comprising the following steps: (a) a group of sensing optical cables which are parallel to the axis of the foundation pipe and symmetrically arranged based on the axis serving as a center line are arranged on edges of the foundation pile; (b) by means of a Brillouin demodulation technique, compression strain and tensile strain of each section of the foundation pile under the action of horizontal load can be measured in real time; and (c) according to a formula, deflection of each section of the foundation pile can be calculated. The method is used for the pile body deflection measurement of a steel pipe pile, a reinforced concrete precast pile, a reinforced concrete bored pile and other foundation piles.

Description

technical field [0001] The invention relates to a foundation pile deflection measurement method based on distributed optical fiber sensing technology, which is mainly applicable to pile body deflection measurement of steel pipe piles, reinforced concrete prefabricated piles, reinforced concrete bored piles and other foundation piles. Background technique [0002] Foundation pile is a commonly used foundation treatment method in engineering construction. It not only bears vertical loads, but also often bears horizontal loads, such as support piles in foundation pit engineering, foundation piles under retaining walls, foundation piles under towering structures, port Foundation piles of wharf projects, foundation piles under wind power towers, foundation piles under offshore platforms, etc. In engineering design, it is generally necessary to measure the horizontal displacement of the pile top through a horizontal static load test, determine the horizontal bearing capacity of th...

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Problems solved by technology

The distributed optical fiber sensing technology based on Brillouin scattering has outstanding advantages such as good durability, no zero drift, uncharged work, anti-electromagnetic interference, and large transmission bandwidth. It can realize continuous distribution of the parameters to be measured. , water conservancy, electric power, transportation, petrochemical, marine and other fields, but the method and system for measuring foundation pile deflection based on distributed optical fiber sensing technology has not yet been seen.

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