Test method for internal force of phc pile body based on optical fiber strain and optical fiber layout method

Abstract

The invention discloses a PHC pile internal force testing method based on optical fiber strain and an optical fiber laying method, including a preparation stage and a pre-buried piling stage: laying distributed optical fiber sensors on the PHC pile, and driving the PHC pile into the corresponding In the preset location; the measurement stage: use the optical fiber strain analyzer to test the loading and unloading of the PHC pile; the internal force calculation stage: calculate the axial force of the pile body and the pile body through the obtained axial compressive strain data of the optical fiber Side friction resistance and pile body bending moment; and test result data analysis: analyze the data of the pile body axial force, pile body side friction resistance and pile body bending moment of each described PHC pile respectively, determine pile body axial force and The distribution of pile side frictional resistance with depth, and the change law of pile tip resistance, pile side frictional resistance and pile body bending moment with pile top load; the test process of this test method is clear and orderly, the fiber optic layout is reasonable, and the obtained data is correct High, can provide reliable data and theoretical basis for site construction.

Description

technical field [0001] The invention relates to the field of pile foundation construction detection and testing, in particular to a PHC pile body internal force testing method based on optical fiber strain and an optical fiber laying method. 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. In recent years, PHC pipe piles (that is, prestressed high-strength concrete pipe piles) have been widely used in high-rise buildings, roads, bridges, ports, wharves and other projects due to their excellent bearing capacity, low cost, and fast production and construction speed. a wide range of applications. As the transmission medium between the superstructure load and the underlying foundation, the safety and applicability of foundation piles are self-evident for the importance of the entire project, and the detection of pile body stress and s...

AI Technical Summary

Problems solved by technology

[0003] For example, the Chinese invention patent application (publication number: CN102936903A) disclosed a method for PHC pipe pile test pile stress and strain detection in 2013, which has the functions of setting out, grooving, connecting, setting out, testing, fixing wires, and glue distribution. , detection and other steps; this detection method can be used for simple pipe pile stress and strain tests, but its measurement accuracy and effectiveness are not high; the main reason is that its optical fiber layout is not reasonable enough, and the optical fiber protection is not enough, the optical fiber is easy to damage and fluctuate

[0004] Moreover, with the rapid development of high-rise buildings, the depth of pipe piles is getting deeper and deeper, and multi-section pipe piles are required for docking in longer pile holes. For the docking of multi-section pipe piles, the layout of optical fibers is also very important. damage

[0005] In addition, in the existing test methods, there is a lack of standardized data testing process and data analysis methods, and the detected stress and strain values ​​cannot well reflect the stress and bearing performance of the pipe pile, which is not accurate and effective for subsequent construction. Guidance, practical reference is of limited significance

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