PHC pile body internal force testing method based on optical fiber strain and optical fiber laying method

Abstract

The invention discloses a PHC pile body internal force testing method based on optical fiber strain and an optical fiber laying method. The PHC pile body internal force testing method comprises the steps of a preparation stage; a pre-burying and piling stage, wherein distributed optical fiber sensors are laid on PHC piles, and the PHC piles are driven into corresponding preset places; a measurement stage, wherein testing of loading and unloading of the PHC piles is performed by using an optical fiber strain analyzer; an internal force calculation stage, wherein pile body axial force, pile bodyside friction and pile body bending moment are calculated correspondingly through the obtained axial compression strain data of the optical fiber; and detection result data analysis, wherein the dataof the pile body axial force, the pile body side friction and the pile body bending moment of each PHC pile are analyzed correspondingly, and the distribution of the pile body axial force and the pile body side friction along with the depth and the change rules of the pile end resistance, the pile body side friction and the pile body bending moment along with the pile top load are determined. According to the testing method, the testing process is clear and ordered, the optical fiber arrangement is reasonable, the correctness of the obtained data is high, and the reliable data and theoreticalbasis can be provided 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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