Abstract
In order to study the deformation of a bored pile during concrete curing, it is necessary to monitor the strain of the pile. In this paper, Brillouin optical time domain reflectometer (BOTDR) technology is used to monitor the pile strain during concrete curing, and reliable monitoring data are obtained. These data provide a basis for the study of pile deformation and pile–soil interaction during curing of bored cast-in-place piles. Compared with the traditional point strain sensor, the distributed fiber optic sensor is simple in layout and highly accurate; it can fully reflect the strain changes of the pile; the experiment also shows the advantages of distributed fiber optic sensing technology over the traditional point monitoring method.
Highlights
In the pile foundation engineering, the heat generated by the concrete curing of a bored pile is released, which obviously leads to the deformation of a bored pile
Brillouin optical time domain reflectometry can be used as Brillouin optical time domain reflectometer (BOTDR) technology; the wavelength of Brillouin scattering depends on the temperature and strain of optical fiber sensor
The distributed fiber optic sensing technology based on BOTDR is used to carry out a series of studies on the strain change of the pile in the concrete curing stage; the following conclusions are obtained: (1) The distributed optical fiber sensing technology based on BOTDR is used, and the accurate data of the pile strain are obtained to study the curing of concrete bored pile deformation; it reflects the advantage of distributed optical fiber sensing technology in the pile foundation monitoring
Summary
In the pile foundation engineering, the heat generated by the concrete curing of a bored pile is released, which obviously leads to the deformation of a bored pile. Fang et al conducted an on-site monitoring test of the dissipation process of hydration heat after pouring concrete of the pile; the temperature change and constrained stress distribution law of the concrete bored pile are obtained, and the study shows that the maximum residual stress of the pile cannot be neglected [2]. Chen et al conducted the monitoring tests on bored cast-in-place piles of an extra-large bridge, and the study preliminarily showed the distribution of strain and temperature of the pile along the depth direction caused by concrete hydration [3]. The field test experiment is carried out to monitor the strain of the pile during concrete curing; the project is a large business office building in Suzhou city, China, and the BOTDR distributed optical fiber sensing technology is used. The results will provide the references for further research on the hydration effect of the pile during concrete curing
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