Abstract: Application of distributed optical fiber temperature sensing (DTS) technology to the detection of bored pile’s integrity is still in experimental stage, in lack of theoretical basis for fiber layout and mature evaluation system for pile quality. According to the theory of radial heat conduction with internal heat source, some key procedures of detecting bored pile’s defectives by DTS were researched. With bored piles of 300mm, 400mm, 600mm, and 1000mm diameter, the heat transfer characteristics with fiber heat source built-in along the central axis of pile were studied. Furthermore, the relationship between heating power and temperature field was analyzed with excessive temperature of 1K. On this basis, the requirements for fiber layout and heating power by DTS were analyzed.

Key words: bored pile, defect detection, DTS, one-dimensional radial heat conduction, temperature field