Abstract: The principle of bored pile detection based on distributed optical fiber sensing technology is introduced in this paper and model test is carried out. Mud-intercalated bored piles with different clay contents (0, 33.3%, 50%, 66.7%, 100%) are prepared, and the optical fiber temperature rise in these piles are measured to analyzethe rule of the temperature rise as well as the influences of heating power and clay content on optical fiber temperature rise. The results reveal a good linear relationship between heating power and optical fiber temperature rise. The temperature rise increases slowly firstly and then rapidly with the increment of clay content. It is also closely related with the structure and heat conductivity coefficient of pile medium. The model test in this paper verifies the feasibility of distributed optical fiber sensing technology in the detection of bored pile foundation.

Key words: optical fiber sensing technology, pile foundation detection, mud-intercalated pile, temperature rise, bored pile