Study on the BOTDR-based distributed detection of the pile foundation bearing capacity

The calculation of the pile foundation internal force under horizontal loads always constitutes a fundamental prerequisite to an insight into the pile deformation. Through the sensing fiber embedded in pile shaft, this paper studies the deformation of bored pile under horizontal loads, and deducts the formula of pile deflection and bending moment under horizontal loads by means of BOTDR-based distributed detection. Then through the project case, a comparison is made between the value calculated by the data obtained through the embedded fiber and the value measured by the displacement sensor. And with the analysis of the pile foundation bearing capacity under horizontal loads, the study shows that a reliable basis for pile foundation design can be achieved by the effective detection of such pile deformation as strain, deflection and bending moment, based on the BOTDR distributed fiber sensing technology.