Abstract:In order to explore the applicability of fiber grating sensing technology in the process of pipe pile penetration for sandy soil, plugging effect test of the double-walled opening model pipe pile under static pressure pile is tested in a large-scale model test chamber, using a sensitized micro-fiber grating sensor. The height of the experimental model pipe pile is 1065 mm, and the thickness is 20 mm. Moreover, the material of model tubes is aluminum and the pipe pile penetrates into the compact sand. 26 fiber Bragg grating (FBG) measuring points are arranged symmetrically along the internal and external pipes. The plugging height and strain data are collected by changing the shape of the pile shoe. The plug height, medial and lateral friction and other penetrating characteristics of the pipe pile are analyzed, and the plugging effect under static load is studied. The results show that FBG is suitable for the test of plugging effect of double-walled open pipe piles, which can accurately reflect the strain of pipe piles and penetration characteristics of the medial and lateral friction.