Abstract
In order to examine the applicability of Fiber Bragg Grating (FBG) sensing technology in the static penetration of pipe piles, static penetration tests in clay were conducted using double-wall open and closed model pipe piles. The strain was measured using FBG sensors, and the plug height was measured using a cable displacement sensor. Using one open pile and two closed piles, the difference in pipe pile penetration was compared and analyzed. Based on FBG sensing technology and the strain data, the penetration characteristics of the pipe pile, such as axial force, lateral friction, and driving resistance were examined. Results showed that FBG sensing technology has superior testing performance for the pipe pile penetration process, can accurately reflect the strain time history of pipe piles, and can clearly reflect the penetration process of pipe piles with increasing penetration depth. In addition, the variation law of the characteristics of the jacked pile pile–soil interface was obtained. This test has significance for model tests and the engineering design of pipe piles.
Highlights
Jacked pile is widely used in China [1,2,3,4]
Chan et al [13] introduced, investigated, and developed the feasibility of fiber Bragg grating sensors for structural health monitoring. They compared the performance of the fiber Bragg grating sensor with traditional structural health monitoring systems by monitoring the strain on different parts
Monitored the deformation of PCC (Large diameter pipe pile by using cast-in-place concrete) piles based on a new quasi-distributed fiber sensing technology while the strain of PCC model piles based on Fiber Bragg Grating (FBG) sensors was monitored
Summary
Jacked pile is widely used in China [1,2,3,4]. Jacked piles are a significant component of many construction projects; improving jacked pile technology is an urgent need. Chan et al [13] introduced, investigated, and developed the feasibility of fiber Bragg grating sensors for structural health monitoring. Some scholars are adopting FBG testing technology in the jacked pipe pile field test. Li et al [20] used fiber grating sensing technology to monitor the strain field of PHC (high strength prestressed concrete) pipe piles during pile jacking. The applicability of the fiber grating sensor in monitoring the strain distribution of the pile during jacking had been demonstrated. Monitored the deformation of PCC (Large diameter pipe pile by using cast-in-place concrete) piles based on a new quasi-distributed fiber sensing technology while the strain of PCC model piles based on FBG sensors was monitored. The applicability and accuracy of FBG sensors used in the penetration test of jacked piles are explored, providing reference and scientific basis for the model test and engineering design of jacked piles
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