Abstract
In order to investigate the influence of different diameters on pile end resistance, pile side resistance, pile axial force and pile force transmission law of jacked pile penetration, two pairs of embedded sensitized microfiber grating sensors were installed by slotting the pile body. The pile-jacking process of static-pressing viscous foundation soil with different diameters of closed-tube model piles was successfully monitored. The test results show that the pile pressure, pile end resistance and pile side resistance of the two test piles increase linearly with the increase of pile depth. When the pile jacks, the final pressure of the test pile TP1 is higher than that of the test pile. TP2 is 31% higher, pile end resistance is 18% higher, and total side resistance is 57% higher. The results show that increasing the pile diameter can significantly increase the pile side resistance; under different penetration depths, the pile side resistance is from top to end. Continuously exerted, the axial force of the pile body decreases with the depth of the pile and the slope of the distribution curve of the axial forcegradually decreases. At the maximum penetration depth, the axial force of the pile TP1 is 18% larger than that of the test pile TP2; As the depth increases, the unit side resistance at the same penetration depth gradually decreases, that is, the side resistance has a “degradation effect”; at the end of the pile jacking, the percentage of the pile end resistance to the pile force exceeds 50%, that is, the pile end resistance bears most of the load. This research can be used as a reference for the study of pile driving mechanism in clayey and layered clayey soils.
Highlights
Many scholars at home and abroad have conducted field tests [1,2,3] and indoor tests [4,5,6,7], combined with numerical simulation, to study the force state of the pile body in the process of pile jacking
In order to study the influence of different diameters on the pile side resistance, In this sample, the FBG sensor is pasted on the surface of the pile and the wavelength difference of the optical fiber measured by the FS2200RM fiber grating demodulator during the pile jacking process
It can be found that the final pressure of the test pile TP1 is 31% higher than that of the test pile TP2, indicating that the pile diameter has a greater influence on the final pressure
Summary
Many scholars at home and abroad have conducted field tests [1,2,3] and indoor tests [4,5,6,7], combined with numerical simulation, to study the force state of the pile body in the process of pile jacking. Doherty et al [1] carried out field tests of open pile and studied the stress during pile jacking. Zhang et al [2] studied the main influence and effect of soil clogging through field tests, and studied the change rule of pile end resistance. Paik [4] studied the influence of soil plugs on the bearing capacity of open-ended pipe piles, and quantified it with an incremental filling rate. Combined with indoor model pile tests, they proposed an empirical relationship for the bearing capacity of open-end piles. 5 After scrubbing the FC connector of the FBG sensor with alcohol and cotton balls, connect it to the FS2200RM fiber grating demodulator to detect its survival rate. Epoxy resin is used to encapsulate the surface of the pile so that the surface is flush with the pile body
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