Abstract
In order to study the penetration mechanism of jacked piles in viscous soil foundation, the stress variation law of the pile–soil interface was obtained by installing silicon piezoresistive earth pressure and pore water pressure sensors, and fiber Bragg grating (FBG) sensors in a model pile body, and the penetration characteristics of jacked piles in homogeneous viscous soil were defined. The test results show that: Fiber Bragg grating and silicon piezoresistive sensing technology can better meet the requirements of testing the characteristics of jacked pile in viscous soil. The ratio of pile lateral resistance to pile end resistance varies when pile is jacked in homogeneous viscous soil. In the early stage of pile jacking, the ratio of pile lateral resistance is small, and in the later stage of pile jacking, the ratio of pile lateral resistance increases, but the ratio of pile end resistance is still higher than that of pile lateral resistance. The ratio of the effective stress to the total radial stress is high, and the variation law of the two is consistent with the depth. The total radial stress, pore water pressure, and effective radial stress all exhibit the degradation phenomenon, and the degradation degree decreases gradually with the increase in penetration depth at the same depth. The ratio of excess pore water pressure to overburden weight decreases with the increase in depth, and the maximum value is 87%. The research results can provide a reference for the engineering practice of jacked pile in viscous soil foundation.
Highlights
With the continuous development of urban construction and the gradual improvement in jacked pile technology, jacked pile is more widely used in soft soil areas and densely populated cities [1,2,3,4]
Oh et al [14] implanted a quasi-distributed optical fiber sensor in the pipe pile grooves to separate the side friction resistance and pile end resistance of the jacked pile penetration process to study the timeliness of the bearing capacity
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Summary
With the continuous development of urban construction and the gradual improvement in jacked pile technology, jacked pile is more widely used in soft soil areas and densely populated cities [1,2,3,4]. McCabe et al [20] buried earth and pore water pressure sensors in the soil around the pile and presented a case history describing the measurements collected during the installation and load testing of groups of five, closely spaced, precast, concrete piles in a soft clay-silt. The earth and pore water pressures at the pile–soil interface act directly on the pile body, which is more influential than when further from the pile This kind of test has been reported in the literature few times [21], which limits the in-depth study of the pile–soil interface characteristics and bearing capacity mechanism. The penetration mechanism of jacked pile in viscous soil foundation was studied by using silicon piezoresistive pressure sensors and FBG fiber Bragg grating sensors, and a special nylon rod model pile. It is of practical significance to guide the design of jacked pile engineering
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