Abstract
The rigid-drainage pile, designed to accelerate the dissipation of excess pore water pressure around the pile, is a new type of pile that combines the bearing capacity of ordinary rigid piles and the draining capacity of gravel piles. Field tests of these new piles were performed for the first time at a construction site in the new campus of Jiangyin No. 1 High School. Numerous parameters were observed for the test piles in many trials, including the excess pore water pressures, horizontal soil pressures, and displacements. At the measuring position at 0.6 m from the pile center, the rigid-drainage pile dissipates 70% of the peak excess pore water pressure in 1000 s, whereas the ordinary pile requires nearly 4000 s to dissipate the identical amplitude. The field test results clearly demonstrate that the rigid-drainage pile can reduce the amplitude of the peak pressure caused by piling in the liquefiable layer, quickly dissipate the excess pore water pressure, reduce the loss of effective stress in the soil surrounding the pile, and maintain the foundation stability.
Highlights
Providing bearing capacity and ground treatment are two main functions of pile foundation
In order to ensure the safety of the superstructure, it is necessary for the pile foundation to provide sufficient bearing capacity
Ground treatment mainly deals with soft soil by rapid drainage and accelerating soil consolidation and includes the treatment of liquefiable soil layer [1,2,3]. e influence of soil liquefaction on pile foundation during an earthquake has two aspects: the destruction of the pile body makes it lose the bearing capacity for superstructure [4] and the liquefaction of site causes the whole building to incline and sink [5]
Summary
Providing bearing capacity and ground treatment are two main functions of pile foundation. If the effectiveness of the drainage channel on the pile body can be confirmed by the field piling test, it indicates that rigid-drainage pile can inhibit the accumulation of the excess pore water pressure in the soil within a certain range and accelerate its dissipation. En, in the event of an earthquake, the excess pore water pressure generated in the liquefiable soil layer can be dissipated, and the pore water around the rigid-drainage pile can be discharged so as to maintain the partial bearing capacity of the pile foundation and avoid the occurrence of large liquefaction of the site. In this field test, the rigiddrainage pile had a precast reinforced concrete square pile for the bearing capacity and a plastic sheet as the drainage material.
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