Development of new drain method for protection of existing pile foundations from liquefaction effects

Harada, Naoyuki; Towhata, Ikuo; Takatsu, Tadashi; Tsunoda, Shinsuke; Sesov, Vlatko

doi:10.1016/j.soildyn.2005.02.019

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…One of them is the liquefaction problem of pile foundation of elevated railways and flyovers (Figure 15.40). Harada et al (2004Harada et al ( , 2006 developed metal pipe drains which can be installed in loose sand by mechanical blows. Since the size of a required blow machine is limited, it is possible to execute it under elevated structures.…”

Section: Dissipation Of Excess Pore Water Pressurementioning

confidence: 99%

Earthquake Geotechnical Engineering

Bojorque

Roeck

Maertens

2007

Geotechnical, Geological and Earthquake Engineering

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Section: Dissipation Of Excess Pore Water Pressurementioning

confidence: 99%

Earthquake Geotechnical Engineering

Bojorque

Roeck

Maertens

2007

Geotechnical, Geological and Earthquake Engineering

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“…Ohbayashi et al [12] analyzed a lot of foundation property data on an earthquake site and concluded that a sand compaction pile could improve the liquefaction resistance of the foundation. Harada et al [13] proposed a layer ring structure for a steel pipe pile that is composed of multilayer rings. During an earthquake, the excess pore water can enter the drainage device through the gap between the rings and thus be drained out of the soil.…”

Section: Introductionmentioning

confidence: 99%

Performance of a Subgrade-Embankment-Seawall System Reinforced by Drainage PCC Piles and Ordinary Piles Subjected to Lateral Spreading

Chen

Wang

et al. 2023

Geofluids

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Coral sand is widely distributed in coastal areas and used as a soil foundation in an increasing number of projects. Historical records show that the liquefaction and lateral spreading of coral sand foundations occurred many times during earthquakes, resulting in serious geological and engineering disasters. Based on a rigid drainage pile, a PCC pile (Large Diameter Pipe Pile by using Cast-in-place Concrete) and drainage body are innovatively combined into a new drainage PCC pile, to reduce the harm caused by liquefaction and lateral spreading of the coral sand foundation. In this study, the seismic response of the subgrade-embankment-seawall system on the coral sand liquefaction site was simulated using a shaking table. The excess pore water pressure ratio, acceleration, average foundation settlement, seawall displacement, embankment deformation, and pile body bending moment of the ordinary pile foundation and new drainage PCC pile foundation under seismic loads of PGA peak ground acceleration = 0.05 g , PGA = 0.1 g , and PGA = 0.2 g on the coral sand site were analyzed and compared. Compared with ordinary pile foundations, the excess pore water pressure ratio, pile bending moment, seawall displacement, foundation settlement, and embankment deformation of the new drainage PCC pile foundation were markedly reduced, while acceleration increased, which showed that the new drainage PCC pile had a positive anti-liquefaction effect on the coral sand foundation.

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“…Further recent developments have considered the range of drainage from the improvement in densification of silty sands with drained piles [18], the mitigation of liquefaction below embankments using plastic board PVDs [43], the direct in situ evaluation of the cyclic response of PVD-improved ground [44], and centrifuge testing [45]. When installed with deep foundations, drains have been shown to reduce the magnitude of excess pore pressure as well as the shaking-induced bending moments [46]. This paper demonstrates the performance of a new drained pile that combines the provision of vertical drains along the longitudinal axis of pre-cast piles.…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Drained Piles in Layered Soils

Yang,

Xin,

Chen

et al. 2023

Materials

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The provision of drains to geotechnical elements subjected to strong ground motion can reduce the magnitude of shaking-induced excess pore pressure and the corresponding loss of soil stiffness and strength. A series of shaking table tests were conducted within layered soil models to investigate the effectiveness of drained piles to reduce the liquefaction hazard in and near pile-improved ground. The effect of the number of drains per pile and the orientation of the drains relative to the direction of shaking were evaluated in consideration of the volume of porewater discharged, the magnitude of excess pore pressure generated, and the amount of de-amplification in the ground’s motion. The following main conclusions can be drawn from this study. Single, isolated piles and a group of drained piles were tested in three series of shake table tests. Relative to conventional piles, the drained piles exhibited improved performance with regard to the generation and dissipation of excess pore pressure and stiffness of the surrounding soil, with increases in performance correlated with increases in the discharge capacity of the drained pile. The acceleration time histories observed within the pile-improved soil indicated a coupling of the rate and magnitude of porewater discharge, excess pore pressure generated, and de-amplification of strong ground motion. The amount of de-amplification reduced with increases in the number of drains per pile and corresponding reductions in excess pore pressure. The improved performance should prove helpful in the presence of sloping ground characterized with low-permeability soil layers that inhibit the dissipation of pore pressure and have demonstrated the significant potential for post-shaking slope deformation.

show abstract

Development of new drain method for protection of existing pile foundations from liquefaction effects

Cited by 12 publications

References 1 publication

Earthquake Geotechnical Engineering

Earthquake Geotechnical Engineering

Performance of a Subgrade-Embankment-Seawall System Reinforced by Drainage PCC Piles and Ordinary Piles Subjected to Lateral Spreading

Seismic Performance of Drained Piles in Layered Soils

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