Model test study on the behavior of geotextile-encased sand pile in soft clay ground

Yoo, Wan-Kyu; Kim, Byoung-Il; Cho, Wanjei

doi:10.1007/s12205-012-0473-4

Cited by 15 publications

(7 citation statements)

References 6 publications

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“…As the backfill of the foundation, the calcareous sand can not only shorten the construction period but also save landfill resources, which is of great significance for the development of the modern marine economy [ 16 ]. Reviewing literature revealed that the studies on the bearing characteristics of pile foundation mainly focuses on clay [ 17 , 18 , 19 ], ordinary sand [ 20 , 21 , 22 ], loess [ 23 ], saline soil [ 24 ]. and other areas [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

Luo

Lei

et al. 2022

Materials

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Reviewing literature revealed that the studies on the bearing characteristics of pile foundations mainly focuses on clay, ordinary sand, loess, saline soil, and other areas. However, few studies on the bearing characteristics of the pile foundation in calcareous sand were conducted. Besides, existing traditional studies ignored the variation of soil compression modulus with depth, and the effect of void ratio on the transverse bearing characteristics of the pile foundation in a calcareous sand area were not well understood. In response of these problems, this study conducted a theoretical investigation on the transverse bearing characteristics of the pile foundation in a calcareous sand area. The transverse bearing characteristics of the pile foundation were derived based on the Pasternak foundation model and the Winkler foundation model, incorporating the heterogeneous distribution of compressive modulus with buried depth. The calculation results of the Pasternak foundation model are closer to the observed results than the Winkler foundation model. Therefore, the following research on the transverse bearing characteristics of the pile foundation in the calcareous sand area adopts the Pasternak foundation model. Then, the effects of the pile length, pile diameter, pile elastic modulus, horizontal load, bending moment, and void ratio on the transverse bearing characteristics of the pile foundation in a calcareous sand area were thoroughly analyzed. Furthermore, the difference between the transverse bearing characteristics of the pile foundation in a calcareous sand area and a quartz sand area was discussed. Results show that the horizontal displacement of the pile top in a calcareous sand area is greater than the quartz sand area under the same conditions.

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Section: Introductionmentioning

confidence: 99%

The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

Luo

Lei

et al. 2022

Materials

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“…In such types of soils, insufficient confinement requirements can be persuaded by encasing the column with the proper type of geosynthetics [4][5]. The impact of geosynthetic stiffness increment on ultimate load capacity improvement, settlement, and bulging reduction of geosynthetic encased columns (GECs), and excess pore water pressure change in the soft ground was investigated through the field and scaled laboratory experiments [6][7][8][9]. Murugesan and Rajagopal (2007) asserted that the most effective parameter of the instrumented GECs was the tensile strength of encasement.…”

Section: Introductionmentioning

confidence: 99%

“…Murugesan and Rajagopal (2010) examined the influence of material properties and the geometry of the model for both encased and non-encased stone columns in a large-scale laboratory test setup and suggested design codes for specific load and settlement conditions [8]. Yoo et al (2015) conducted loading tests on an artificially sedimented clay ground reinforced by geotextile-encased sand piles (GESP) and conventional sand compaction piles (SCP). Results show that the failure mode of SCPs is bulging where it is buckling for GESPs thus, the geosynthetic stiffness has nearly no effect on the load-carrying capacity in the buckling failure [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Deformation Behavior of Geosynthetic-Encased Stone Columns Supporting Embankments

Kahyaoğlu

DOĞAN

2022

Teknik Dergi

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The method of encasing the stone column with a proper type of geosynthetic material is a widely used technique to provide the required lateral confinement and to avoid the dispersion of granular column material into soft clay. Along with the improved ultimate load capacity and the reduced settlement and bulging, the geosynthetic encasement preserves the easy drainage ability of stone columns. This paper presents the finite element analysis results of a hypothetical embankment on a soft soil deposit which is improved by geotextile encased stone columns and geogrid reinforced sand mat on top. At first, numerical results of three dimensional (3D) finite element model (FEM) were validated via the experimental data of previous field studies. Afterward, parametric studies were carried out on the FEM considering the effect of the sand mat thickness, the stiffness of the geosynthetic reinforcement, and the geosynthetic encasing length and encasement stiffness on both the horizontal and vertical deformation of stone columns. Settlement differences between columns and soft soil in both the short term and long term were also determined. The optimum values of sand mat layer thickness, vertical encasement length, and geosynthetic stiffness are recommended to be used for preliminary designs.

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“…Treatment of liquefiable soil layers occurs during the construction stage, and appropriate countermeasures are taken to reinforce the soft soil in the foundation. Gravel piles and compacted sand piles are the most common treatment methods in engineering practice; they can effectively discharge pore water in the soil around the pile to reinforce the foundation [6][7][8][9]. However, for buildings that require a high bearing capacity, other pile types must be used to meet the bearing capacity requirement.…”

Section: Introductionmentioning

confidence: 99%

Field Test Investigation of the Pile Jacking Performance for Prefabricated Square Rigid‐Drainage Piles in Saturated Silt Sandy Soils

Wang¹

2019

Advances in Civil Engineering

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e 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. e 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.

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Model test study on the behavior of geotextile-encased sand pile in soft clay ground

Cited by 15 publications

References 6 publications

The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

The Transverse Bearing Characteristics of the Pile Foundation in a Calcareous Sand Area

Numerical Study on the Deformation Behavior of Geosynthetic-Encased Stone Columns Supporting Embankments

Field Test Investigation of the Pile Jacking Performance for Prefabricated Square Rigid‐Drainage Piles in Saturated Silt Sandy Soils

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