Field test of a geogrid-reinforced and floating pile-supported embankment

Cao, Weizhong; Zheng, Jun; Zhang, J.; Zhang, Rui-xue

doi:10.1680/jgein.16.00002

Cited by 63 publications

(9 citation statements)

References 25 publications

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“…The shear force l s F is calculated by Equation (3). Due to the symmetry of the laboratory test setup, it is sufficient to simulate only one section of the trapdoor test model.…”

Section: Dem Modelingmentioning

confidence: 99%

“…Piled embankments have been widely adopted to overcome intolerable total or differential settlements, large lateral displacements of highway, and railway engineering, especially for embankments constructed over soft soils [1][2][3][4][5][6][7][8][9]. Soil arching effect is a ubiquitous phenomenon occurred in the piled embankment to transfer the vertical stress from the relatively stiff pile to the softer soil due to the differential settlement [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Soil Arching of Piled Embankment in Equal Settlement Pattern: A Discrete Element Analysis

et al. 2021

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Soil arching, which occurs in the piled embankments, plays an important role in stress redistribution between the relatively soft subsoil and the stiffer piles. The formation of the soil arching depends on the differential settlement of the embankment fill above the pile and the subsoil. The soil arching effect is barely investigated in the literature from the perspective of differential settlement of piles and soils. Based on the discrete element method (DEM), this paper develops a classic trapdoor test model to investigate the differential settlement in piled embankment during the downward movement of the trapdoor, and to explore the formation mechanism of soil arching in equal settlement pattern by changing the width of the pile cap and the height of the embankment. Due to symmetry, only one section of the laboratory test model is simulated herein. It was found that the soil arching formed under the equal settlement pattern remained unchanged after a certain degree of development, and the height of the equal settlement did not change at 0.7(s-a), where s is the pile spacing, and a is the width of the pile cap. The height of the embankment (H) and the width of the pile cap (a) have a significant influence on the formation of the equal settlement pattern when the width of the trapdoor is kept constant. Both the decrease in “H” and the increase in “a” facilitate the differential settlement of the soil between the piles and the pile-soil, enabling the slip surface to develop upward gradually, thereby hindering the formation of the equal settlement pattern.

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“…The shear force l s F is calculated by Equation (3). Due to the symmetry of the laboratory test setup, it is sufficient to simulate only one section of the trapdoor test model.…”

Section: Dem Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Soil Arching of Piled Embankment in Equal Settlement Pattern: A Discrete Element Analysis

et al. 2021

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“…Xu et al [13] comparatively studied the long-term deformation of rockfill embankment under heavy loads through field creep test and numerical simulation, and the results are sensitive to the surrounding environment. Cao et al [14] designed a large field test and studied the deformation behaviours of embankment under the reinforcement of geogrids and supports of floating piles, but the test period is generally limited. The field test can observe the deformation behaviour of embankment, but the test period is lengthy and the test results are sensitive to environmental changes.…”

Section: State Of the Artmentioning

confidence: 99%

Stability of High Rockfill Embankment Based on Orthogonal Test and Numerical Simulation

2020

Teh. vjesn.

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The parameters of rockfill materials are important factors that influence the stability of high rockfill embankment. However, the influencing laws of parameter changes on the deformation of high rockfill embankments still remain unknown. To deepen understanding on the influencing laws of parameters of rockfill materials on the stability of high rockfill embankment, a case study using an orthogonal test and numerical simulation was conducted on the high rockfill embankment with 50.6 m banking in the secondary road reconstruction project of the national highway 316 from Xunyang to Ankang in the Shaanxi Province of China. The influences of elasticity modulus, dry density, Poisson's ratio, frictional angle, and cohesion on the stability of high rockfill embankment were analyzed. A three-dimensional numerical model of high rockfill embankment was constructed using FLAC3D, and a numerical simulation of the embankment deformation was performed using the maximum settlement of embankment as the evaluation index. The influences of different factors on the deformation of high rockfill embankment were evaluated through a numerical simulation based on the orthogonal test to verify the accuracy of the orthogonal test. In addition, the deformation law of high rockfill embankment was examined. Research results demonstrate that dry density predominantly influences the stability of high rockfill embankment, followed by elasticity modulus, Poisson's ratio, cohesion, and frictional angle. The optimal combination of parameters of rockfill materials was concluded from further analysis. The numerical simulation and orthogonal test results are consistent. The top surface of the high rockfill embankment develops settlement deformation during the construction period, accompanied by outward lateral squeezing trend at the foot of slope. The vertical deformation consists of settlement first and then upheaval. Research conclusions can provide some references for the reasonable selection of rockfill materials for embankment and the stability analysis of high rockfill embankment.

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“…R. P. Chen [19] showed that substratum settlements account for a large proportion of the total settlement in an embankment, and the proportion of substratum settlement can be reduced by changing the pile length and, therefore, that the total settlement can be controlled. Cao [20] studied the reinforcement effect and the mechanism of pilesupported reinforcement technology in medium-low compressible soil and analyzed the deformation characteristics of foundation settlements and reinforced cushions. Zhang [21] studied the working behavior of pile-supported reinforced embankments in bridge head sections.…”

Section: Introductionmentioning

confidence: 99%

Field Test on Deformation Characteristics of Pile-Supported Reinforced Embankment in Soft Soil Foundation

Wang

Yang

et al. 2022

Sustainability

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In this work, the settlement deformation of the soft-soil subgrade and the deformation law of the geogrid were studied based on field tests carried out on the pile-supported reinforced embankment of the Rongwu Expressway in the Xiong’an New Area. The settlement and deformation law of the reinforcement area and the underlying layer of the pile-supported reinforced embankment, the settlement law of the transverse and longitudinal sections of the subgrade, and the deformation law of the bidirectional geogrid were analyzed. The results show that reducing the pile spacing and embankment height can effectively reduce the foundation settlement. The change in the pile spacing mainly affected the settlement in the reinforcement area, while the embankment height mainly affected the substratum settlement; the differential settlement in the subgrade cross-section was mainly caused by the settlement in the reinforcement area. The settlement at the center of the subgrade was obviously higher than that at the shoulder. In terms of the geogrid deformation law of the subgrade cross-section, the geogrid deformation at the center line of the subgrade was the largest. With the increase in the distance from the center line, the geogrid deformation gradually decreased. In terms of the deformation law of the biaxial geogrid, the tensile deformation of the geogrid in the center of two piles was greater than that in the center of four piles. The transverse tensile deformation of the geogrid was greater than the longitudinal tensile deformation. The tensile stress of the reinforced materials was calculated according to four specifications, and the applicability of various methods was evaluated.

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Field test of a geogrid-reinforced and floating pile-supported embankment

Cited by 63 publications

References 25 publications

Soil Arching of Piled Embankment in Equal Settlement Pattern: A Discrete Element Analysis

Soil Arching of Piled Embankment in Equal Settlement Pattern: A Discrete Element Analysis

Stability of High Rockfill Embankment Based on Orthogonal Test and Numerical Simulation

Field Test on Deformation Characteristics of Pile-Supported Reinforced Embankment in Soft Soil Foundation

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