Loading Behavior and Soil-Structure Interaction for a Floating Stone Column under Rigid Foundation: A DEM Study

Liu, Feng; Guo, Panpan; Hu, Hai Feng; Zhu, Chengwei; Xiao-nan, Gong

doi:10.1155/2021/9508367

Cited by 4 publications

(3 citation statements)

References 49 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The column increases radial stress in the soft clay's upper section. The stress concentration ratio drops from 2.5 to 1.55 after loading [6]. Stone column rigidity greatly affected consolidation speed in a laboratory study.…”

Section: Introductionmentioning

confidence: 92%

Numerical Study of Stress Distribution in Soft Clay Treated with Stone Column

Al-Waily,

Al-Qaisi

2023

E3S Web Conf.

View full text Add to dashboard Cite

This study used a finite element analysis approach employing Plaxis 3D to analyze the stress concentration ratio, a critical parameter in geotechnical engineering, to examine stresses operating on stone columns and soft soils. This study also looked at the effect of the stiffness ratio between the stone column and the neighboring soil. With the same length and three different diameters, 0.8 m, 1.0 m, and 1.2 m, or three area replacement ratios ranging from 7% to 16%, respectively, floating and end-bearing stone columns were used. The influence of soft soil undrained cohesion, cu ranging from 6 kPa to 40 kPa, was also considered in the current study. The stiffness ratio for columns to adjacent soil, end bearing or floating stone column, and area ratio all have a significant impression on the performance of the stone column in treating soft soil and stress transmission mechanisms in the enhanced soil body, according to parametric studies. The average stress concentration ratio in soil improved with an end-bearing stone column of φ= 35° and raised to 2.63 and 4.71 at φ = 50°, ranging from 1.41 to 2.35 for area replacement ratios of 7% and 16%.

show abstract

Section: Introductionmentioning

confidence: 92%

Numerical Study of Stress Distribution in Soft Clay Treated with Stone Column

Al-Waily,

Al-Qaisi

2023

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…The numerical simulation could detail the pile-soil interaction, which was one of important factor in affecting the study of underground structures [13][14][15][16]. The numerical method was used to study the floating stone column installed in the soft layer and achieved good results [17][18][19][20]. Moreover, most previous studies focused on either ordinary floating stone column [21,22] or end-bearing geosynthetic-encased stone column [23,24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Behavior of Floating Geogrid-Encased Stone Column Improved Foundation

Cheng

Cai

et al. 2023

Buildings

View full text Add to dashboard Cite

The ordinary (OSC) and geosynthetic-encased stone column (ESC) with different bearing strata significantly influenced its behavior. The paper established seven models for studying the behavior of floating stone columns using the finite difference method (FDM). The effect of geogrid and column length on the load-settlement behavior, bulging deformation, failure mode, and load transfer coefficient were also analyzed based on proposal models. The results showed that the bearing capacity of F-OSCs and F-ESCs increased with the increase in column and encasement length, respectively, and a critical length (i.e., 4D, where D was the column diameter) was found in settlement improvement. The bulging deformation was significant in F-OSCs and was observed at the top of a long column and the full length of a short column. The geogrid encasement could constrain the OSC to decrease the bulging deformation. The failure mode in F-OSCs was mainly a punching failure with bulging deformation for a short column (e.g., less than 4D), and was relative to the vertical pressure for a long column. The failure mode in F-ESCs was a punching failure, and the punching degree increased with an increase in encasement length. The load transfer coefficient of F-OSCs or F-ESCs was relatively stable as the column length increased to a critical value (e.g., 4D) or the encasement length increased to a critical value (e.g., 4D).

show abstract

“…The DEM is widely used in geotechnical engineering [44][45][46][47], which has advantages in simulating the gravels of the column. Liu [48] and Gu [49] used the discrete element method to simulate the stone columns in soft clay. The aggregates that make up the column are simulated by balls with different characteristics and sizes.…”

Section: Introductionmentioning

confidence: 99%

A DEM Study on Bearing Behavior of Floating Geosynthetic-Encased Stone Column in Deep Soft Clays

Liu

Guo

et al. 2023

Applied Sciences

View full text Add to dashboard Cite

The use of geosynthetic-encased stone columns has been proven to be an economical and effective method for soft soil foundation treatment. This method is widely used in civil engineering projects at home and abroad. When the geosynthetic-encased stone columns are applied to deep soft clays, they are in a floating state. The load-bearing deformation mechanism of geosynthetic-encased stone columns has changed. The interaction between the aggregates, geogrid, and soil is worth studying, especially at the bottom of the column. In this paper, the discrete element method is used to simulate a floating geosynthetic-encased stone column with a 280 mm encasement depth in deep soft clays. The load-bearing deformation characteristics and mesoscopic mechanism of the floating geosynthetic-encased stone column are studied. The results show that there are large vertical and radial stresses in the top region. Moreover, the porosity and sliding fraction of aggregates in this region increase with settlement, and the coordination number decreases with settlement. The vertical and radial stresses of the soil near the column body are not affected much by the column body. When the encasement depth exceeds 280 mm, the bearing capacity of the FGESC does not increase much. The encasement depth controls the failure mode of the floating geosynthetic-encased stone column. As the encasement depth increases, the failure mode of the floating geosynthetic-encased stone column gradually transitions from swelling deformation to penetration failure.

show abstract

Loading Behavior and Soil-Structure Interaction for a Floating Stone Column under Rigid Foundation: A DEM Study

Cited by 4 publications

References 49 publications

Numerical Study of Stress Distribution in Soft Clay Treated with Stone Column

Numerical Study of Stress Distribution in Soft Clay Treated with Stone Column

Numerical Analysis on the Behavior of Floating Geogrid-Encased Stone Column Improved Foundation

A DEM Study on Bearing Behavior of Floating Geosynthetic-Encased Stone Column in Deep Soft Clays

Contact Info

Product

Resources

About