Failure modes and bearing capacity of strip footings on soft ground reinforced by floating stone columns

Zhou, Haizuo; Diao, Yu; Zheng, Gang; Han, Jie; Jia, Rui

doi:10.1007/s11440-017-0535-3

Cited by 36 publications

(11 citation statements)

References 41 publications

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“…Table 1 shows the values of the ultimate bearing-capacity (qu), calculated using the present numerical model, and compared to those obtained from the experimental tests of Hu (1995) [3], from the finite difference method of Zhou et al (2017) [17] And from the theoretical approach (slices method) studied by Khalifa et al (2017) [30]. Seven cases of soil-reinforcement system are considered, with different material properties and are presented in Table 1.…”

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

“…The parameters used in this study are shown in Figure 1. For convenience of presentation, results are presented in a form using dimensionless parameters: The values of material and geometry parameters used in the analysis are reported on Table 2; they are selected according to the typical ranges adopted in most recent studies [2,17]. The column length ratio (L/B) and the area replacement ratio (As) are respectively selected in the practical ranges of (0.5-4.5) and (10-40%), keeping the same spacing (S=1.4m) among the columns.…”

Section: Data and Parameters Of Studymentioning

confidence: 99%

“…For numerical studies, finite element and finite difference method codes were used for predicting the bearingcapacity of stone columns in reinforced-soils for two and three-dimensional models [16]. Zhou et al [17] adopted a numerical simulation to study the effects of surcharge on the mode of failure, and investigated the bearing-capacity factors of a strip footing supported by a group of floating stone column. Lee and Pande (1998) [18] have used the homogenization technique to predict the bearing-capacity of the soil-reinforcement system based on elastoplastic analysis.…”

Section: Introductionmentioning

confidence: 99%

“…Najjar et al (2010) and Black et al (2007) [23][24][25] reported that the value of the critical-length could be reached for a ratio (L/D=6), where (L) and (D) are the length and the diameter of the column respectively. Hughes and Withers (1974) [4] Found that no increase in the bearing-capacity was noted up to (L/D=4), while Zhou et al (2017) and Das (1989) [17,26] used the ratio of column length to footing width, in order to define the critical-length; it was reported that this value is reached for (L/B=2) and (L/B=3), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, as the footing is assumed to be rigid , the soft-soil and the stone columns will have the same amount of displacement (settlement), then, no differential settlement will occur, hence interface element between the stone columns and soft-soil is not necessary [2,29]. In addition, because of the high loading rate and the low permeability the soft-soil is assumed to be undrained [17].…”

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Optimization of the Ultimate Bearing Capacity of Reinforced Soft Soils through the Concept of the Critical Length of Stone Columns

et al. 2021

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The objective of this paper is to develop an analytical equation based on the concept of the critical-length of columns in order to optimize the ultimate bearing-capacity of soft soils, supporting a strip footing and reinforced by a group of floating stone columns. Optimization procedure was performed on three-dimensional numerical models simulated on the Flac3D computer code, for various soft-soils with different undrained-cohesions (Cu=15–35kPa), reinforced by columns of varying lengths (L) and area replacement ratio (As=10-40%), considering different footing widths B. Obtained results indicate that the optimal bearing-capacity ratio (Ultimate bearing-capacity of reinforced soil/unreinforced soil) is reached for the column critical-length ratio (Lc/B) and increase with increase of the later ratio, depending on As and Cu. Analysis of results also showed that the optimal values of the bearing-capacity ratio in the reinforced soils remain bounded between the lower and higher values (1.28-2.32), respectively for minimal and maximal values of the critical-length ratio (1.1) and (4.4). Based on these results, a useful analytical equation is proposed by the authors, for the expression of the critical-length; thus ensuring an optimal pre-dimensioning of the stone columns. The proposed equation was compared with the data available in the literature and showed good agreement. Doi: 10.28991/cej-2021-03091737 Full Text: PDF

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Section: Validation Of the Numerical Modelmentioning

confidence: 99%

Section: Data and Parameters Of Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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Optimization of the Ultimate Bearing Capacity of Reinforced Soft Soils through the Concept of the Critical Length of Stone Columns

et al. 2021

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Investigating the performance of stone columns in an extremely soft clay—A case study

Harelimana

Ping

Gao

et al. 2022

Structural Design Tall Build

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Summary Stone columns are used to improve soft soils; however, they fail through bulging, punching, and lateral expansion when the soil is extremely soft. The present study investigated the performance of stone columns in an extremely soft clay (ESC) through the addition of the appropriate geosynthetic materials. Field test was conducted for the foremost purpose of obtaining the optimal spacing between the consecutive stone columns and therefore prevents the failures of stone columns in ESC soils. The study further examined the failure modes of stone columns for the case of ESC soils. The computer programming software FLAC 3D was used for modeling and simulation, while Auto CAD was used to draw needed geometries of the case study. The results revealed that the full encasement of the stone column with suitable geogrids, optimal spacing, and proper design of cushion will enable the efficient use of stone columns as a composite foundation in ESC. The considered appropriate thickness of the cushion was found to be 30 cm, and this cushion helps the embedded soft clay soils to work together with the installed encased stone columns in ESC soils. The center‐to‐center (optimal) spacing between two consecutive stone columns showed optimal performance at distance S ≤ 5d of the diameter of the stone column. These findings show that stone column encased with suitable geogrids and optimal spacing will improve the bearing capacity, reduce settlement, and decrease the lateral deflection as well as hoop strain of the foundation.

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Behavior of Rigid Footing Rested on a Group of Stone Column

Bhaumik

Singh

Biswas

2021

Lecture Notes in Civil Engineering

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Failure modes and bearing capacity of strip footings on soft ground reinforced by floating stone columns

Cited by 36 publications

References 41 publications

Optimization of the Ultimate Bearing Capacity of Reinforced Soft Soils through the Concept of the Critical Length of Stone Columns

Optimization of the Ultimate Bearing Capacity of Reinforced Soft Soils through the Concept of the Critical Length of Stone Columns

Investigating the performance of stone columns in an extremely soft clay—A case study

Behavior of Rigid Footing Rested on a Group of Stone Column

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