A Method of Settlement Calculation of Ground Improved by Floating Deep Mixed Columns Based on Laboratory Model Tests and Finite Element Analysis

Liu, Shechuan; Dingwen, Zhang; Song, Tao; Zhang, Guolong; Li-bin, Fan

doi:10.1007/s40999-021-00662-4

Cited by 12 publications

(5 citation statements)

References 31 publications

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“…It seems that the stress distribution on the top of the lower layer was nearly uniform in this study. It should be noted that the penetration of the columns (less than 10 mm in this study) was not considered in the proposed method for settlement calculation but can be estimated using the simple equations proposed by Pongsivasathit et al (2013) and Liu (2022) with correction. Theoretical equations proposed by Chen et al (2008) and Zhou et al (2021) can be also used to consider both penetration of columns and column-soil interaction.…”

Section: Experiments Resultsmentioning

confidence: 99%

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

Feng

Qin

et al. 2023

Int. J. Geomech.

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For soft soils, the creep settlement plays an important role in the full life-cycle performance of infrastructures, which is a serious concern for engineers and researchers. Columns, e.g. deep cement mixed (DCM) soil columns, are commonly adopted to treat soft grounds in order to reduce the full-life settlement of the infrastructures. However, the creep behavior of soft grounds treated by DCM soil columns is often neglected, inducing underestimated total settlements or unexpected differential settlements. In this study, a new calculation method is developed for the life-cycle settlement of column-improved soft grounds by considering the creep of soft soils and load transfer between the columns and surrounding soils. A physical model test with double-layer soils improved by DCM soil columns was designed and performed to demonstrate the feasibility of the calculation method. It is found that the settlements calculated by the proposed method show good agreement with the measured data in the physical model. A parametric study was conducted, revealing that the calculated settlement of the double-layer soil improved by DCM columns can be largely influenced by the stress concentration ratio, the permeability of the DCM columns, and the area replacement ratio. Finally, the proposed method was applied to calculate the settlement in a real project.

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Section: Experiments Resultsmentioning

confidence: 99%

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

Feng

Qin

et al. 2023

Int. J. Geomech.

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“…The soil settlement distribution can be balanced to a certain extentby changing the foundation stiffness [3]. FEA has been widely used in civil engineering, providing an effective means for the study of foundation design [4][5]. Therefore, the study aims toanalyzehow FSA affects differential settlement by using FEA.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Stiffness Adjustment of Foundation Based on FEA on Un-Even Settlement

Chen,

Wang,

et al. 2024

IEEE Access

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Foundation settlement is a common problem in civil engineering. In the case of un-even settlement, it can lead to structural de-formation and damage, which seriously affects the safety and reliability of the project. Therefore, the influence of adjusting the stiffness of the foundation on un-even settlement was analyzed through finite element analysis to effectively solve un-even settlement. By simulating the settlement of soil under different foundation stiffness and load conditions, the influence of foundation stiffness adjustment on soil de-formation and settlement distribution was analyzed, and its impact on structural safety was evaluated. These studies confirmed that thickened layers could effectively solve the un-even settlement. Within the range of 0.2 to 1.0 meters, the difference in thickness was the greatest. The adjustment of differential settlement by layer thickness was phased and decreased with increasing thickness. Adjusting the stiffness of the foundation could effectively solve un-even settlement, reduce differences in soil settlement, and improve the overall stability and safety of the structure. These results have important guiding significance for the design of foundation and the solution of un-even settlement problems in engineering practice and provide certain reference and basis for further research.

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“…Soil reinforcement using stone columns and geosynthetics has been widely used as an important method of soil reinforcement. There have been a wide number of studies based on analytical [3][4][5][6][7], experimental [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], and numerical [7,19,21,[23][24][25][26][27] analyses on soil reinforcement. There are also various state-of-the-art studies which signify the need for such types of analyses [28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Horizontally Layered and Vertically Encased Geosynthetic Reinforced Stone Column: An Experimental Analysis

Srijan

Gupta

2023

Applied Sciences

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Because of the smaller confinement of the neighbouring soil in very weak soils, the carrying capacity of stone columns may not substantially increase. Geosynthetics can be used to reinforce columns by employing vertical encasement or horizontal layers. In the present study, large-scale laboratory investigations were carried out to evaluate the efficacy of vertical encasement and horizontal layering geosynthetics on the performance behaviour of soft clay. A series of tests were carried out for a horizontal layering of a geotextile with an equal distance throughout the height of the column (the total height of the column is ‘L’); horizontal layering over only the top half (i.e., 0.5 L from the head of the considered column); and horizontal layering over only the bottom half of the column (0.5 L from the centre to the foot of the column). Tests were also carried out for vertical encasement in the form of vertically encased stone columns (VESCs) that were employed for various lengths of encasement (i.e., L, 0.75 L, 0.5 L, 0.25 L). The tests were conducted for three different diameters of stone columns, i.e., 50 mm, 75 mm, and 100 mm. As per the findings, the utilisation of horizontal and vertical reinforcing layers enhances the carrying capability of stone columns. Moreover, because of their interlocking and frictional actions with the aggregates of stone columns, the layering decreases the lateral bulging of the considered stone columns. A comparison was performed to find the effectiveness of the horizontal and vertical types of reinforcement, and it was observed that VESCs with full-length encasement and a geotextile with a higher tensile strength for a 100 mm diameter of the stone column were the most desirable arrangements among all.

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A Method of Settlement Calculation of Ground Improved by Floating Deep Mixed Columns Based on Laboratory Model Tests and Finite Element Analysis

Cited by 12 publications

References 31 publications

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

A New Calculation Method for Life Cycle Settlement of Soft Ground with Creep Treated by Columns

The Influence of Stiffness Adjustment of Foundation Based on FEA on Un-Even Settlement

Horizontally Layered and Vertically Encased Geosynthetic Reinforced Stone Column: An Experimental Analysis

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