Numerical analysis of foundation columns to support widening of embankments

Han, Jie; Öztoprak, Sadık; Parsons, Robert L.; Huang, Jie

doi:10.1016/j.compgeo.2007.01.006

Cited by 152 publications

(63 citation statements)

References 4 publications

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“…The subsoil, the gravel cushion, and the sand fill were modeled as linearly elastic-perfectly plastic materials with Mohr-Coulomb failure criteria (Han et al, 2007;Abusharar et al, 2009). The PHC pile with a cap and the geogrid were modeled as linearly elastic materials.…”

Section: Numerical Modelingmentioning

confidence: 99%

Influence of Number of Geosynthetic Layers on the Performance of Geosynthetic-reinforced Pile-supported Earth Platforms on Soft Soil: Numerical Study

Zhang¹,

Wang²,

Ye³

et al. 2017

dtmse

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Geosynthetic-reinforced pile-supported earth platforms have been increasingly used to support infrastructures, such as embankments, retaining walls, and storage tanks constructed over soft soils around the world. On the top of piles, one or more layers of geosynthetics are usually placed. However, the effect of number of geosynthetic layers on the behavior of geosynthetic-reinforced pile-supported earth platforms has not been well explored so far. Based on a well-instrumented large-scale test, a threedimensional (3-D) numerical study was conducted to investigate the behavior of geosynthetic-reinforced pile-supported earth platforms with different number of geosynthetic layers. The numerical results showed that the inclusion of geosynthetics enhanced the efficiency of load transfer. The critical heights of soil arching were almost constant with different numbers of reinforcement layers. The maximum tensile strain in the lower reinforcement was on the edge of pile caps while the maximum tensile strain in the upper reinforcement was close to the pile center. When the square caps were installed in a triangular pattern, the maximum strain in reinforcement is concentrated in the strip bridging two adjacent cap corners.

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Section: Numerical Modelingmentioning

confidence: 99%

Influence of Number of Geosynthetic Layers on the Performance of Geosynthetic-reinforced Pile-supported Earth Platforms on Soft Soil: Numerical Study

Zhang¹,

Wang²,

Ye³

et al. 2017

dtmse

Self Cite

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“…Jet grouting has been deemed as one of the most widely used ground improvement techniques for strengthening soft soil deposits and preventing groundwater seepage from leaking fractures or fissures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Jet grouting is frequently used for the launching of shield machines or tunnel construction in complex geological conditions.…”

Section: Introductionmentioning

confidence: 99%

Simple Method to Predict Ground Displacements Caused by Installing Horizontal Jet-Grouting Columns

Wang

Shen

Cheng

2018

Mathematical Problems in Engineering

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During the horizontal jet grouting in soft ground, injection of large volumes of water and grout into the soil can lead to significant ground displacements. A simple method is proposed in this paper to predict the ground displacements caused by installing horizontal jet-grouting columns. The process of installing a horizontal column is simplified as the expansion of a cylindrical cavity with a uniform radial stress applied at plastic-elastic interface in a half plane. In this study, the analytical solution is adopted to calculate the deformation induced by the expansion of a cylindrical cavity. Considering the main jetting parameters (jetting pressure of the fluid, flow rate of the fluid, and withdrawal rate of the rod) and the soil properties (stiffness of the surrounding soil), an empirical equation to estimate the radius of plastic zone is developed. Two field tests are carried out in Shanghai, China, to verify the correctness and applicability of the proposed method. Comparisons between the predicted and measured values indicate that the proposed method can provide a reasonable prediction. The proposed simple method can be recommended as a useful tool for the design of ground improvement by means of horizontal jet grouting.

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“…This approach is directly inspired by a long line of constitutive models originally developed for naturally structured soils and soft rocks ( [7], [8] , [9], [10]) Despite all those developments it is fair to say that simplified, elastic perfectly plastic models (with either a Mohr-Coulomb or Tresca failure criterion) still dominate numerical applications (e.g. [11], [12]). It is accepted that this type of model may neglect many important features of cemented soil behaviour, but it appears easy to calibrate.…”

Section: Introductionmentioning

confidence: 99%

Simplifying calibration of bonded elasto-plastic models

Rı́os

Ciantia

González

et al. 2016

Computers and Geotechnics

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Using realistic constitutive models for artificially cemented soils is advantageous in design. However, the price of that increased realism is often a more elaborate model, which is difficult to calibrate. A database of high quality triaxial tests on compacted cemented silty sand is used to calibrate and validate a generalized critical state bonded soil model. The exercise highlights the staged calibration procedure that is convenient in this kind of application. The calibration results have shown a direct relation between added yield strength and a well-established soil-cement mixture ratio, which facilitates the application of the model in design. It is shown that such relation can be also deduced from the analysis of unconfined compressive strength tests.

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Numerical analysis of foundation columns to support widening of embankments

Cited by 152 publications

References 4 publications

Influence of Number of Geosynthetic Layers on the Performance of Geosynthetic-reinforced Pile-supported Earth Platforms on Soft Soil: Numerical Study

Influence of Number of Geosynthetic Layers on the Performance of Geosynthetic-reinforced Pile-supported Earth Platforms on Soft Soil: Numerical Study

Simple Method to Predict Ground Displacements Caused by Installing Horizontal Jet-Grouting Columns

Simplifying calibration of bonded elasto-plastic models

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