Numerical Modeling of Piles in Collapsible Soil Subjected to Inundation

Noor, Sarah Tahsin; Hanna, Adel; Mashhour, Ibrahim

doi:10.1061/(asce)gm.1943-5622.0000235

Cited by 27 publications

(12 citation statements)

References 19 publications

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“…Step 2a-1 is to address the strength reduction of unsaturated soils due to inundation, as described in [3]. It was previously noted that reduction in φ value of the soil adjacent to the pile shaft has minor influence on the magnitude of drag load, as calculated from the PLAXIS output.…”

Section: Numerical Modelmentioning

confidence: 99%

“…The correlation between volumetric strain and collapse strain is given in [3]. The above numerical model was employed to derive the mathematical functions that define the coefficients of analytical models developed in this study.…”

Section: Inmentioning

confidence: 99%

“…A numerical procedure is available for predicting drag load induced on pile in collapsible soil [3]. In that procedure, for all the pile-soil interface elements, the angle of friction was considered 0.9φ´ that corresponds to the angle of static friction for bored cast-in-situ pile.…”

Section: Literature Review and Present Status: Prediction Of Drag Loadmentioning

confidence: 99%

“…As the study considered only the cases, in which the variable parameters were close to their lower limits of their respective practical ranges, good agreements between the experimental and the numerical results were found without addressing this issue. Moreover, the constraints of using the equation given in [3] are that radius of wetting (h) was kept constant, and collapse potential was varied up to 10% only, while developing the equation. In addition, the depth of neutral plane was assumed to develop at the bottom of the collapsing soil.…”

Section: Literature Review and Present Status: Prediction Of Drag Loadmentioning

confidence: 99%

“…In simulating the inundation of collapsible soil, the procedure given in [3] proposed to carry out the finite element calculation in three steps [Steps 1, 2a and 2b].…”

Section: Numerical Modelmentioning

confidence: 99%

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Numerical and Analytical Modeling for Predicting Drag Load Induced on Pile in Collapsible Soil because of Inundation

Noor¹

2017

TOCIEJ

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Introduction:Negative skin friction that develops on the pile surface when the soil (adjacent to the pile shaft) settles but the pile is in static condition, causes an additional load (known as drag load) induced on pile. Substantial settlement of collapsible soil occurs only because of inundation. In such a case, the magnitude of drag load is influenced by several parameters, such as the collapse potential, inundation pressure, pile roughness, pile diameter, radius of wetting, depth to the neutral plane, and thickness of collapsible soil subjected to inundation. Methods:A numerical model is developed to simulate the case of a single pile in collapsible soil to predict negative skin friction and drag load by giving consideration to kinetic friction angle between the pile and the settling soil. The comprehensive interdependent relation among the parameters influencing the magnitude of drag load was revealed based on numerical results. Analytical models are developed for predicting the average negative skin friction and depth of neutral plane to quantify drag load because of the inundation of collapsible soil adjacent to the pile shaft. Result and Conclusion:The model coefficients were determined by analyzing the numerical results. The drag loads obtained from the analytical model developed and those from previous experimental studies are found in good agreement. For a given soil profile, the magnitude of drag load is found to vary widely (e.g., between 252 and 925 kN) because of the variations in the pile diameter, pile roughness, and radius of wetting. Thus, this study provides a design guideline for choosing the design pile diameter considering the magnitude of drag load due to inundation of collapsible soil adjacent to the pile shaft.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Inmentioning

confidence: 99%

Section: Literature Review and Present Status: Prediction Of Drag Loadmentioning

confidence: 99%

Section: Literature Review and Present Status: Prediction Of Drag Loadmentioning

confidence: 99%

“…In simulating the inundation of collapsible soil, the procedure given in [3] proposed to carry out the finite element calculation in three steps [Steps 1, 2a and 2b].…”

Section: Numerical Modelmentioning

confidence: 99%

See 3 more Smart Citations