Prediction of the shaft resistance of nondisplacement piles in sand

Lashkari, Ali

doi:10.1002/nag.1129

Cited by 85 publications

(36 citation statements)

References 51 publications

(198 reference statements)

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“…Several researchers [1][2][3][4][5][6][7][8][9] did some experimental and numerical studies on the general behavior of geomaterial interfaces. However, at present, research results on adfreezing strength at the interface between arti cially frozen soil and structures are relatively few and basic.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on adfreezing strengthsat the interface between frozen fine sand and structures

2017

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Abstract. To explore the mechanisms concerning adfreezing strengths at the interface between frozen ne sand and structures, a series of experiments were conducted using a direct shear apparatus. The main results are as follows: All adfreezing strengths increased with decreasing temperature and increasing normal stress and surface roughness. Peak adfreezing strength (peak shear stress at failure) had a linear relationship with temperature, its relationship with normal stress was in line with the Mohr-Coulomb criterion, and its relationship with roughness satis ed a logarithmic function. Residual adfreezing strength (post-peak shear stress) varied with temperature and normal stress, and three typical regular patterns were presented: sustained stable, rst stable and then uctuating, and circularly uctuating. The uctuation cycle about strength curves increased with increasing roughness. An empirical formula on adfreezing strengths incorporating temperatures, normal stress, and roughness was constructed.

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Section: Introductionmentioning

confidence: 99%

Experimental research on adfreezing strengthsat the interface between frozen fine sand and structures

2017

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“…Liu et al . and Lashkari introduced critical state compatible models for sand–structure interfaces. Such models can simulate the interfaces behavior in a wide domain of density and stress values using a unique set of parameters.…”

Section: Introductionmentioning

confidence: 99%

“…None of the aforementioned interface models (i.e., ) as well as their basic platform (i.e., ) are state‐dependent, and hence, they require multiple calibrations for a wide domain of initial states. Recently, Lashkari adopted a number of concepts from the work of Chiu and Ng and generalized the interface model of Lashkari for the modeling of unsaturated interfaces.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The elasto‐plastic model of Lashkari can only deal with dry and saturated interfaces. In this paper, formulation of the model of Lashkari is extended in such a way that it can simulate the mechanical behavior of unsaturated interfaces as well as dry and saturated interfaces without the need for multiple calibrations associated with the change in matric suction. To this aim, the model formulation is established in terms of two pairs of stress and strain‐like variables: skeleton (effective) stress vector and modified matric suction as stress variables and strain vector and degree of saturation as strain variables.…”

Section: Introductionmentioning

confidence: 99%

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A constitutive model for unsaturated soil–structure interfaces

Lashkari

Kadivar

2015

Num Anal Meth Geomechanics

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SUMMARYA constitutive model for simulation of the behavior of unsaturated interfaces is presented here. The model is an extension of an existing critical state compatible interface model for dry and saturated interfaces that was already proposed by one of the authors [Lashkari, A. 2013. Int. J. Numer. Anal. Meth. Geomech. 37(8): 904-931]. For a proper simulation of the behavior of partially saturated interfaces, the extended model is formulated in terms of two pairs of work conjugate stress-strain-like variables. The modified model simulations are compared with the existing data of dry, unsaturated, and saturated interfaces. For each interface type, it is shown that the proposed model can capture the essential elements of the behavior using a unique set of parameters.

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Hypoplastic interface models for fine‐grained soils

Stutz

Maš́ın

2016

Num Anal Meth Geomechanics

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Summary Contact descriptions for interfaces between structural elements (e.g. piles, anchors and tunnel‐linings) and soils are widely used in geotechnical engineering. Most of these constitutive interface models, developed for sands, consider 2D conditions. For clays, only a limited number of 3D interface models exist. In this paper, the fine‐grained continuum models based on hypoplastic theories are adapted for the constitutive modelling of fine‐grained interfaces. To this end, we develop a general approach to convert the existing continuum soil models into an interface model adopting reduced stress and strain‐rate vectors and redefining tensorial operations in such a way that the formulation of the existing continuum models can be used without much modification. The hypoplastic Cam‐clay and the explicitly formulated hypoplastic models are adapted to model the interface behaviour. In addition to the reduced stress and strain tensor formulations, we introduce an additional variable reducing the strength and stiffness of the interfaces when compared with the strength and stiffness of the soil. For verification, experiments in constant volume and constant normal stress conditions have been simulated. A comparison of the available experimental data from the literature and the simulations is presented. It is shown that the new hypoplastic interface models can describe a number of important phenomena of clay–structure interfaces. Copyright © 2016 John Wiley & Sons, Ltd.

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Prediction of the shaft resistance of nondisplacement piles in sand

Cited by 85 publications

References 51 publications

Experimental research on adfreezing strengthsat the interface between frozen fine sand and structures

Experimental research on adfreezing strengthsat the interface between frozen fine sand and structures

A constitutive model for unsaturated soil–structure interfaces

Hypoplastic interface models for fine‐grained soils

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