Numerical analysis of pile behaviour under lateral loads in layered elastic–plastic soils

Yang, Zhaohui; Jeremić, Boris

doi:10.1002/nag.250

Cited by 126 publications

(34 citation statements)

References 11 publications

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“…A similar problem is encountered in critical state soil mechanics in modeling the shearing behavior of sands from the overconsolidated or underconsolidated state toward the critical state at which shear strength and porosity remain constant. In soil mechanics, this evolution is usually modeled using a discrete element approach to granular flow [Brown and Shie, 1990;Chen and Martin, 2002;Muqtadir and Desai, 1986;Yang and Jeremic, 2002] but such approaches have so far been restricted to considering mainly elastic/frictional interactions between grains. We have therefore chosen to establish a very simple set of microstructural equations relating tan y and A c to porosity f. While these are clearly oversimplifications, and may not be fully internally consistent with the assumed microstructural model, they embody the trends known to occur in granular media and they satisfy a number of crucial microstructural constraints, as shown below.…”

Section: Microstructural Model and Associated State Variablesmentioning

confidence: 99%

A microphysical model for strong velocity weakening in phyllosilicate‐bearing fault gouges

2007

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[1] Previous rotary shear experiments, performed on a halite-muscovite fault gouge analogue system have shown that the presence of phyllosilicates, under conditions favoring the operation of cataclasis and pressure solution in the matrix phase, can have major effects on the frictional behavior of gouges. While 100% halite and 100% muscovite samples exhibit rate-independent frictional/brittle behavior, the strength of mixtures containing 10-30% muscovite is both normal stress and sliding velocitydependent. At high sliding velocities (>1 mm s À1 ), such mixtures show unusually marked velocity weakening, along with the development of a structureless, cataclastic microstructure. In the present paper, a micromechanical model is developed in an attempt to explain this behavior. The model assumes a granular flow process involving competition between intergranular dilatation and compaction by pressure solution. The predictions of the model agree favorably with the experimental results. Extension of the model to quartz-mica systems implies that the presence of phyllosilicates plus the operation of pressure solution can strongly promote (unstable) velocity-weakening behavior at rapid slip rates on natural faults, under midcrustal conditions. Static stress drop predictions based on the model agree reasonably well with estimates from seismic observations. Our results may help explain the discrepancy between laboratory-derived rate-and-state friction parameter values, obtained for dry, low-strain and/or single-phase rock systems, and the values for natural fault rocks inferred from seismological data.Citation: Niemeijer, A. R., and C. J. Spiers (2007), A microphysical model for strong velocity weakening in phyllosilicate-bearing fault gouges,

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Section: Microstructural Model and Associated State Variablesmentioning

confidence: 99%

A microphysical model for strong velocity weakening in phyllosilicate‐bearing fault gouges

2007

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“…In general, there are di erent numerical approaches for analysis of the lateral bearing capacity of a single pile [15]. One approach is to establish the pile-soil model based on the lateral pile-soil interaction.…”

Section: Numerical Modelingmentioning

confidence: 99%

Calculation Approach for Lateral Bearing Capacity of Single Precast Concrete Piles with Improved Soil Surrounds

Wang

et al. 2018

Advances in Civil Engineering

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Precast concrete (PC) piles with cement-improved soil surrounds have been widely used for soft ground improvement. However, very few calculation approaches have been proposed to predict the lateral bearing capacity. is study aims at investigating the lateral capacity of a single PC pile reinforced with cement-improved soil through a series of 3D finite element analyses and theoretical studies. It is revealed that application of cement-improved soil around the PC pile can obviously reduce the induced lateral deflections and bending moments in the pile and can significantly increase its capacity to resist lateral loading. To account for the reinforcement effect of cement-treated soil, a modified m approach is proposed by introducing a modified coefficient to enable the predictions of the lateral bearing capacity for such reinforced PC piles. It is revealed that the modified coefficient is approximately linearly related to the compressive bearing capacity of improved soil surrounds.

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“…Compared to conventional piles, they may undergo severe reduction in horizontal bearing behavior. Although conventional laterally loaded piles have been studied by many researchers [9][10][11][12][13][14][15], limited literature can be found for piles in sloping ground [16][17][18][19][20][21][22][23]. In the past, the lateral behavior of piles could be evaluated with assumed earth pressure distribution, which can also be determined from field or model tests.…”

Section: Introductionmentioning

confidence: 99%

A Simplified Nonlinear Method for a Laterally Loaded Pile in Sloping Ground

Peng

Yang

2018

Advances in Civil Engineering

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A simplified nonlinear method was proposed to evaluate lateral behavior of a pile located in or nearby a slope, based on the traditional p-y method. is method was validated with field test results of a steel pipe pile in clay and model tests of piles in sand slopes. e comparison indicated that the calculated horizontal displacement and bending moment of piles agree well with experimental results. en, parametric studies were performed, and it shows that horizontal displacement, rotation, bending moment, and shear force increase along with increasing slope angles; the depth of maximum moment locates at about 1.6 D below ground surface for horizontal ground, while this value turns to be about 3.6 D and 5.6 D for sloping ground of 30°and 60°, respectively. e study clearly shows that slope angle has a significant effect on the deflection and lateral capacity of piles.

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Numerical analysis of pile behaviour under lateral loads in layered elastic–plastic soils

Cited by 126 publications

References 11 publications

A microphysical model for strong velocity weakening in phyllosilicate‐bearing fault gouges

A microphysical model for strong velocity weakening in phyllosilicate‐bearing fault gouges

Calculation Approach for Lateral Bearing Capacity of Single Precast Concrete Piles with Improved Soil Surrounds

A Simplified Nonlinear Method for a Laterally Loaded Pile in Sloping Ground

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