Elasto-plastic analysis of the pressuremeter test in granular soil – part I: theory

Monnet, Jacques

doi:10.1080/19648189.2012.675171

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…The measurement of slope d (Figure 2) of the linear pressuremeter relationship between the logarithms of pressure and circumferential borehole deformation at the borehole wall is a function of only two mechanical parameters, the friction angle U 0 and the interparticle angle of friction U l , as shown in Equations (2) to (5) from Monnet (2012). The knowledge of δ and U l allows the determination of the angle of internal friction U 0 :…”

Section: Methods Used For the Determination Of Soil Parameters From Thmentioning

confidence: 99%

“…The value of U 0 is put into Equation (6) or (7) from Monnet (2012) to draw the theoretical pressuremeter curve, which is compared with the experimental one ( Figure 3). Equation (6) is related to an equilibrium with a vertical and horizontal plasticity and Equation (7) is related to only horizontal plasticity.…”

Section: Methods Used For the Determination Of Soil Parameters From Thmentioning

confidence: 99%

“…This value can be obtained by a direct theoretical and numerical analysis for an expansion of the pressuremeter probe, which is double the initial volume. The theoretical limit pressure equations are Equation (8) for horizontal and vertical plasticity, and Equation (9) for horizontal plasticity only (Monnet, 2012):…”

Section: Methods Used To Control the Theorymentioning

confidence: 99%

“…This avoids problems of grain size distribution and disturbance of the soil after sampling, often encountered in samples used for laboratory testing. In this paper, the finite element program Plaxis V.8 is used to calculate the limit pressure under different mechanical conditions and to compare it with the predicted value of the Monnet (2012) theory so that an estimation of the precision of the theory is possible.…”

Section: Introductionmentioning

confidence: 99%

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Elasto-plastic analysis of the pressuremeter test in granular soil – part 2: numerical study

Monnet

2012

European Journal of Environmental and Civil Engineering

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In the first paper, part 1, we presented the elasto-plastic theory for the expansion of the pressuremeter in granular soil. This theory allows determination of the behaviour of the granular soil around the pressuremeter with only four mechanical parameters. It is compared with previous theory on the dataset of the pressuremeter test on Ticino sand. In the second paper, part 2, we present the numerical analysis of the theoretical conventional limit pressure compared with the result of the MohrCoulomb non-standard model used by the Plaxis finite element program. The theoretical evolution of the conventional limit pressure as a function of the variation of each parameter shows a correct agreement with the numerical results. Conclusions are drawn on the influence of these parameters on the pressuremeter results.Dans un premier article, partie 1, nous présentons la théorie élasto-plastique de l'expansion de la sonde dans le sol granulaire. Cette théorie permet de déterminer le comportement du sol granulaire autour du pressiomètre avec seulement quatre paramètres mécaniques. Nous comparons ensuite ses résultats à ceux de théories plus anciennes pour l'étude des essais pressiométriques réalisés dans le sable de Ticino. Dans un second article, partie II, nous réalisons l'étude analytique de l'évolution de la pression limite donnée par cette théorie et nous la comparons à la valeur numéri-que trouvée avec le logiciel Plaxis L'évolution de la pression limite en fonction de la variation de chacun de ses paramètres montre un accord raisonnable avec les résultats numériques de Plaxis. Nous concluons sur l'importance relative de ces paramètres sur la pression limite

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Section: Methods Used For the Determination Of Soil Parameters From Thmentioning

confidence: 99%

Section: Methods Used For the Determination Of Soil Parameters From Thmentioning

confidence: 99%

Section: Methods Used To Control the Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elasto-plastic analysis of the pressuremeter test in granular soil – part 2: numerical study

Monnet

2012

European Journal of Environmental and Civil Engineering

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“…Mechanical characteristics of soils based on specific elastic-viscoplastic models of soils are defined in [1 -5] under static and dynamic loads in laboratory and field conditions. The complex laws of strain in soils and rocks [6][7][8][9][10], applied problems of destruction [11], a comparative analysis of mechanical characteristics determined by different methods [12], nonlinear models of soil strain [13 -18] and non-one-dimensional problems of seismic stability of earth structuresall these aspects require experimental data on mechanical characteristics of soils and rocks, especially when they are subjected to dynamic loads.…”

Section: Introductionmentioning

confidence: 99%

Wave processes in determining mechanical characteristics of soils

Sultanov

Loginov²,

Ismoilova³

et al. 2019

E3S Web Conf.

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Mechanical characteristics of soils under dynamic and static loads are determined in laboratory conditions on special devices. Dynamic loads in the devices are initiated by an impact on a soil sample. Under the impact the waves are initiated in soil; they significantly affect the stressstrain state of soil samples placed in the device. Depending on the parameters of the impact load in the device, in different sections of soil sample there arise the stress-strain states, different in quality and quantity. Mechanical characteristics of soil, determined by this stress-strain state, also differ. The effect of stress-strain state of soil on its mechanical characteristics can be estimated theoretically. The initiation of the wave process and dynamic stress-strain state in soil sample placed in the device can be theoretically examined in detail. In this regard, the wave problem is set, which corresponds to the statement of experiments on the device of dynamic loading of soil. The law of soil strain is taken as an elasticviscoplastic one. Numerical solution of wave equations is obtained by the finite difference method. Based on the analysis of stress-strain state of soil in various sections, obtained by numerical calculations, the condition is derived under which the effect of wave processes on mechanical characteristics of soils is eliminated. This condition (formula) establishes the relationship between the wavelength, the velocity of wave propagation in soil, the thickness of the soil sample in the device and the duration of dynamic load.

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2015

In Situ Tests in Geotechnical Engineering

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Elasto-plastic analysis of the pressuremeter test in granular soil – part I: theory

Cited by 7 publications

References 21 publications

Elasto-plastic analysis of the pressuremeter test in granular soil – part 2: numerical study

Elasto-plastic analysis of the pressuremeter test in granular soil – part 2: numerical study

Wave processes in determining mechanical characteristics of soils

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