Numerical Modeling of Cone Penetration Test in Unsaturated Sand inside a Calibration Chamber

Jarast, Pegah; Ghayoomi, Majid

doi:10.1061/(asce)gm.1943-5622.0001052

Cited by 16 publications

(9 citation statements)

References 36 publications

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“…Also, reports on the calibration of these models are inadequate in the literature. In addition, BBM is applied in the numerical studies of some former researchers [12][13][14]. Therefore, it is possible to validate the later numerical studies with the ones obtained previously.…”

Section: Discussionmentioning

confidence: 91%

“…BBM is implemented and used for all of the analyses performed in this study via FLAC program. Although this is a simple constitutive model for unsaturated soils, it has been widely used especially for fine-grained soils, excluding those containing highly expansive clay minerals [14]. In addition, in most of the pressuremeter tests in unsaturated soils available in the literature, only the BBM parameters have been reported, and therefore this constitutive model is employed in the numerical analyses of this study to validate the procedure with available measurements or numerical studies found in the literature.…”

Section: Materials Modelmentioning

confidence: 99%

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Pressuremeter test in unsaturated soils: a numerical study

Keshmiri

Ahmadi

2021

SN Appl. Sci.

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The paper presents a numerical analysis of pressuremeter test in unsaturated cohesive soils. In practice, pressuremeter is commonly expanded up to 10–15% cavity strains. At these strains, limit pressure is not usually reached, and its value is estimated by extrapolation. Accordingly, authors suggest using cavity pressure at 10% strain (P10) for the interpretation of pressuremeter test rather than limit pressure. At this strain, it is also assured that plastic strain occurs around the cavity, which is crucial for the interpretations. In unsaturated soils, the moisture at which a soil is tested has a noticeable influence on the pressuremeter cavity pressure, and consequently, on the magnitude of P10. In this paper, unsaturated soil behaviour has been captured by Barcelona basic model (BBM), and the influence of each BBM parameter on the P10 value is explored. Next, relative weight analysis technique is performed to investigate the relative importance of BBM parameters in prediction of P10. Artificial intelligence technique of genetic programming is used to develop a relationship to predict the P10 value in unsaturated soils from BBM parameters. Finally, the application of the proposed equation is shown through illustrative examples.

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Section: Discussionmentioning

confidence: 91%

Section: Materials Modelmentioning

confidence: 99%

Pressuremeter test in unsaturated soils: a numerical study

Keshmiri

Ahmadi

2021

SN Appl. Sci.

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“…These reasons justify the implementation of this model in the present study. Moreover, authors such as Jarast and Ghayoomi, 10 Pournaghiazar et al. 45 and Yang and Russell 46 showed that MCM modified for an unsaturated condition can estimate the tip resistance in unsaturated sands with reasonable precision.…”

Section: Materials Modelmentioning

confidence: 99%

“…In this regard, researchers have employed various approaches including empirical solution, strain path method, cavity expansion theory and bearing capacity theory to interpret the CPT results. Furthermore, various numerical methods including finite element method, 1–10 finite difference method, 11–13 discrete element method, 14–17 particle finite element method, 18–21 material point method 22–24 and smooth particle hydrodynamics 25 have been applied to study CPT. On the basis of the foregoing approaches, various authors have developed correlations linking cone tip resistance to the soil properties.…”

Section: Introductionmentioning

confidence: 99%

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Interpretation of CPT in unsaturated sands under drained conditions: A numerical study

Keshmiri

Ahmadi

2021

Num Anal Meth Geomechanics

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A finite difference‐based numerical model simulating the cone penetration process in unsaturated sands is presented. Mohr–Coulomb model (MCM) with simple modifications and Sun model (SM) were implemented to capture the unsaturated sand behaviour. It was shown that the cone tip resistance values resulting from the two models were fairly comparable. Predicted cone tip resistance values in dry, saturated and unsaturated sands using MCM were validated by the results of field and calibration chamber tests. Sensitivity analyses were performed, and the influence of parameters including relative density, mean effective stress and apparent cohesion due to suction on the tip resistance was investigated. Based on a large number of numerical analyses, a simple relationship was suggested to predict the cone tip resistance in dry, saturated and unsaturated sands. The accuracy of the proposed relationship was evaluated by a large database of Cone penetration test (CPT) results performed in various calibration chambers containing different sands. Finally, the applicability of the suggested equation in the estimation of the soil relative density and friction angle from CPT results was shown through useful and practical charts and illustrative examples.

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