Analysis of cone penetration in brittle liquefiable soils

Monforte, Lluís; Gens, Antonio; Arroyo, Marcos; Mánica, Miguel A.; Carbonell, Josep Maria

doi:10.1016/j.compgeo.2021.104123

Cited by 21 publications

(12 citation statements)

References 64 publications

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“…State and parameter identification may be also facilitated by realistic simulation of CPTu penetration with CASM, something now possible with advanced numerical technology (e.g. Monforte et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Application of a critical state model to the Merriespruit tailings dam failure

Mánica

Arroyo

Gens

et al. 2022

Proceedings of the Institution of Civil Engineers - Geotechnica

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The use of stress–deformation analyses to evaluate the characteristics of possible static liquefaction events is rapidly becoming the norm for tailings dams exposed to such risk. Ideally, those analyses should be based on constitutive models that incorporate the fundamental mechanics of the problem, are able to perform robustly in commercial numerical platforms and are simple to calibrate. A model that aims to fulfil that specification is proposed. The model is a new implementation of a previously proposed model based on critical state concepts that is able to represent static liquefaction. The model formulation is elaborated to show that all the required inputs can be related to familiar concepts such as the critical state line, the state parameter, the normalised undrained peak strength or the coefficient of earth pressure at rest. The methodology is illustrated by analysing the failure of the Merriespruit tailings dam, which occurred in South Africa in 1994 and was instrumental in the recognition of how widespread liquefaction risk might be in saturated tailings. Numerical analysis of the case showed how a large static liquefaction failure might have been triggered by a relatively small slope erosion caused by overtopping.

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Section: Discussionmentioning

confidence: 99%

Application of a critical state model to the Merriespruit tailings dam failure

Mánica

Arroyo

Gens

et al. 2022

Proceedings of the Institution of Civil Engineers - Geotechnica

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“…A numerical method able to model large-deformations is required for the analysis of pile installation processes. Simulations using the Coupled Eulerian-Lagrangian (CEL) method (Qiu et al, 2011;Henke, 2014;Hamann et al, 2015;Fan et al, 2021c;Bienen et al, 2021), the (Multi-Material) Arbitrary Lagrangian Eulerian method (Liyanapathirana, 2009;Tolooiyan and Gavin, 2011;Dijkstra et al, 2011;Aubram et al, 2015;Yang et al, 2020), the Material Point Method (Phuong et al, 2014;Hamad, 2016;Ceccato and Simonini, 2017;Giridharan et al, 2020;Martinelli and Galavi, 2021), the Particle FEM (Hauser and Schweiger, 2021;Monforte et al, 2021;Zhang et al, 2021), the Discrete Element Method (Ciantia et al, 2016;Li et al, 2019) and the Smoothed Particle Hydrodynamics method (Cyril et al, 2019) are reported in the literature. A discussion of the different methods as well as of their advantages and disadvantages in applications to geotechnical boundary value problems is out of the scope of this work.…”

Section: Numerical Simulation Of the Installation Processmentioning

confidence: 99%

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

Staubach

Macháček

Bienen

et al. 2022

J. Geotech. Geoenviron. Eng.

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The influence of the pile installation by vibratory or impact driving on the response to subsequent cyclic lateral loading, as faced in the offshore environment, is investigated numerically. Largedeformation analyses of the pile installation process using the Coupled Eulerian-Lagrangian method considering partially drained conditions are performed. Following the installation, one million lateral load cycles are simulated using the high-cycle accumulation (HCA) model. The lower the hydraulic conductivity of the soil during driving, the higher the accumulation of lateral deformation when the pile is subjected to high-cyclic loading. The assumption of ideally drained conditions during pile driving results in a lower accumulation, in particular for the vibratory driven pile. Compared to the influence of the drainage conditions during driving, the influence of the installation method is found to be of less importance. While the vibratory driven piles tend to give less resistance to monotonic lateral loading for most conditions, slightly lower permanent pile head rotations after one million lateral loading cycles are observed compared to the impact driven piles.

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“…The nodes of the spa tial discretization -performed with low-order linear triangles or tetrahedra -are treated as material par ticles, the motion of which is tracked during the numerical simulation. Applications of PFEM to the modeling of CPTu tests have been reported, e.g., by Monforte et al (2017), Monforte et al (2018), Monforte et al (2021), Hauser and Schweiger (2021) and Carbonell et al (2022).…”

Section: Introductionmentioning

confidence: 99%

PFEM modeling of CPTu tests in saturated structured soils

Oliynyk¹,

Ciantia²,

Tamagnini³

2022

Cone Penetration Testing 2022

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The conventional interpretation of CPTu tests is typically based on empirical and semi-empirical correlations based on very crude descriptions of soil behavior, such as the total stress approach coupled with the Terzaghi-Rendulic pseudo-3d consolidation theory for modeling the time evolution of excess pore water pressure. The aim of this work is to show that a more rational interpretation of the coupled deformation and flow processes occurring in the soil during a CPTu test is possible by resorting to the numerical solution of the relevant governing equations, incorporating a realistic constitutive model for the soil. In order to deal with the large displacements and deformations induced by the cone penetration, the Particle Finite Element Method code G-PFEM, recently developed for geomechanical applications, has been used for this purpose. A key feature of the present work is the use of a finite deformation version of a non-associative isotropic hardening plasticity model for structured geoma terials -the FD_Milan model. The model is equipped with a structure-related internal variable which provide a macroscopic description of the effects of structure in natural, fine-grained soils. In order to deal with strain local ization, typically observed in structured geomaterials upon yielding, the model has been equipped with a non-local version of the hardening laws, which has demonstrated capable of regularizing the pathological mesh dependence of classical FE solutions in the post-localization regime. A number of PFEM simulations of CPTu tests on a soft structured natural clay has been performed in order to assess the effects of the initial bond strength and permeabil ity on the predicted results of the test, as well as on the spatial distributions of accumulated plastic strains, internal variables and excess pore water pressures. The results obtained represent a promising step towards a more rational interpretation of the CPTu tests in structured geomaterials and for their use in the calibration of advanced soil models.

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Analysis of cone penetration in brittle liquefiable soils

Cited by 21 publications

References 64 publications

Application of a critical state model to the Merriespruit tailings dam failure

Application of a critical state model to the Merriespruit tailings dam failure

Long-Term Response of Piles to Cyclic Lateral Loading Following Vibratory and Impact Driving in Water-Saturated Sand

PFEM modeling of CPTu tests in saturated structured soils

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