Bearing capacity of ring foundation due to various loading positions by finite element limit analysis

Vali, Ramin; Beygi, Majid; Saberian, Mohammad; Li, Jie

doi:10.1016/j.compgeo.2019.02.020

Cited by 28 publications

(3 citation statements)

References 15 publications

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“…When applied to a shallow foundation, this condition is identified as the post peak in the force-displacements curve [37,56] or when the shear band below the foundation is completely formed [57][58][59]. Similar cases on soil dams' foundation are reported in [60][61][62][63].…”

Section: Rpe Structural Collapse Definitionmentioning

confidence: 75%

Numerical Simulation of Rockfall Protection Embankments in Natural Soil

Vigna,

Marchelli,

De Biagi

et al. 2023

Geosciences

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Rockfall events represent a significant hazard in mountainous regions, putting human safety and critical infrastructure at risk. Various mitigation devices are available, among which, Rockfall protection embankments (RPEs) located in natural soil are passive defense work suitable for high-energy and high-frequency events. Currently, limited research has been conducted in this area, with the Austrian standard ONR 24810 providing the sole codified design method. A parametrical analysis involving both the RPE geometry and the impact features was developed by Abaqus/Explicit FEM code, with 2270 cases overall. The research aims to identify conditions under which RPEs effectively stop falling blocks, focusing on two failure mechanisms: the block pass over the RPE after impacting the upstream side bank and the RPE structural collapse. Additionally, the interaction between RPEs and their foundations during the impact is explored. The results provide valuable insights into the dynamic behavior of these structures. In terms of design considerations, this study offers analytical equations to quantify crater depth and foundation stress induced by the impact. Furthermore, design charts are developed to assess the block passing over verification and the structural collapse verification.

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Section: Rpe Structural Collapse Definitionmentioning

confidence: 75%

Numerical Simulation of Rockfall Protection Embankments in Natural Soil

Vigna,

Marchelli,

De Biagi

et al. 2023

Geosciences

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“…This approach is broadly used in geotechnical engineering to solve stability problems [11,44] and ascertain the footing bearing capacity [18,[45][46][47][48]. Through the FELA method, which is a mixture of the finite element and the classical limit analysis of plasticity, lower and upper bounds on the ultimate bearing capacity of the foundation can be obtained.…”

Section: Size Of Void √ √ √mentioning

confidence: 99%

Machine Learning-Based Prediction of the Seismic Bearing Capacity of a Shallow Strip Footing over a Void in Heterogeneous Soils

et al. 2021

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The seismic bearing capacity of a shallow strip footing above a void displays a complex dependence on several characteristics, linked to geometric problems and to the soil properties. Hence, setting analytical models to estimate such bearing capacity is extremely challenging. In this work, machine learning (ML) techniques have been employed to predict the seismic bearing capacity of a shallow strip footing located over a single unsupported rectangular void in heterogeneous soil. A dataset consisting of 38,000 finite element limit analysis simulations has been created, and the mean value between the upper and lower bounds of the bearing capacity has been computed at the varying undrained shear strength and internal friction angle of the soil, horizontal earthquake accelerations, and position, shape, and size of the void. Three machine learning techniques have been adopted to learn the link between the aforementioned parameters and the bearing capacity: multilayer perceptron neural networks; a group method of data handling; and a combined adaptive-network-based fuzzy inference system and particle swarm optimization. The performances of these ML techniques have been compared with each other, in terms of the following statistical performance indices: coefficient of determination (); root mean square error (); mean absolute percentage error; scatter index; and standard bias. Results have shown that all the ML techniques perform well, though the multilayer perceptron has a slightly superior accuracy featuring noteworthy results (0.9955 and 0.0158).

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“…Using finite element limit analysis (FELA), Yang et al (2020) and Khatri et al (2017) were able to calculate the bearing capacity of ring footings on sand layer overlying clay soil and on loose sand deposit with dense inclusion at its top respectively. For frictional and cohesive soils, Vali et al (2019) also evaluated the bearing capacity values by (FELA). Benmebarek et al (2012Benmebarek et al ( , 2016 performed 2D finite difference analysis (FLAC 2D) to calculate on one hand the capacity factors 𝑁 𝛾 and on the other hand the effect of the ratio between the inner and external radius ri/r0 and the embedment depth on the factor 𝑁 𝑐 for smooth and rough ring footings.…”

Section: Introductionmentioning

confidence: 99%

Failure envelope and bearing capacity of a rigid ring footing on sand layer overlying stiff clay under eccentric loads

Kitchah

2024

Preprint

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In this paper, numerical calculations in axisymmetry based on the finite difference method are carried out to calculate the bearing capacity of a rigid ring footing on sand overlying stiff clay subjected to eccentric loading. The verification of the model accuracy is examined after an initial analysis by comparing the bearing capacity factor Nγ of a rough and smooth circular footing loaded vertically and placed on the surface of the soil. To show the effect of eccentricity, sand layer thickness and friction angle, the results are presented in graphs and normalized failure envelopes in the V-M loading plane. The results indicate on one hand that the eccentricity of the load has little effect on the reduction of the bearing capacity as long as this eccentricity remains less than the third of footing width, on the other hand, that the influence of the clay layer on the increase of the bearing capacity is negligible if the thickness of the sand layer exceeds twice of the footing width. Moreover, the friction angle makes a significant difference to the size of the standardized failure envelope.

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Bearing capacity of ring foundation due to various loading positions by finite element limit analysis

Cited by 28 publications

References 15 publications

Numerical Simulation of Rockfall Protection Embankments in Natural Soil

Numerical Simulation of Rockfall Protection Embankments in Natural Soil

Machine Learning-Based Prediction of the Seismic Bearing Capacity of a Shallow Strip Footing over a Void in Heterogeneous Soils

Failure envelope and bearing capacity of a rigid ring footing on sand layer overlying stiff clay under eccentric loads

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