The elastic undrained modulus E<sub>u50</sub> for stiff consolidated clays related to the concept of stress history and normalized soil properties

Stróżyk, J.; Tankiewicz, Matylda

doi:10.1515/sgem-2016-0025

Cited by 17 publications

(4 citation statements)

References 15 publications

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“…is constant, the effective vertical stress being 0.83 (this value appears to be coherent with values reported in [41]). Evaluating ′ v0 at different depths, a c u value corresponding to this depth can be calculated, so introducing a linear variation with depth; being E u depending on c u , a variation of Young's modulus is consequently considered.…”

Section: Definition Of Materials and Interface Parameters For The Numesupporting

confidence: 88%

Analysis of the Behaviour of Very Slender Piles: Focus on the Ultimate Load

Gatto

Montrasio

2020

Int J Civ Eng

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The paper aims to analyse the influence of slenderness on the ultimate behaviour of piles with a very small diameter (less than 10 cm) that are often employed in soil reinforcement and for which the slenderness can significatively influence the failure behaviour, reducing the ultimate load. The aim is reached by means of numerical analyses on small-diameter piles of different geometries, embedded in clayey soil. The critical load is evaluated numerically in undrained conditions and then compared to the bearing capacity estimated by the classical approaches based on limit equilibrium method. The numerical model is first calibrated on the basis of the results of experimental laboratory tests on bored piles of a small diameter in a cohesive soft soil (average undrained shear strength c u = 15 kPa). The comparison between the critical load and the bearing capacity shows that their ratio becomes less than 1 for critical slenderness L CR that decreases, nonlinearly, with the decreasing of the pile diameter. The results of the analysis show that varying the diameter of the pile from 0.06 to 0.18 m, L CR varies from 65 to 200. The aforementioned evidence suggests that the evaluation of the ultimate load of piles of very small diameter has to follow the considerations on the critical load of the pile, especially if it is embedded in soft soil; on the contrary for piles of greater diameters (bigger than 20 cm) the buckling is not meaningful because L CR is so big that the common slenderness does not exceed it.

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Section: Definition Of Materials and Interface Parameters For The Numesupporting

confidence: 88%

Analysis of the Behaviour of Very Slender Piles: Focus on the Ultimate Load

Gatto

Montrasio

2020

Int J Civ Eng

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“…The procedure followed for the calculation of the critical strain limit ε c , where (a) specimen‐scale, (b) pixel‐scale (which depends on strain resolution), and (c) grain‐scale. 1 Stacey (), 2 Diederichs (), 3 Shirole et al (), 4 Sharma and Verma (), 5l Tang et al (), 6 Prat et al (), and 7 Stróżyk and Tankiewicz ().…”

Section: Resultsmentioning

confidence: 99%

Experimental Relationship Between Compressional Wave Attenuation and Surface Strains in Brittle Rock

2019

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Linear ultrasonic testing (LUT) has been extensively used as a tool for the evaluation of damage processes in various materials ranging from synthetic metals to natural geomaterials, such as rocks. A key limitation of LUT‐based damage studies to date is the lack of explicit evidence used in associating material damage with the changes in measured LUT attributes (e.g., ultrasonic wave amplitude and velocity). In this study, the evolution of the full‐field strains in brittle rock specimens (Lyons sandstone) subjected to failure are analyzed in real time and linked with the changes in the ultrasonic wave amplitude in localized areas illuminated by ultrasonic beams, termed as the ultrasonic image areas. The noncontact optical full‐field displacement measurement method of 2‐D digital image correlation is implemented in combination with the LUT procedure to continuously track changes in the ultrasonic wave amplitude with the evolution of strains across the surface of the uniaxially loaded intact rock specimens. The ultrasonic amplitude showed near‐linear correlation with the intensity of inelastic tensile strain recorded in the rock specimens. The results from the study corroborate that the ultrasonic changes are in fact influenced by the regions of tensile cracking, which is the primary inelastic deformation mechanism in brittle rocks.

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“…From stress–strain graph, E u50 parameter was obtained and was considered as the elastic modulus (Figure 3). 30 …”

Section: Test Procedures and Apparatusesmentioning

confidence: 99%

Experimental study of permeability and elastic modulus of plastic concrete containing nano silica

Farajzadehha

Mahdikhani

Moayed

et al. 2020

Structural Concrete

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Cut off walls are used under dams for the control of sub surfaces seepage and permeability of cut off wall was important. In the construction of cut off walls, plastic concrete is used and the amount of plastic concrete permeability is important. In this study, the permeability of plastic concrete was investigated and the effect of replacing nano silica instead of cement to reduce permeability was studied. So in this research, compressive strength, elastic modulus, and permeability parameters of plastic concrete specimens at different ages (7, 14, 28, and 56 days) and with different percentages of nano silica (0, 1.5, 3, 4.5, and 6%) were investigated. Also, scanning electron microscopy was used to investigate the effect of nano silica on plastic concrete specimens. The results show that as the age of the specimens increases, the compressive strength and elastic modulus increase, and the permeability of the plastic concrete decreases. Also, by adding nano silica to plastic concrete, the compressive strength of the plastic concrete increases and the plastic concrete permeability decreases significantly while its elastic modulus is almost constant.

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The elastic undrained modulus E_u50 for stiff consolidated clays related to the concept of stress history and normalized soil properties

Cited by 17 publications

References 15 publications

Analysis of the Behaviour of Very Slender Piles: Focus on the Ultimate Load

Analysis of the Behaviour of Very Slender Piles: Focus on the Ultimate Load

Experimental Relationship Between Compressional Wave Attenuation and Surface Strains in Brittle Rock

Experimental study of permeability and elastic modulus of plastic concrete containing nano silica

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The elastic undrained modulus Eu50 for stiff consolidated clays related to the concept of stress history and normalized soil properties

Cited by 17 publications

References 15 publications

Analysis of the Behaviour of Very Slender Piles: Focus on the Ultimate Load

Analysis of the Behaviour of Very Slender Piles: Focus on the Ultimate Load

Experimental Relationship Between Compressional Wave Attenuation and Surface Strains in Brittle Rock

Experimental study of permeability and elastic modulus of plastic concrete containing nano silica

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Product

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The elastic undrained modulus E_u50 for stiff consolidated clays related to the concept of stress history and normalized soil properties