Analysis and design of geotechnical structures

Fernandes, Manuel Matos

doi:10.1201/9780429398452

Cited by 9 publications

(8 citation statements)

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“…Despite its wide use, Bjerrum's theory is faced with certain limitations as it predicts a compression increasing indefinitely with time under a constant effective stress, in contradiction with actual behavior that secondary consolidation does not persist indefinitely 55,56 . Furthermore, an “anomalous” behavior has been reported for some soils in which the secondary compression exhibits a nonlinear relation in the form of an S‐shaped curve with logarithm of time 55–58 …”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, an "anomalous" behavior has been reported for some soils in which the secondary compression exhibits a nonlinear relation in the form of an S-shaped curve with logarithm of time. [55][56][57][58] The mechanisms underlying the secondary compression is not yet well understood. Several theories include the fact that it arises from the viscous interaction of the solid surface with the adsorbed water, [59][60][61] and/or interparticle sliding or rotation that evolves with time, 62,63 and/or physico-chemical interaction of the electric double layers formed on the clay particles.…”

Section: Introductionmentioning

confidence: 99%

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Time scales in the primary and secondary compression of soils

Liu

Borja

2022

Num Anal Meth Geomechanics

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The last several decades have seen a surge of papers dealing with analytical and semi‐analytical solutions to the problem of one‐dimensional consolidation of soils. But rarely has any of these contributions focused on the time scales arising from combined primary and secondary compression. Primary compression has always been attributed to the dissipation of excess pore pressure as fluid is expelled from the soil skeleton to the drainage boundaries. However, there have been several schools of thought when it comes to the process governing the secondary compression. In this paper, we attribute the secondary compression to any of the following processes occurring either individually or in combination: (a) rate‐dependent (viscoplastic) constitutive response of the soil skeleton; (b) existence of a secondary pore scale system that expels fluid from the smaller‐scale pores to the larger‐scale pores; and (c) delayed compression due to creep following Bjerrum's concept of secondary consolidation. Contributions of the present work include closed‐form analytical solutions to the problem of combined primary and secondary compression of soils in one dimension, as well as a quantitative analysis of the time scales involved in such coupled hydromechanical processes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Time scales in the primary and secondary compression of soils

Liu

Borja

2022

Num Anal Meth Geomechanics

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“…It is worth to notice that, for a given depth, effective at-rest stress may range in a given interval, depending on the position of the water table. For the areas where the majority of the results was obtained, the values of the median of the depth of the water table is in the range 4.0-5.0 m [43,44]. The results above the upper limit line from pressuremeter tests at shallower depths might probably correspond to tests performed above the water table suffering the influence of suction [42].…”

Section: Discussionmentioning

confidence: 99%

Undrained shear strength of Lisbon Miocene clay: a reappraisal based on triaxial and pressuremeter test results

Laranjo

Fernandes

2021

SN Appl. Sci.

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Undrained shear strength plays a fundamental role on the behaviour of clays. In overconsolidated clays, this parameter is largely influenced by test conditions, namely consolidation stress. “Prazeres Clay” is a Miocene overconsolidated formation, that can be found in a significant part of Lisbon area. Over the last decades a number of very relevant constructions have generated a large database for physical and mechanical properties of Miocene clays. Included in a broader study at the Faculty of Engineering of Porto University about Miocene clay’s physical and mechanical properties, existing data was gathered, treated and critically analysed, in order to establish a useful framework for geotechnical designers. This paper presents the results obtained for undrained shear strength, obtained from triaxial tests and Ménard Pressuremeter tests. It addresses the main difficulties associated with test’s interpretation and presents a discussion on how theoretical values relate to experimental ones. The paper proposes a range of variation for Prazeres Clay’ undrained shear strength based on a significant amount of test results, that is considered to be useful for geotechnical design. Article Highlights Undrained Shear strength is a relevant parameter for clays, and is usually derived from triaxial tests For overconsolidated clays, this parameter is highly dependent on preconsolidation stress, and on its relation to in situ stress. Based on a significant set of data, the paper presents a simple methodology for estimating this parameter

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“…Over this period, a growing number of solutions emerged, with different materials and construction techniques. Given the broad range of solutions, a possible way to classify piles is based on their installation method, whereby piles are usually classified into two categories: displacement and non-displacement piles [11]. Pre-fabricated driven piles are included in the first category, which is characterized by the occurrence of soil movements to allow for the penetration of the pile into the ground, without the need for prior removal of the soil, which characterizes the second category.…”

Section: Introductionmentioning

confidence: 99%

Empirical, Experimental and Numerical Prediction of Ground-Borne Vibrations Induced by Impact Pile Driving

2022

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The automatization of construction activities, which aims to reduce the time and cost of constructions, makes impact pile driving an interesting technique. However, these activities in urban areas can generate excessive vibrations and interfere with people and structures in the vicinity. With that in mind, predicting the expected vibration levels during the project design stage is essential. Different methodologies can be employed in this task, from empirical approaches to detailed and complex numerical formulations. This paper intends to present an overview of the empirical methods and the main physics of the problem from a numerical point of view. The results obtained are then compared with experimental vibration data reported in the literature in order to discuss the adequacy of empirical and numerical methodologies in predicting ground-borne vibrations induced by impact pile driving.

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Analysis and design of geotechnical structures

Cited by 9 publications

References 0 publications

Time scales in the primary and secondary compression of soils

Time scales in the primary and secondary compression of soils

Undrained shear strength of Lisbon Miocene clay: a reappraisal based on triaxial and pressuremeter test results

Empirical, Experimental and Numerical Prediction of Ground-Borne Vibrations Induced by Impact Pile Driving

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