<abstract xmlns="http://www.w3.org/1999/xhtml">

This study evaluates various methods for estimating soil permeability using microtomography-derived data and compares them to the conventional laboratory approaches. Different methods, including measurement in custom-designed permeameter at micro-CT-compatible scale, empirical equations, simulated sifting, semi-theoretical equations, pore-network modeling, and lattice-Boltzmann simulations, were applied to samples of sandy soils with distinct microstructural properties. The empirical equations showed varied results, highly dependent on the method chosen. The simulated sifting method was able to adequately estimate the granulometric properties of the soil, allowing the use of empirical permeability formulations for substantially small samples. Semi-theoretical equations based on the microstructural properties presented reasonable agreement for some samples. The pore-network modeling approach demonstrated computational efficiency but lacked accuracy. The lattice-Boltzmann method required significant computational resources but did not provide substantially closer alignment with the measured hydraulic properties of some samples. None of the simulations was able to properly determine the permeability of silty and organically contaminated sand. The study highlights the complexity of permeability estimation, emphasizing the need for choosing volumes of interest, resolution of micro-CT scans, and methods that match specific soil characteristics and available computational resources.
</abstract>

Wrocław University of Science and Technology

Insights Into Estimation of Sand Permeability: From Empirical Relations to Microstructure-based Methods

<abstract xmlns="http://www.w3.org/1999/xhtml">

Rafts are frequently used to design foundations on soft soils to minimize the overall and differential settlements of structures built on them. In many cases, the raft alone can offer sufficient bearing capacity and all that is needed to restrict foundation settlements to a predetermined level with a few widely spaced piles. Granular piles (GPs) can be used due to their several advantages over steel or concrete piles. An annular raft foundation is generally provided for overhead water tanks, chimneys, etc. The provision of granular piles underneath the annular raft foundation not only increases the capacity of the foundation but also minimizes the settlement to an acceptable level. The present study deals with a rigorous analysis of annular raft foundation supported by GPs based on the continuum approach. A new numerical method is developed with geometric considerations for excluding the loaded pile portion from the region of the raft area by considering two distinct zones. This article introduces a novel approach, the annular raft over granular piles, which represents an innovative solution in geotechnical engineering. This innovation has the potential to improve the efficiency and effectiveness of foundation design in various construction projects. The response of annular raft foundation with GPs is evaluated in terms of settlement influence factor (SIF), load shared by granular piles (in %), and normalized shear stress variation along the GP–soil interface. The present study reveals that the presence of the pile influences the stress distribution locally. The stiffness of GP, relative length of GP, relative size of the raft influence the settlement and load sharing of annular raft with GPs.
</abstract>

Rajasthan Technical University, University Department

Jawaharlal Nehru Technological University & I.I.T.

An Analytical Study of Annular Raft on Granular Piles

<abstract xmlns="http://www.w3.org/1999/xhtml">

This paper explores the impact of height ratios on the seismic Structure-Soil-Structure Interaction (SSSI) for three adjacent bridges with varying superstructure masses (Mst = 350, 1050, 350 t) through 3D numerical simulations. A comprehensive series of numerical analyses has been conducted across different height ratios (R = 1, 1.1, 1.15, 1.2, 1.25, 1.5, 2, and 3) to assess their influence on superstructure acceleration and the internal forces within the foundation piles. The bridges under investigation are supported by groups of piles embedded in nonlinear clay. The numerical simulations were executed using fast Lagrangian analysis of continua in three dimensions (FLAC 3D), a three-dimensional finite differences modeling software. The findings revealed that variations in mass ratios significantly impact the SSSI effects on superstructure acceleration and pile internal forces. Notably, adverse effects were more pronounced for mass ratios of R = 1.1 and 1.2, leading to an increase in bending moment, shear force, and superstructure acceleration by up to 237.8%, 291.4%, and 70.33%, respectively. In contrast, a mass ratio of R = 3 resulted in a decrease in bending moment, shear force, and superstructure acceleration by up to 72%, 82.14%, and 81.13%, respectively. This implies that a careful arrangement of adjacent structures with different masses can be employed effectively to manage the (SSSI) effects.
</abstract>

Seismic Structure-Soil-Structure Interaction (SSSI) between piled neighboring bridges: Influence of height ratio

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Studia Geotechnica et Mechanica

 An international journal ‘Studia Geotechnica et Mechanica’ covers new developments in the broad areas of geomechanics as well as structural mechanics. The journal welcomes contributions dealing with original theoretical, numerical as well as experimental work. The following topics are of special interest:   Constitutive relations for geomaterials (soils, rocks, concrete, etc.)  Modeling of mechanical behaviour of heterogeneous materials at different scales  Analysis of coupled thermo-hydro-chemo-mechanical problems  Modeling of instabilities and localized deformation  Experimental investigations of material properties at different scales  Numerical algorithms: formulation and performance  Application of numerical techniques to analysis of problems involving foundations, underground structures, slopes and embankment  Risk and reliability analysis  Analysis of concrete and masonry structures  Modeling of case histories  Rejection Rate:   40%   Archiving Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process.    The journal Studia Geotechnica et Mechanica, in years 2017-2018, received funding for the following tasks:   Increase of foreign reviewers participation in the evaluation of the published content of Studia Geotechnica et Mechanica journal - financed under the agreement no. 602/P-DUN/2017 from the Ministry of Science and Higher Education funds for the Activity for Popularising Science.  Raising the quality of the published content in Studia Geotechnica et Mechanica journal - financed under the agreement no. 602/P-DUN/2017 from the Ministry of Science and Higher Education funds for the Activity for Popularising Science.    

Studia Geotechnica et Mechanica

Volume 46 (2024): Issue 1 (March 2024)

Original Study

Insights Into Estimation of Sand Permeability: From Empirical Relations to Microstructure-based Methods

An Analytical Study of Annular Raft on Granular Piles

Seismic Structure-Soil-Structure Interaction (SSSI) between piled neighboring bridges: Influence of height ratio

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