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Special Issue "Advances in Geotechnical Engineering Ⅱ"

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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Earth Sciences and Geography".

Deadline for manuscript submissions: 31 July 2021.

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Prof. Gye-Chun Cho
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Korea Advanced Institute of Science and Technology, Department Civil and Environmental Engineering, 291 Daehak Ro, Daejeon 34141, South Korea
Interests: geotechnical engineering; energy geotechnology; bio-soil; rock excavation
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Prof. Dr. Ilhan Chang
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Department of Civil Systems Engineering, Ajou University, Suwon-si, Gyeonggi-do, 16499, South Korea
Interests: Geotechnical engineering; Ground improvement; Bio-soil; Sustainability
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Special Issue Information

Dear Colleagues,

Recently, we have been facing drastic climate change and the various geotechnical engineering issues that follow with it. Thus, environmentally friendly and sustainable development is now an inevitable challenge for civil and geotechnical engineers, with the world and society asking geotechnical engineering to provide solutions to cope with energy depletion, environmental pollution, land degradation, geohazards, and global warming. This Special Issue welcomes all types of contributions to resolve current challenges in geotechnical engineering, from fundamental research to practical implementation scales.

The aim of this Special Issue is to provide a source of Advances in Geotechnical Engineering that deal with conventional or new fields in geotechnical engineering, including development of new material/methods for sustainable geotechnical engineering practice, geoenvironmental topics and research, renewable energy sources, recent attempts in CO2 and waste reduction, soil erosion and land preservation, and new space (underground, offshore, and planetary) development related to geotechnical engineering.

Prof. Gye-Chun Cho
Prof. Ilhan Chang
Guest Editors

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

Geotechnical and geoenvironmental engineering
Greenhouse gases and climate change
Sustainability
Energy depletion and renewable energy
Geotechnical engineering hazards
Laboratory testing and field application methods
Ground improvement and geosynthetics
Wastes and recycling
Soil erosion and land degradation
Bio-mediated and bio-inspired geotechnical engineering
New space development

Published Papers (5 papers)

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Research

Open AccessArticle

A Novel Approach to the Analysis of the Soil Consolidation Problem by Using Non-Classical Rheological Schemes

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Appl. Sci. 2021, 11(5), 1980; https://doi.org/10.3390/app11051980 - 24 Feb 2021

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Abstract

The paper presents classical and non-classical rheological schemes used to formulate constitutive models of the one-dimensional consolidation problem. The authors paid special attention to the secondary consolidation effects in organic soils as well as the soil over-consolidation phenomenon. The systems of partial differential equations were formulated for every model and solved numerically to obtain settlement curves. Selected numerical results were compared with standard oedometer laboratory test data carried out by the authors on organic soil samples. Additionally, plasticity phenomenon and non-classical rheological elements were included in order to take into account soil over-consolidation behaviour in the one-dimensional settlement model. A new way of formulating constitutive equations for the soil skeleton and predicting the relationship between the effective stress and strain or void ratio was presented. Rheological structures provide a flexible tool for creating complex constitutive relationships of soil. Full article

(This article belongs to the Special Issue Advances in Geotechnical Engineering Ⅱ)

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Open AccessArticle

Use of Reservoir Sediments to Improve Engineering Properties of Dune Sand in Oman

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Appl. Sci. 2021, 11(4), 1620; https://doi.org/10.3390/app11041620 - 10 Feb 2021

Viewed by 330

Abstract

Managing sediments dredged from reservoirs of recharge dams is an environmental issue, however, these sediments can be an abundant and economical source of fine-grained fill soil. This experimental investigation quantifies the geotechnical properties of a reservoir sediment used to improve engineering properties of a poorly graded dune sand in Oman. The binary mixes were prepared with different percentages (5, 10, 20, 50, 75, 90, 95%) of sediment with sand. Laboratory tests such as gradation, consistency limits, compaction, and unconfined compression tests were performed to measure the engineering characteristics of the binary mixtures. The results showed that the maximum dry density increases up to a sediment content of 50% and then decreases with further increase in the sediment content. The optimum water content increases with the increase in sediment content from 17% for pure sand to 22.5% for pure sediment. The optimum moisture content shows a good correlation with the plastic limit of the binary mixture of sand and sediment. The unconfined compressive strength substantially increases with sediment content up to 75% and then decreases with further increase in the sediment content. The binary mixture of sand sediment is sensitive to moisture, however, the order of strength stability against moisture is dune sand mixed with 75, 50, and 20% sediments. The addition of sediment to dune sand improved the uniformity coefficient to some extent with an increase in the maximum and minimum void ratios as well. The elemental analysis of the sediment confirms that the material is non-contaminated and can be employed in geotechnical engineering applications as a sustainable and environmentally friendly solution. Full article

(This article belongs to the Special Issue Advances in Geotechnical Engineering Ⅱ)

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Open AccessArticle

One-Dimensional Consolidation of Viscoelastic Soils Incorporating Caputo-Fabrizio Fractional Derivative

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Appl. Sci. 2021, 11(3), 927; https://doi.org/10.3390/app11030927 - 20 Jan 2021

Cited by 1 | Viewed by 267

Abstract

In this paper, the Caputo-Fabrizio fractional derivative is introduced to investigate the one-dimensional consolidation behavior of viscoelastic soils. Using the Caputo-Fabrizio operator, a novel four-element fractional-derivative model is proposed to capture the viscoelastic properties of the soils, and further the one-dimensional consolidation equation is derived to simulate the consolidation behavior of the soils. Using the techniques of eigenfunction expansion and Laplace transform, a series of analytical solutions are derived to calculate the excess pore-water pressure and the average degree of consolidation of the soils. The total vertical stress in the soil is assumed to change linearly with depth, and its distribution patterns are classified to rectangular pattern, trapezoidal pattern and inverse trapezoidal pattern. Four loading types including instantaneous loading, ramp loading, sinusoidal loading and general cyclic loading are considered. Then, a comparison for several special cases is presented to verify the correctness of the proposed solutions through comparing with existing theories. Moreover, two examples considering ramp and sinusoidal loadings are given to study the consolidation behavior of the viscoelastic soils incorporating the Caputo-Fabrizio fractional derivative. Full article

(This article belongs to the Special Issue Advances in Geotechnical Engineering Ⅱ)

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Open AccessArticle

One-Dimensional Consolidation of Multi-Layered Unsaturated Soil with Impeded Drainage Boundaries

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Appl. Sci. 2021, 11(1), 133; https://doi.org/10.3390/app11010133 - 25 Dec 2020

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Abstract

In geotechnical engineering, the consolidation of unsaturated soil is a common issue of great interest. Considering the multi-layered property and impeded drainage boundary condition of the soil stratum in real engineering, this study aimed to develop a general semi-analytical solution for assessing the one-dimensional (1D) consolidation behavior of multi-layered unsaturated soil that is subjected to a general impeded drainage boundary condition and a time-dependent loading. To achieve the final solution, the proposed consolidation system is firstly decoupled and solved in the Laplace domain. Then, the semi-analytical solutions for the excess pore-air pressure and excess pore-water pressures as well as the soil settlement are formulated. The Crump method is employed to provide their final results in the time domain. The correctness of the derived solutions was verified against the available analytical and numerical solutions, and excellent agreements were found for the two comparisons. Moreover, two studied examples are presented to illustrate the 1D consolidation behavior of multi-layered unsaturated soil and the influences stemming from the impeded drainage parameters are discussed. Full article

(This article belongs to the Special Issue Advances in Geotechnical Engineering Ⅱ)

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Open AccessArticle

An Integrated Approach to Real-Time Acoustic Emission Damage Source Localization in Piled Raft Foundations

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Appl. Sci. 2020, 10(23), 8727; https://doi.org/10.3390/app10238727 - 05 Dec 2020

Viewed by 466

Abstract

Acoustic emission (AE) has garnered significant interest as a promising way to detect the early-stage development of internal cracks and damage in underground and geotechnical structures, associated with natural disasters. Meanwhile, AE source localization techniques that can identify the damage location in a piled-raft foundation (PRF) are premature because of its complex geometry, although the PRF is a widely used deep foundation type for high-rise buildings. In this study, we propose an integrated approach to localize AE sources in the PRF by using the modified Akaike information criterion (AIC) method and examine its accuracy to mark with pile zones. We performed a series of experiments on a scaled PRF model at a ratio of 1:50, composed of one raft and 25 piles. The results demonstrate that the combined approach with the modified AIC method and the Simplex method can localize the AE source zones with good accuracy, greater than 95% on average. The suggested two-stage AIC picker shows accurate onset time determination, and hence, it significantly improves the accuracy, particularly effective for the signals with low signal-to-noise ratios. The approach exploiting the two-stage AIC picker can be readily used for automated real-time AE monitoring to detect crack generation and its location in buried foundations that cannot be inspected visually. Full article

(This article belongs to the Special Issue Advances in Geotechnical Engineering Ⅱ)

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