Article
Engineering, Civil
Mohamed Hayek
Summary: This paper presents analytical solutions for one-dimensional nonlinear steady-state vertical flux through unsaturated soils, which are applicable to homogeneous soils and fit better with experimental data. The solutions are obtained using the Maclaurin series expansion technique, and show excellent agreements with numerical results.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Geological
G. M. Rotisciani, A. Desideri, A. Amorosi
Summary: The paper introduces a new single-surface elasto-plastic model for unsaturated cemented soils, focusing on the mechanical instabilities induced by plastic strain accumulation and changes in pore saturation. The constitutive equations are used to simulate geotechnical testing conditions and analyze results, proposing a stability criterion for failure conditions. The crucial role of state variables and model parameters on potential failure conditions is highlighted and validated against numerical results.
Article
Computer Science, Interdisciplinary Applications
Hassan Sabetamal, Daichao Sheng, John P. Carter
Summary: This paper presents a coupled hydro-mechanical modelling approach for unsaturated soil problems using advanced numerical and constitutive models in Abaqus. Two different strategies for interpreting unsaturated soil behaviour are considered, with relevant constitutive models implemented through user-defined subroutines. The algorithms are validated through benchmark problems and applied to simulate challenging unsaturated geomechanics problems, demonstrating the utility of the implemented procedures. Mesh optimization is also incorporated to handle finite deformations.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Xiaoqiang Li, Dechun Lu, Qingtao Lin, Xiaoqiang Dong, Xiuli Du
Summary: A hydro-mechanical constitutive model is proposed to describe the hydraulic and mechanical behavior of unsaturated soils. The model uses Bishop's effective stress and the effective degree of saturation as constitutive variables, and includes a loading-collapse yield curve and a non-orthogonal plastic flow rule. A simple water retention model is also developed. The model is validated through numerical examples and can capture the behavior of unsaturated soils.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Ana Sofia Dias, Marianna Pirone, Marco Valerio Nicotera, Gianfranco Urciuoli
Summary: This study proposed a method to obtain soil hydraulic characterization in unsaturated conditions on natural pyroclastic samples and verified its feasibility through experiments. The approach enables a full evaluation of soil hydraulic properties and the effects of hydraulic hysteresis, successfully describing the hysteretic behavior of pyroclastic soil under various conditions and paths.
Review
Geosciences, Multidisciplinary
Thomas J. Jones, Frances Beckett, Benjamin Bernard, Eric C. P. Breard, Fabio Dioguardi, Josef Dufek, Samantha Engwell, Julia Eychenne
Summary: This article emphasizes the importance of the physical properties of pyroclastic density current (PDC) deposits for hazard assessment and risk management. It discusses the challenges associated with measuring and characterizing these properties, as well as emerging topics and future research directions in the field.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Geological
Riccardo Scarfone, Simon J. Wheeler
Summary: At high saturation levels, the measured soil water retention curve in wetting tests can differ from the true curve due to air trapping. The true curve only reaches full saturation at a positive suction value. The most accurate way to represent air trapping is to use the true curve combined with a gas conductivity expression.
Article
Engineering, Geological
F. Behbehani, J. S. McCartney
Summary: This paper presents an experimental study on the hydromechanical behavior of unsaturated sedimented soil and investigates the impact of suction on apparent yield stress. The results demonstrate that an increase in suction leads to an increase in apparent yield stress. The compression curves for higher suctions show divergence without reaching pressurized saturation. When compared with compacted soils, sedimented soils exhibit a higher yield stress at saturated conditions but a similar increase in yield stress with suction, reflecting a more compact soil structure.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
He Chen, Shi-Jin Feng
Summary: This study develops a generalized constitutive model to describe hydraulic properties of soils considering soil heterogeneity and water distribution. The model assumes pore size distribution as a fractal characteristic and includes water retention curve, relative water permeability curve, and relative air permeability curve. Validation results show that the proposed model predicts relative water permeability and relative air permeability of unsaturated soils well. It also outperforms other models for most data sets. The influence of dual-porosity characteristic of structured soils on hydraulic properties is addressed.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Marianna Pirone, Rosa Di Maio, Giovanni Forte, Claudio De Paola, Emanuela Di Marino, Rosanna Salone, Antonio Santo, Gianfranco Urciuoli
Summary: This study proposes a multidisciplinary approach to investigate the role of local geological and geotechnical factors on the groundwater regime in slopes prone to flow-like landslides. By integrating geological, geophysical, and geotechnical investigations, the study provides insights into the hydraulic response of the soil cover to rainfall and its interaction with the underlying bedrock. The approach has been successfully applied to a test site in southern Italy, demonstrating its effectiveness.
ENGINEERING GEOLOGY
(2023)
Article
Mathematics, Interdisciplinary Applications
Yue Zhang, Annan Zhou, Majidreza Nazem, John Carter
Summary: This study introduces fully coupled global equations to enhance the performance of Finite Element analysis of unsaturated soils. The development of new global finite element equations provides an approximate solution to the governing equations, with a significant influence on the accuracy of numerical results for undrained footing problems by including an additional mechanical term in the flow matrix.
COMPUTATIONAL MECHANICS
(2021)
Article
Soil Science
Rui Chen, Jun-Wen Huang, Chao Zhou, Yang Ping, Zhong-Kui Chen
Summary: In this study, a new simple and low-cost air permeameter was developed to measure the air permeability in unsaturated soils, and it was found to be as reliable and accurate as the existing method proposed in ASTM D6539.
SOIL & TILLAGE RESEARCH
(2021)
Article
Engineering, Civil
Legchenko Anatoly, Baltassat Jean-Michel, Abbas Mohamad, Isch Arnaud, Amraoui Nadia, Azaroual Mohamed, Deparis Jacques, Ryckebusch Clemence, Kessouri Pauline
Summary: This paper presents an innovative hydrogeophysical approach for non-invasive quantification of unsaturated water flow. The method utilizes Magnetic Resonance Sounding (MRS) for water content measurements and employs time-lapse inversion to visualize variations in water content. The approach demonstrates good accuracy and reliability in experimental testing.
JOURNAL OF HYDROLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Xin Liu, Annan Zhou, Shui-Long Shen, Jie Li, Arul Arulrajah
Summary: The interface between unsaturated soil and structure is crucial in geotechnical structures, with the capillary cohesion effect changing non-monotonically with suction increase. As suction increases, capillary cohesion has a significant impact on the interface behavior, but this effect weakens with increasing normal stress.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Fred T. Tracy, Farshid Vahedifard
Summary: This paper presents an analytical solution for simulating water infiltration in unsaturated soils, taking into account the hydro-mechanical coupling and the effects of soil parameters. The solution can be used for site-specific or regional-scale analyses, and it serves as a benchmark for validating numerical methods.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Geological
Marco Valerio Nicotera, Raffaele Papa, Gianfranco Urciuoli
ENGINEERING GEOLOGY
(2015)
Article
Engineering, Geological
Brunella Balzano, Alessandro Tarantino, Marco Valerio Nicotera, Giovanni Forte, Melania de Falco, Antonio Santo
CANADIAN GEOTECHNICAL JOURNAL
(2019)
Article
Engineering, Geological
E. Vitale, D. Deneele, G. Russo, D. De Sarno, M. Nicotera, R. Papa, G. Urciuoli
Article
Engineering, Geological
Gianpiero Russo, Marco Valerio Nicotera, Silvia Autuori
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2019)
Article
Engineering, Geological
Giovanni Forte, Marianna Pirone, Antonio Santo, Marco Valerio Nicotera, Gianfranco Urciuoli
ENGINEERING GEOLOGY
(2019)
Article
Energy & Fuels
Ana Sofia Dias, Marianna Pirone, Marco Valerio Nicotera, Gianfranco Urciuoli
Summary: Flowslides and debris flows in granular soils are dangerous and can be triggered by rainfall. Accurate groundwater analysis is important for early warning systems to mitigate landslide risk. This paper presents a laboratory investigation on the hydraulic behavior of pyroclastic unsaturated deposits, highlighting the significance of hydraulic hysteresis and the presence of roots in shallow soils.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2022)
Article
Engineering, Geological
Ana Sofia Dias, Marianna Pirone, Marco Valerio Nicotera, Gianfranco Urciuoli
Summary: This study proposed a method to obtain soil hydraulic characterization in unsaturated conditions on natural pyroclastic samples and verified its feasibility through experiments. The approach enables a full evaluation of soil hydraulic properties and the effects of hydraulic hysteresis, successfully describing the hysteretic behavior of pyroclastic soil under various conditions and paths.
Article
Construction & Building Technology
Marco Valerio Nicotera, Gianpiero Russo
Summary: This study presents the construction process and monitoring results of the completion of the downtown stretch of Line 1 of the Napoli underground in Italy. It covers measurements of pore water pressures, displacement of retaining structures, ground anchor forces, temperature measurements, and subsidence of surrounding buildings. Valuable lessons are learned from the effectiveness of construction techniques and the relationships among different sets of measurements.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Gianpiero Russo, Marco Valerio Nicotera
Summary: This paper discusses the issue of soil movements around deep excavations in urban environments and presents various methods for predicting ground movements. It reviews existing 2D semi-empirical methods and modifies and combines them to develop a new 3D analytical description of the subsidence trough. The proposed method is validated through numerical simulations and real case studies in sand, demonstrating its effectiveness.
SCIENTIFIC REPORTS
(2022)
Proceedings Paper
Engineering, Environmental
Enza Vitale, Olivier Cuisinier, Giacomo Russo, Dimitri Deneele, Domenico De Sarno, Marco Valerio Nicotera, Raffaele Papa, Gianfranco Urciuoli
4TH EUROPEAN CONFERENCE ON UNSATURATED SOILS (E-UNSAT 2020)
(2020)
Article
Geosciences, Multidisciplinary
Marianna Pirone, Alfredo Reder, Guido Rianna, Luca Pagano, Marco Valerio Nicotera, Gianfranco Urciuoli
Proceedings Paper
Engineering, Geological
Marianna Pirone, Raffaele Papa, Marco Valerio Nicotera, Gianfranco Urciuoli
3RD EUROPEAN CONFERENCE ON UNSATURATED SOILS - E-UNSAT 2016
(2016)
Proceedings Paper
Engineering, Geological
Gianpiero Russo, Marco Valerio Nicotera, Silvia Autuori
ADVANCES IN TRANSPORTATION GEOTECHNICS III
(2016)
Proceedings Paper
Engineering, Geological
M. Pirone, R. Papa, M. V. Nicotera, G. Urciuoli
VOLCANIC ROCKS AND SOILS
(2016)
Proceedings Paper
Engineering, Geological
Marianna Pirone, Raffaele Papa, Marco Valerio Nicotera, Gianfranco Urciuoli
VI ITALIAN CONFERENCE OF RESEARCHERS IN GEOTECHNICAL ENGINEERING, CNRIG2016 - GEOTECHNICAL ENGINEERING IN MULTIDISCIPLINARY RESEARCH: FROM MICROSCALE TO REGIONAL SCALE
(2016)