Article
Geochemistry & Geophysics
Michael J. Heap, Gabriel G. Meyer, Corentin Noel, Fabian B. Wadsworth, Patrick Baud, Marie E. S. Violay
Summary: The permeability of volcanic rock can be measured in the brittle and ductile regimes, showing a relatively constant rate after shear fracture formation in the former and a continual decrease in the latter. The evolution of permeability in volcanic rock may improve volcano monitoring and hazard mitigation models.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Engineering, Geological
Ghassan Shahin, Athanasios Papazoglou, Ferdinando Marinelli, Gioacchino Viggiani, Giuseppe Buscarnera
Summary: This paper investigates the anisotropic behavior of a high-porosity carbonate rock and analyzes the influence of coring direction on yielding and compaction behavior. The results show that the coring direction has a significant impact on the mechanical response, but the strain localization mode is primarily affected by the confinement level. By introducing an elastoplastic constitutive law, the interaction between material anisotropy and compaction behavior is successfully captured.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Energy & Fuels
Jian-Tong Liu, Jian-Bo Wang, Hong-Kui Ge, Wei Zhou, Bei-Bei Chen, Xiao-Di Li, Xian-Jie Xue, Sen-Lin Luo
Summary: Due to the existence of gravel, the failure mode of glutenite is not only controlled by confining pressure, but also influenced by the gravel. The failure of glutenite is characterized by producing cracks around gravels, and the distribution patterns of cracks vary under different confining pressures.
Article
Geochemistry & Geophysics
Jin Hao, Guoliang Li, Jiao Su, Yuan Yuan, Zhongming Du, Suyun Niu, Jijin Yang
Summary: Digital rock physics is an emerging technique that relies on obtaining 3D rock structure images, accurately identifying 3D minerals, and using appropriate numerical simulation methods. A new workflow has been developed to obtain high-resolution digital rocks with 3D mineralogical information, offering the potential to explore elastic properties and heterogeneities at a millimeter scale in rocks like shales.
Article
Construction & Building Technology
Zhiqiang Cheng, De Zhang, Shengjia Xie, Pawel Polaczyk, Xiaoyang Jia, Tao Wang, Baoshan Huang, Ming Cai
Summary: In this study, a novel lab compaction method combining the effects of vibratory and gyratory compaction was proposed to better simulate the vibration and kneading effect of a steel-wheel roller. X-ray tomography was used to compare the air void distribution of in-situ core samples and laboratory-compacted samples by different compaction methods. The results showed that the combination of vibratory and gyratory compaction methods had a comparable air void distribution and compaction effect to the in-situ core samples.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Rui Kong, Ergun Tuncay, Resat Ulusay, Xiwei Zhang, Xia-Ting Feng
Summary: The study investigated the different failure characteristics of volcanic rock under high-stress conditions, revealing various failure modes under different stress states. It found that the rock exhibited unstable brittle failure under 1-D and 2-D compression, stable failure under axisymmetric triaxial stress, and localized shear failure under a three-dimensional differential stress state. The research also assessed the effect of sigma(2) on unstable failure based on energy release and cracking propagation.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Julia Leuthold, Eleni Gerolymatou, Theodoros Triantafyllidis
Summary: This paper evaluates the performance of a constitutive model for the hydro-mechanical behavior of soft rock and calibrates it using experimental results. An analytical model based on the Kozeny-Carman equation is proposed to describe the effect of compaction bands on the permeability of soft rocks and is discussed.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Mechanics
Kewang Cao, Liqiang Ma, Yu Wu, A. J. S. (Sam) Spearing, Naseer M. Khan, S. Hussain, Faheem Ur Rehman
Summary: This paper conducts infrared radiation observation experiments on dry and water saturated sandstone, studies the mechanical properties and infrared radiation characteristics during the fracture process of rocks, and establishes a rock constitutive model based on infrared radiation. The results show that water saturation weakens the mechanical properties of rocks but increases infrared radiation, and changes the failure mode of rocks. The established rock constitutive model can be used for stress prediction in both dry and saturated rocks.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Geochemistry & Geophysics
Mirko Siegert, Marcel Gurris, Maxim Lebedev, Erik H. Saenger
Summary: A new model for determining permeability in sandstones under confining pressure is presented, based on digital rock physics and derived from a 3D tomographic scan. The model simulates pressure-dependent behavior by adding artificial flow resistance to pore throats, and simulations are conducted using an in-house finite-volume code. The model is tested on a Bentheim sandstone sample and compared with experimental data, and the influence of factors such as tomographic scan and numerical resolution is investigated. Overall, the proposed model can replicate general trends of experimental data, but the magnitude of numerically determined permeabilities can vary depending on the influencing factors.
Article
Engineering, Geological
Liu He, Xudong Lu, Tim Copeland, Jiannan Chen, Jiaxin Yan, Wang Zhao
Summary: The shear rate has a significant impact on the shear mechanical properties of rock joints. This study conducted constant normal load direct shear tests on rock joint specimens under different shear rates to investigate their behavior and failure modes. The results showed that higher shear rates led to a decrease in peak shear strength, an increase in peak shear displacement, and a decrease in residual shear strength. The study also observed that increasing joint roughness coefficients and decreasing joint wall compressive strengths and normal stresses intensified the influence of shear rate on peak shear strength and peak shear displacement. Moreover, the research identified shear-off and wear failure modes, both of which were intensified by higher shear rates. However, as the shear rate increased, the dominant failure mode transitioned from wear to shear-off, especially when joint roughness coefficients, joint wall compressive strengths, and normal stresses decreased. Lastly, the study proposed a modified shear strength correlation model that incorporated shear rate and relevant variables to estimate the shear strength of rock joints. The predicted results demonstrated that the newly proposed model outperformed existing models.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Lauren N. Schaefer, Gabor Kereszturi, Ben M. Kennedy, Marlene Villeneuve
Summary: The geomechanical characterization of volcanic material is crucial for various applications, such as geothermal and mineral exploration, engineering design, and studying volcano unrest. In this study, the physical and mechanical properties of different volcanic rocks from Mount Ruapehu volcano in New Zealand were compared, and their mineralogical composition was analyzed. The results showed that porosity and primary lithology are the major factors controlling the physical and mechanical properties, followed by weathering/alteration and mineralogical composition. Additionally, hydrothermally altered rocks near the vent complex exhibited unique properties due to high clay content and low strength.
BULLETIN OF VOLCANOLOGY
(2023)
Article
Engineering, Geological
Julia Leuthold, Eleni Gerolymatou, Maximiliano R. Vergara, Theodoros Triantafyllidis
Summary: Experimental studies on soft porous rocks showed that discrete compaction bands form under high confining stresses, while shear bands form under low confining stresses. Axial permeability decreases with increasing axial strain, with a maximum permeability decrease of three orders of magnitude at 40% axial strain.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Energy & Fuels
Huajian Wang, Hualin Liao, Wenlong Niu, Yuhang He, Jiansheng Liu, Yongwang Liu
Summary: This study investigates the failure characteristics, penetration force, and failure mode of rocks with annular grooves under geostatic stress through numerical simulation. The results show that the presence of annular grooves can significantly reduce the penetration force and alter the failure mode of rocks. The annular grooves also decrease the radial force that restricts the expansion of rocks in the surrounding area.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Environmental
Tielin Han, Zhihui Li
Summary: In the study of rocks in cold regions, the mechanical characteristics of rock mass deformation failure and its behavior in actual environment are important subjects. The research found that with increasing freeze thawing cycles, the mechanical parameters of the sandstone deteriorated gradually. Additionally, the crack angle of inclinations had an influence on the deterioration damage of mechanical parameters.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Construction & Building Technology
Zhangyu Wu, Hongfa Yu, Haiyan Ma, Jinhua Zhang, Bo Da
Summary: This paper experimentally studied the physical and mechanical properties of coral aggregate (CA) in the South China Sea and quantitatively analyzed the pore characteristics using X-ray Computed Tomography technique. The study found that CA contains pores with different shapes and sizes, which are closely related to the coral growth environment. Additionally, the study proposed methods to improve the compressive toughness of CA. These findings have significant value for the study and application of CA in the South China Sea.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Civil
Matteo Oryem Ciantia, Riccardo Castellanza
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2016)
Article
Engineering, Geological
A. Pola, J. Martinez-Martinez, J. L. Macias, N. Fusi, G. Crosta, V. H. Garduno-Monroy, J. A. Nunez-Hurtado
ENGINEERING GEOLOGY
(2016)
Article
Engineering, Geological
Claudio di Prisco, Luca Flessati, Gabriele Frigerio, Riccardo Castellanza, Marco Caruso, Andrea Galli, Pietro Lunardi
Article
Environmental Sciences
J. Martinez-Martinez, A. Pola, L. Garcia-Sanchez, G. Reyes Agustin, L. S. Osorio Ocampo, J. L. Macias Vazquez, J. Robles-Camacho
ENVIRONMENTAL EARTH SCIENCES
(2018)
Article
Geosciences, Multidisciplinary
Susana Osorio-Ocampo, Jose Luis Macias, Antonio Pola, Silvestre Cardona-Melchor, Giovanni Sosa-Ceballos, Victor Hugo Garduno-Monroy, Paul W. Layer, Laura Garcia-Sanchez, Mathieu Perton, J. Benowitz
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2018)
Article
Engineering, Geological
Matteo O. Ciantia, Riccardo Castellanza, Jose A. Fernandez-Merodo
ROCK MECHANICS AND ROCK ENGINEERING
(2018)
Article
Construction & Building Technology
Riccardo Castellanza, Piernicola Lollino, Matteo Ciantia
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2018)
Article
Geography
Denis Ramon Avellan, Jose Luis Macias, Paul W. Layer, Guillermo Cisneros, Juan Manuel Sanchez-Nunez, Martha Gabriela Gomez-Vasconcelos, Antonio Pola, Giovanni Sosa-Ceballos, Felipe Garcia-Tenorio, Gabriela Reyes Agustin, Susana Osorio-Ocampo, Laura Garcia-Sanchez, Irma Fabiola Mendiola, Joan Marti, Hector Lopez-Loera, Jeff Benowitz
Article
Geography
L. Garcia Sanchez, J. L. Macias, R. Sulpizio, L. S. Osorio-Ocampo, C. Pellicioli, A. Pola, D. R. Avellan, G. Cisneros, F. Garcia, Y. Z. E. Ocampo-Diaz, R. M. Lira-Beltran, R. Saucedo, J. M. Sanchez-Nunez, J. L. Arce, P. Corona-Chavez, G. Reyes-Agustin, M. Cardona, P. W. Layer, J. Benowitz, L. Solari, G. Groppelli
Article
Geosciences, Multidisciplinary
R. Mollica, R. de Franco, G. Caielli, G. Boniolo, G. B. Crosta, A. Motti, A. Villa, R. Castellanza
JOURNAL OF APPLIED GEOPHYSICS
(2020)
Editorial Material
Engineering, Geological
Riccardo Castellanza
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Geological
Marco Previtali, Matteo Oryem Ciantia, Saverio Spadea, Riccardo Pietro Castellanza, Giovanni Battista Crosta
Summary: In this study, a discrete-element model was used to analyze a full-scale compound mesh barrier, revealing that impact position significantly affects the barrier response, particularly in terms of peak load and different loading modes.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Geological
Gisela Domej, Marco Previtali, Riccardo Castellanza, Daniele Spizzichino, Giovanni B. Crosta, Alberto Villa, Nicoletta Fusi, Mikheil Elashvili, Claudio Margottini
Summary: This study assesses the static stability of the artificial Sabereebi Cave Monastery in Georgia and presents a strategy to process point cloud data, turning it into high-resolution CAD models. The study explores various geomechanical scenarios using static elasto-plastic finite element stability models.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Proceedings Paper
Engineering, Civil
Davide Grassi, Giovanni Spagnoli, Riccardo Castellanza
Summary: This paper reports a laboratory study on a grouted cataclasite fragmented rock and its mechanical behavior. Two non-conventional binders, colloidal silica and hydrophilic acrylic resin, were tested and found to be effective in improving the mechanical properties of cataclasite.
GEO-CONGRESS 2022: SOIL IMPROVEMENT, GEOSYNTHETICS, AND INNOVATIVE GEOMATERIALS
(2022)
Proceedings Paper
Engineering, Civil
S. Utili, R. Castellanza, A. Galli, P. Sentenac
PROCEEDINGS OF THE INTERNATIONAL SCIENTIFIC CONFERENCE TRANSPORTATION GEOTECHNICS AND GEOECOLOGY (TGG-2017)
(2017)