Article
Computer Science, Interdisciplinary Applications
Xuejian Li, Kang Duan, Qiangyong Zhang, Jiarun Li, Rihua Jiang, Luchao Wang
Summary: The permeability of hydrocarbon reservoirs composed of porous rock is anisotropic under asymmetrical stress configuration. The permeability sensitivity of porous sandstone to stresses is investigated by experiments and simulations. An analytical model is proposed to calculate the components of tensorial permeability affected by stresses and evaluate the evolution of permeability anisotropy. The prediction of permeability sensitivity behaviors and anisotropy to stresses are consistent with experimental and simulated results.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Geochemistry & Geophysics
Hong-Ying Wang, Qiang Zhang
Summary: The study on yellow sandstones under low temperature conditions reveals that the properties such as secant modulus, compression strength, tensile strength, and peak strain do not change in perfect synchronization with temperature, showing a complex and varied influence of temperature on these properties.
Article
Physics, Multidisciplinary
Ning Zhang, Shuai Zhang, Jian-Jun Tan, Wei Zhang
Summary: This study investigates the correlation between force chains and friction mechanism during powder compaction in the field of powder metallurgy research. It reveals a strong correlation between the variation of friction coefficient and the evolution of force chains. The results also show that the friction coefficient eventually stabilizes during the compaction process and is closely related to the slip ratio between particles. The friction between particles and the side wall friction have an important effect on the direction of force chain growth.
Article
Construction & Building Technology
Guoqiang Liu, Dongdong Han, Yanshun Jia, Yongli Zhao
Summary: This study proposes new force chains identification criteria and skeleton main force chains (MFC) for evaluating asphalt mixture skeleton structure. The morphological characteristics of asphalt mixture MFC were analyzed using virtual bearing plate tests. The results indicate that stone mastic asphalt (SMA) and open-graded asphalt friction course (OGFC) have higher MFC number proportions and longer length MFC, while dense-graded asphalt concrete (AC) is easier to form a specific type of force chains. SMA has a smaller extension area under external loading, which improves the efficiency of external loading transfer.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Zack Tuckey
Summary: In the past decade, UAV Structure-from-Motion photogrammetry and digital rock mass mapping tools have been widely used in geotechnical engineering. This study presents a case study that applies UAV photogrammetry mapping, discrete fracture network analysis, and discrete element method modeling to investigate rock mass geomechanical characteristics. The results demonstrate the effectiveness and accuracy of these digital mapping and numerical modeling approaches.
ENGINEERING GEOLOGY
(2022)
Article
Construction & Building Technology
Guoqiang Liu, Dongdong Han, Cunzhen Zhu, Fengfeng Wang, Yongli Zhao
Summary: The study found that in asphalt mixtures, dense-graded asphalt mixtures generate more but shorter force chains compared to stone mastic asphalt and open-graded asphalt friction course, which are not conducive to transferring external loading. Additionally, asphalt mixtures with smaller nominal maximum aggregate size require more force chains to transfer external loading. Increasing the NMAS in asphalt mixtures can help form longer force chains.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Mechanics
Penghai Deng, Quansheng Liu, Xing Huang, Qi Liu, Hao Ma, Weiwei Li
Summary: The study proposed a method to measure the normal contact stiffness and found that an alpha value of 0.1448 is optimal for simulating rock crack propagation under different conditions. Proper selection of the alpha value can improve the reliability of FDEM numerical simulation results.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Huaiguang Xiao, Lei He, Jianchun Li, Chunjiang Zou, Chengmeng Shao
Summary: The digital twin modeling technology generates homologous and heterogeneous digital sandstone models based on a single two-dimensional image, showing similarity to CT reconstruction in morphology and parameters of porous media. This study proposes an accurate, stable, rapid, and cost-effective method for predicting the permeability of porous media.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Construction & Building Technology
Guoqiang Liu, Cunzhen Zhu, Dongdong Han, Yongli Zhao
Summary: Force chain morphological characteristics and bearing capacities can reflect the asphalt mixture's skeleton external loading transfer behaviour. Dense-graded asphalt concretes (AC) transfer external loading along the vertical direction, while stone mastic asphalt (SMA) and open-graded asphalt friction course (OGFC) have large expansion areas for force chains. Nominal maximum aggregate size (NMAS) has little influence on force chain alignment coefficient (FCAC) and force chain angle (FCA) distributions for AC, but it has stronger effects for SMA and OGFC. The passing percentage of sieve size 2.36 mm (P2.36) needs to be limited within a certain range to ensure better external loading transfer in asphalt mixtures.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Review
Engineering, Geological
Ali Keneti, Mehdi Pouragha, Bre-Anne Sainsbury
Summary: This study provides a comprehensive review of the geomechanical data for Hawkesbury Sandstone in the Sydney region, focusing on the strength-scale dependency. Large-scale, Synthetic Rock Mass (SRM) tests have been conducted to establish a strength-scale relationship that considers defect spacing, providing valuable insights for rock mass design.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Environmental
Qing Yu, Xiaohong He, Haoyu Miao, Minghua Lin, Kaixiang Zhang, Rui Guo
Summary: This study applied the MatDEM software to simulate and analyze the rock breaking mechanism of disc cutter in soil-rock formations. The results showed that the rock breaking effect of the disc cutter is related to the contact area between the rock and blade, the volume of broken rock, and the angle of contact area.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Computer Science, Interdisciplinary Applications
Haiyang Zhao, Liangchi Zhang, Zhonghuai Wu, Ang Liu
Summary: This paper presents a new discrete element model for rock-like materials, which is superior to most models in algorithm simplicity and stress analysis. The model is more effective in predicting crack behavior of rock-like materials.
COMPUTERS & STRUCTURES
(2022)
Article
Computer Science, Information Systems
Bosong Yu, Kai Zhang, Ganggang Niu
Summary: This research studied two real-time rock strength determination models based on drilling parameters using a discrete element model, providing a method for simulating rock behavior. The applicability of rock drillability index and drilling specific energy in rock strength assessment was investigated, with results showing that the rock drillability index is more accurate than drilling specific energy.
Article
Engineering, Civil
Xiaohong Wang, Jun Zheng, Hongyue Sun
Summary: This study presents a theoretical method to identify the connecting status of 3-D fractured rock masses based on 2-D geometric information. The percolation threshold can be determined using the average number of intersections per fracture. Numerical experiments confirm the validity of the proposed method, and estimation methods for the geometric information parameter are also discussed.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Zhijie Wang, Xiaohao Rui, Haiyan Xu, Mingfan Zhao, Zhihong Qiu, Zengzhao Zhang
Summary: This paper aims to study the mesoscopic shear mechanical behaviors of fully weathered coastal red sandstone (FWCRS). The results show that the mesoscopic shear mechanical behaviors of FWCRS can be characterized by performing direct shear simulation and there are differences among different rock mass stability grades.
KSCE JOURNAL OF CIVIL ENGINEERING
(2023)
Article
Geochemistry & Geophysics
J. McBeck, Y. Ben-Zion, F. Renard
Summary: This study employs discrete element method simulations to investigate the behavior of parallel faults under different conditions and uses machine learning models to predict the timing of fault reactivation and macroscopic failure. The results demonstrate the significance of strain and velocity components in monitoring crustal strike-slip systems, particularly in relation to the distance from preexisting faults.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geology
Agathe M. Eijsink, James D. Kirkpatrick, Francois Renard, Matt J. Ikari
Summary: There is a lack of direct relation between laboratory measurements and field observations, especially for phyllosilicate-rich gouges. By integrating laboratory friction experiments with surface topography microscopy, a quantitative correlation between frictional slip behavior and fault surface morphology of centimeter-scale samples has been demonstrated. The morphological characteristics observed in the laboratory could indicate the earthquake nucleation potential on natural fault surfaces.
Article
Geochemistry & Geophysics
J. A. McBeck, B. Cordonnier, F. Renard
Summary: Determining the size of the representative elementary volume (REV) is crucial for upscaling properties from laboratory measurements to crustal systems. The REV size is expected to evolve as fracture networks propagate and coalesce. However, it may not systematically increase in all experiments due to the highly heterogeneous porosity distributions. In sandstone experiments, the REV size does increase systematically, suggesting that intact sandstone estimates may be applicable to damaged sandstone.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Marthe G. Guren, Henrik A. Sveinsson, Anders Malthe-Sorenssen, Francois Renard
Summary: The creation of new fractures during an earthquake contributes to rock damage and helps dissipate strain energy. Simulation results show that fracture propagation speed and crack oscillations can lead to nanoscale roughness and fragments. These nanoparticles may control energy dissipation during frictional slip.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Maude Julia, Christine V. Putnis, Helen E. King, Francois Renard
Summary: The interactions between calcium carbonate and cadmium-rich fluid were studied at the nano and microscale under fluid flow and static fluid conditions. The study examined three forms of CaCO3: calcite in single crystals of Iceland Spar, calcite in polycrystalline Carrara marble, and aragonite single crystals. The experiments revealed the nanoscale effect of cadmium on CaCO3 dissolution and growth, as well as the precipitation of a Cd-rich phase on the samples' surfaces. Hydrothermal experiments showed that the reactivity of single calcite crystals was passivated by the epitaxial growth of a less soluble Cd-rich endmember on the sample surface. On the other hand, the presence of grain boundaries or structural changes in Carrara marble and aragonite allowed the replacement of samples by a porous (Ca,Cd)CO3 solid-solution phase.
Article
Engineering, Environmental
G. Montes-Hernandez, L. Feugueur, C. Vernier, A. E. S. Van Driessche, F. Renard
Summary: Current wastewater treatment technologies struggle to remove antibiotics, leading to contamination of water sources. This study demonstrates that aqueous carbonation of portlandite can effectively remove commonly used antibiotics from water. Amoxicillin showed the highest removal efficiency (9.5 mg/g), followed by cefazoline (4.3 mg/g) and ceftriaxone (2.7 mg/g). Comparatively, nanomagnetite-interfacial Fenton reaction is more effective in removing amoxicillin (76.5 mg/g), but is slower and more complex chemically. Both methods show promise at the laboratory scale and can be implemented in wastewater treatment plants.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Jean-Pierre Gratier, Luca Menegon, Francois Renard
Summary: A mechanism involving grain boundary sliding is described for the deformation of fine-grained calcareous shales, which can accommodate large strains of 100%-300% in the Oisans massif in the Western Alps.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Water Resources
Marthe Gronlie Guren, Francois Renard, Catherine Noiriel
Summary: Using time-lapse X-ray micro-tomography, this study provides a detailed 3D characterization of the geometry evolution and dissolution rate mapping of four carbonate samples at pH 4.0. The dissolution rates exhibit a large spatial variability, with crystal edges and convex topographies showing the highest rates and flat surfaces and concave areas showing slower retreat. Microcrystalline aragonite dissolves at a higher rate compared to calcite, and rough microcrystalline calcite surface dissolves more slowly than specific faces of calcite spar crystal. The presence of mineral impurities and the geometry of the crystals and fluid-mineral interface affect the global dissolution process of carbonate rocks.
FRONTIERS IN WATER
(2023)
Article
Geosciences, Multidisciplinary
Joachim Mathiesen, Gaute Linga, Marek Misztal, Francois Renard, Tanguy Le Borgne
Summary: Solute transport in multiphase flow through porous media plays a crucial role in natural systems and geoengineering applications. This study investigates dispersion in multiphase flows using highly resolved numerical simulations of immiscible two-phase flow. The results show that the activation and deactivation of different flow pathways under capillary forces accelerate solute spreading compared to single phase flow. The study establishes transport laws under dynamic multiphase flows and identifies the controlling factors for solute dispersion in porous media.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Physics, Applied
Aldritt Scaria Madathiparambil, Kim Robert Tekseth, Fredrik K. Murer, Benoit Cordonnier, Nicolaine Agofack, Jessica McBeck, Pierre Cerasi, Francois Renard, Basab Chattopadhyay, Dag W. Breiby
Summary: Understanding the mechanical behavior of rocks is crucial for subsurface activities. This study combines 4D mu CT imaging with strain analysis to study the deformation process of Draupne shale. The study reveals intermittent deformation at different locations within the sample, which eventually evolves into a major fracture plane. This suggests that the previously reported macroscopic stress-strain relationship of Draupne shale samples may consist of irreversible processes.
PHYSICAL REVIEW APPLIED
(2023)
Article
Geochemistry & Geophysics
Jessica McBeck, Benoit Cordonnier, Yehuda Ben-Zion, Francois Renard
Summary: The spatial organization of deformation can provide important information about the timing of catastrophic failure in the brittle regime. Recent analyses show that deformation experiences temporary phases of delocalization superposed on an overall trend of localization. X-ray tomography experiments reveal that larger confining pressure promotes more dilation and greater localization of high strain events, while greater amounts of preexisting damage promote delocalization. Importantly, dilative strain may provide more reliable information about the timing of catastrophic failure than shear strain.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Fabian Barras, Kjetil Thogersen, Einat Aharonov, Francois Renard
Summary: The question of what arrests an earthquake rupture is crucial for predicting earthquake magnitude. Using a minimal model, researchers have identified the basic physical parameters that may control the arrest of large ruptures and derived closed-form expressions to predict rupture arrest under different conditions.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Stephen Paul Michalchuk, Sascha Zertani, Francois Renard, Florian Fusseis, Alireza Chogani, Oliver Plumper, Luca Menegon
Summary: This study analyzed pseudotachylytes and mylonitized pseudotachylytes from Lofoten, Norway to understand the evolution of fluid pathways and porosity. It was found that porosity is dispersed within the pseudotachylyte vein, but increased along garnet grain boundaries. The porosity is mainly formed due to metamorphic growth of garnet. In the mylonitized pseudotachylyte, porosity is dramatically reduced due to solution-precipitation processes. Porosity reduction may lead to shear zone hardening and new pseudotachylyte formation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Jess Mcbeck, Benoit Cordonnier, Michele Cooke, Laura Fattaruso, Francois Renard
Summary: Determining how fracture network development leads to macroscopic failure in heterogeneous materials may help estimate the timing of failure in rocks in the upper crust as well as in engineered structures. The proportion of extensile and shear deformation produced by fracture development indicates the appropriate failure criteria to apply, and thus is a key constraint in such an effort. According to synchrotron observations and modeling of triaxial compression experiments on granite, fracture networks transition from shear to extensile immediately before macroscopic failure in order to optimize the total mechanical efficiency of the system.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)