Article
Computer Science, Interdisciplinary Applications
Wei Zhang, Zhi-hao Zhong, Chong Peng, Wei-hai Yuan, Wei Wu
Summary: The study combines strain smoothing technique with GPU parallel computing to improve computational efficiency. New computation formulations are proposed to save memory space, and the method is validated through several benchmark problems. The capability of GPU-accelerated SPFEM in solving large-scale complicated problems is demonstrated by modeling the progressive failure of a long slope.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Ha H. Bui, Giang D. Nguyen
Summary: This paper introduces the fundamental concepts of SPH and its application in geomechanics and geotechnical engineering, focusing on the establishment of equations and solving partial differential equations. Through a revisit of key SPH concepts, a new approximation formulation for Laplacian is presented. Various applications of SPH in geomechanics and geotechnical engineering are demonstrated.
COMPUTERS AND GEOTECHNICS
(2021)
Review
Engineering, Geological
Tuo Wang, Fengshou Zhang, Jason Furtney, Branko Damjanac
Summary: The past decade has seen significant progress in the research on coupled hydro-mechanical processes in rocks and soils, driven by the study of unconventional hydrocarbon reservoirs and associated risks. Various fluid flow/DEM coupling methods have been developed and applied to geomechanical problems, but there is no universal method due to the complexity of engineering problems and limitations of numerical methods. This paper provides a comprehensive review of fluid flow/DEM coupling methods, discusses their principles, applications, advantages, and disadvantages, and outlines the availability of best practice guidelines.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Energy & Fuels
Mateusz Janiszewski, Sebastian Pontow, Mikael Rinne
Summary: This study analyzes the current state-of-the-art of stope design and finds that the dominance of empirical methods in stope design research is slowly shifting towards numerical methods. The survey results show that there is no single dominant stope design method globally, and empirical methods and personal expertise are still widely used. However, 87% of the respondents indicate a readiness for change in stope design practice.
Article
Energy & Fuels
Michal Kruszewski, Giordano Montegrossi, Erik H. Saenger
Summary: In this study, the potential for fluid-injection-induced fault reactivation and induced seismicity risk during simultaneous injection-extraction operation in a geothermal doublet system in the Ruhr region was investigated. A thermo-hydro-mechanical approach was used to investigate the probability of injection-induced fault rupture. Sensitivity study was performed to evaluate the influence of various factors and it was concluded that thermally-induced stresses play a dominant role during fault reactivation and greatly increase the likelihood for induced seismicity. The results of this study provide valuable insights for the development of future deep geothermal systems worldwide.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Roza Asadi, Behzad Ataie-Ashtiani
Summary: This study utilized advanced finite volume schemes to model the coupled fluid-solid system, considering various parameters and testing the performance of hydro-mechanical models through different cases. While both MPFA O-FEM and DDFV-FEM methods showed good agreement with analytical solutions in homogeneous porous media, the DDFV-FEM demonstrated higher accuracy in situations with high heterogeneity.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Geological
Michal Kruszewski, Giordano Montegrossi, Tobias Backers, Erik H. Saenger
Summary: This study analyzed the reactivation potential of discontinuities in the heavily faulted and folded Upper Carboniferous rock strata of the Ruhr region. The findings suggest a close relationship between secondary permeability and in situ stress state, with implications for utilizing deep geothermal energy in the region. The planar structures in the region serve as main fluid pathways, while some discontinuities may be closed and hydraulically inactive.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Sarah Al Assaad, Hamid M. Nick, Frederic Amour
Summary: The plastic and shear behavior of oil-saturated Danian chalk with different amounts of quartz was assessed. Porosity-dependent functions were proposed to estimate geomechanical properties, and differences in behavior between Danian and Maastrichtian chalk were identified.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Usama Alameedy, Ayad A. Alhaleem, Abubakar Isah, Ahmed Al-Yaseri, Ammar El-Husseiny, Mohamed Mahmoud
Summary: This research aims to predict the dynamic shear slowness of the Mishrif formation in Iraq using the Geolog software's Facimage module and five different statistical techniques. The results show that the multi-resolution graph-based clustering (MRGC) method provides the best match with the actual data. The application of this advanced statistical approach helps to utilize well log data, save time and cost, and improve the ultimate recovery.
JOURNAL OF APPLIED GEOPHYSICS
(2022)
Article
Physics, Particles & Fields
Markus Q. Huber, Christian S. Fischer, Helios Sanchis-Alepuz
Summary: In this study, we calculate the glueball spectrum for spin up to J = 4 and positive charge parity in pure Yang-Mills theory. By constructing full bases for J = 0, 1, 2, 3, 4 and discussing the relation to gauge invariant operators, we obtain ground states and first and second excited states from extrapolations of the eigenvalue curves using a fully self-contained truncation of Dyson-Schwinger equations as input. Comparing our results with available lattice results, we find good quantitative agreement.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Mechanics
Xing Su, Amin Mehrabian
Summary: This paper presents a viscoelastic analytical solution for stress and displacement caused by time-varying changes in pore fluid pressure of a disk-shaped inclusion embedded in a semi-infinite, viscoelastic medium. The solution is derived using the correspondence principle of viscoelasticity, along with Hankel-Fourier and Laplace transforms. Results are presented for different viscoelastic models applied to experimental data from creep tests on shale.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Ocean
Min Luo, Abbas Khayyer, Pengzhi Lin
Summary: This paper provides a state-of-the-art review on the applications of particle methods in hydrodynamics-related problems in ocean and coastal engineering, covering wave hydrodynamics, wave-structure interactions, and wave-current-sediment interactions. The focus is on the latest advancements in enhancing numerical stability, accuracy, efficiency, and consistency in particle methods, as well as the potential future extensions of these methods to a wider range of applications in ocean and coastal engineering.
APPLIED OCEAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Moritz O. Ziegler, Oliver Heidbach
Summary: The distance to failure of upper crustal rock in the prevalent stress field is important for understanding fault reactivation and managing georeservoirs. However, stress magnitude data for model calibration are sparse, leading to large model uncertainties. To reduce uncertainties, additional constraints on stress magnitudes are incorporated to assess the plausibility of different data-based stress states. A case study in southern Germany demonstrates the effectiveness of this approach in identifying plausible stress states and reducing model uncertainties.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Nicolas Brantut, Franciscus M. Aben
Summary: The new type of transducer is capable of measuring local pore fluid pressure in rock samples under high confining pressure conditions, with high accuracy and flexibility in design. The prototypes show good linearity up to 80 MPa with minimal deviations, and are useful for tracking and quantifying changes in permeability associated with faulting and transient flow in different types of rock.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
D. W. Vasco, Gwyn Mali
Summary: The adjoint-based conjugate gradient algorithm is an efficient means for imaging sources of deformation within the Earth. By utilizing two numerical simulations, one can calculate gradient elements for a single model update over time intervals where overburden deforms elastically.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Mechanics
Felix Darve, Francois Nicot, Antoine Wautier, Jiaying Liu
Summary: Granular materials can exhibit two different failure modes: localized mode with shear bands and diffuse mode without macroscopic localized bands. Detailed analysis shows that meso-slip lines and macro-shear bands co-exist at different scales during loading. The study compares and analyzes these two localized patterns to understand why and how meso-slip lines sometimes bifurcate into macro-shear bands.
MECHANICS RESEARCH COMMUNICATIONS
(2021)
Article
Engineering, Geological
Hao Xiong, Zhen-Yu Yin, Francois Nicot, Antoine Wautier, Miot Marie, Felix Darve, Guillaume Veylon, Pierre Philippe
Summary: This paper introduces a novel multi-scale approach for modelling granular column collapse, utilizing a micro-mechanical model and SPH method to successfully simulate the flow of granular column under low water content conditions. The numerical results show good agreement with experimental observations and capture meso-scale behavior.
Article
Materials Science, Multidisciplinary
A. Clerc, A. Wautier, S. Bonelli, F. Nicot
Summary: Granular materials exhibit complex collective behavior resulting from dynamic rearrangements in the micro-structure, where local changes in density lead to jamming or unjamming. This paper investigates instabilities in the form of localized bursts of kinetic energy at both micro and meso scales.
Article
Computer Science, Interdisciplinary Applications
A. Wautier, G. Veylon, M. Miot, M. Pouragha, F. Nicot, R. Wan, F. Darve
Summary: The paper highlights the significance of the H-model in geotechnical engineering, which is a micromechanical approach that can effectively capture the mechanical behavior and mesostructures of granular media.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mathematics, Applied
Jean Lerbet, Noel Challamel, Francois Nicot, Felix Darve
Summary: This paper investigates the stability of Hencky chains under kinematic constraints and the behavior as the degrees of freedom approach infinity. The divergence instability load of non-conservative discrete systems under general kinematic constraints is determined by the second-order work criterion. The exact divergence load pn under kinematic constraints can be found using this criterion.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Mechanics
Sina Massoumi, Noel Challamel, Jean Lerbet, Antoine Wautier, Francois Nicot, Felix Darve
Summary: This study aims to better understand the length scale effects on the bending response of granular beams by investigating a unidimensional discrete granular chain. The bending deformation solutions of the chain asymptotically converge towards the continuum beam model, showing close and eventually coincident results between the granular model and the nonlocal beam model.
Article
Materials Science, Multidisciplinary
Jiaying Liu, Antoine Wautier, Wei Zhou, Francois Nicot, Felix Darve
Summary: The constitutive behaviors of granular materials are affected by particle interactions and geometric arrangements. Understanding the mesoscale properties is crucial for bridging the gap between grain and sample scales. This paper introduces the concept of incremental shear strain chains, which provide a quantitative definition of mesoscale structures. The orientation of shear chains is a material scale property that is independent of boundary conditions, loading paths, and sample densities.
Article
Mechanics
Jiaying Liu, Antoine Wautier, Francois Nicot, Felix Darve, Wei Zhou
Summary: The shear chain concept is used in this study to investigate shear characteristics in granular materials at different scales and to explore the correlations between microscopic and macroscopic shear behaviors. The results show that the orientation of shear bands is influenced by the sample aspect ratio, while the orientation of shear chains only depends on the stress state. It is conjectured that shear bands are formed by a collection of crossing shear chains at the meso scale.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Noel Challamel, Francois Nicot, Antoine Wautier, Felix Darve, Jean Lerbet
Summary: This paper investigates different granular interaction laws used in discrete granular media modeling. It analyzes the properties and applications of these laws and shows that instabilities can occur under large displacements, with discrepancies between models increasing during deformation.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Mathematics, Applied
Sina Massoumi, Noel Challamel, Jean Lerbet, Antoine Wautier, Francois Nicot, Felix Darve
Summary: This paper focuses on studying shear vibration modes of one-dimensional granular microstructured beams using a discrete Cosserat model. The dynamic response of the beams with various boundary conditions is analyzed by solving an exact discrete eigenvalue problem. It is found that for a large number of grains, the dynamic behavior of the beams converges to a Bresse-Timoshenko continuum beam model.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Mathematics, Applied
Jean Lerbet, Noel Challamel, Francois Nicot, Felix Darve
Summary: This paper presents an explicit and coordinate-free formulation of incremental discrete mechanics in potentially non-integrable hypoelasticity. It develops a general framework that treats hypoelasticity as an Ehresmann connection on the cotangent bundle T*M, distinguishing between weak or integrable incremental evolutions and strong or non-integrable incremental evolutions based on the nature of the hypoelastic constitutive law. The geometric structure of the double tangent bundle TT*M is utilized to obtain the geometric counterpart kappa of the tangent stiffness matrix. The validity of the incremental evolution is established under specific conditions in TT*M, and a four-grains hypoelastic granular system is used to illustrate the general results in detail.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Materials Science, Multidisciplinary
F. Nicot, X. Wang, A. Wautier, R. Wan, F. Darve
Summary: This paper investigates the phenomenon of shear banding in granular materials by connecting it to the minimum entropy production theorem and the second-order work theory. The analysis shows that a bifurcation in the failure behavior of granular materials under loading can be thermodynamically interpreted, and it is verified through discrete element simulations. The study suggests a new interpretation of shear banding as the emergence of ordered dissipative structures in nonequilibrium thermodynamics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
