Article
Engineering, Geological
Fan Fei, Jinhyun Choo
Summary: In this paper, the Barton-Bandis model is extended to cyclic loading conditions and an implicit solution algorithm is developed. This work enables the application of the Barton-Bandis model to a wider range of problems in rock mechanics and rock engineering.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Zhi Zheng, Hongyu Xu, Wei Wang, Qiang Zhang, Yujie Wang, Qiancheng Sun, Honghui Tao, Xiaofeng Han
Summary: In the excavation of water-related underground projects, the complex stress path and stress state redistribution of the surrounding rock can cause damage and failure under the hydro-mechanical coupling condition. However, the understanding and theoretical models of rock hydro-mechanical coupling characteristics under complex stress paths are limited. This study conducted a series of tests to investigate the effects of different stress paths, stress levels, and seepage pressure on rock deformation, strength, failure, and permeability.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Zhihong Zhao, Tao Lin, Yuedu Chen, Xingguang Zhao, Liang Chen, Ju Wang
Summary: This study investigates the shear behaviors of naturally infilled granite fractures using experimental and numerical approaches. The results show that the infilling ratio has a significant influence on the shear properties of the infilled fractures, and there are differences in shear behaviors between different infilled and clean fractures.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Geological
Yi Tang, Hang Lin, Rihong Cao, Shuwei Sun, Wenhua Zha
Summary: Rock sections in intermittent joints are crucial in maintaining rock mass stability and preventing joint interconnection. The orientation of these rock sections significantly impacts the uniaxial compressive strength and damage mode of the samples. As the angle of the rock section increases, there is an increase in the compaction stage and a decrease in the plastic-yield stage. Additionally, the damage constitutive model considering compaction stage and initial damage provides insights into the rate of rock damage affected by the rock section angle.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Yatao Yan, Jianchun Li, Xing Li
Summary: The deformed response of rock joints under dynamic loads significantly affects the mechanical properties of rock masses. This study examines the dynamic compression behavior of rock joints with different joint roughness using digital image correlation (DIC) technique. The results show that the dynamic compressive behavior of rock joints has viscoelastic features. A variable-order fractional Kelvin-Voigt (VFKV) model is proposed to simulate this behavior, which effectively represents the dynamic compressive process of rock joints. The study also discusses the influence of model parameters, loading rate, and joint contact area ratio on the viscoelastic behavior and mechanical properties of rock joints.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Engineering, Geological
Yanbo Zhu, Xing Huang, Yaowen Liu, Zhenqian Liu, Hengxing Lan, Wanghui Tian
Summary: The fatigue damage characteristics of gypsum rock differ from other types of rocks due to its unique crystal microstructures. The fatigue life and deformation evolution of gypsum rock are sensitive to multiple cyclic loading conditions. The proposed nonlinear viscoelastoplastic fatigue model can predict the fatigue deformation evolution of gypsum rock well.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Engineering, Geological
Amit Kumar Shrivastava, K. Seshagiri Rao
Summary: This article discusses the use of commercial software for analyzing and designing rock slopes, underground structures, and other projects. It highlights the importance of correctly predicting the strength and deformation behavior of rock joints for safe and sustainable design. The article presents a numerical study of unfilled and infilled rock joints using the commercial software Udec, comparing the results with physical model tests. The study found that the numerical model accurately predicted the strength under certain conditions, but failed to predict the shear strength under other conditions.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-GEOTECHNICAL ENGINEERING
(2022)
Article
Energy & Fuels
Kai Zhao, Haoran Li, Hongling Ma, Haibing Yu, Hang Li, Zhen Zeng, Zhuyan Zheng, Xiangsheng Chen, Chunhe Yang
Summary: In this study, the behavior of salt subjected to creep-fatigue load was tested and analyzed. The results showed a negative and positive interaction between creep and fatigue load, respectively. Prior creep or fatigue load affected the strain rate and loading modulus in subsequent stages.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Environmental
Qingzhao Zhang, Zejun Luo, Danyi Shen, Zhenming Shi, Qing Pan
Summary: Stress relaxation is a significant manifestation of rheological behaviors in rock joints, which has crucial influences on the stability of rock engineering. The current study systematically investigated the stress relaxation characteristics of red sandstone joints under different surface morphology and initial shear stress conditions through shear stress relaxation tests. Empirical and nonlinear Maxwell models were established to accurately capture the stress relaxation behavior of rock joints. The results indicated that the relaxation stress of rock joints increased with the increase of initial shear stress and surface morphology index, and the shear relaxation process involved two stages: the decelerating stress relaxation stage and the stable stress relaxation stage.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Energy & Fuels
Fan Yang, Jinyang Fan, Zhenyu Yang, Wei Liu, Jie Chen
Summary: Salt rock is considered as an ideal source for oil, natural gas, and compressed air due to its good deformation and low permeability. The rate correlation of the mechanical characteristics of salt rock is crucial in analyzing the deformation and convergence of the reservoir, and establishing a corresponding constitutive model. This model accurately evaluates reservoir safety and designs reservoir operating pressure.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Bing Sun, Peng Yang, Shun Liu, Sheng Zeng
Summary: The influence of damage degree on dynamic characteristics of damaged rock mass was studied through cyclic loading test and impact failure test. The dynamic constitutive model of damaged granite was established by improving the Zhu-Wang-Tang constitutive model. The results showed that the Felicity effect was significant when the cyclic upper limit stress reached 60% of the compressive strength of rock mass.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Geological
M. A. Pirzada, M. Bahaaddini, M. S. Andersen, H. Roshan
Summary: The hydraulic conductivity of rock joints is a crucial factor in controlling fluid flow in rock engineering applications. This study investigates the effects of shearing and normal loading on the hydraulic conductivity of rock joints, which is mainly influenced by hydraulic aperture. Through a series of experiments, the evolution of joint aperture and contact area is explored. The results show that the joint conductivity is closely related to the mean hydraulic aperture of joint profiles, and damaged asperities hinder fluid flow during shearing experiments. The trend in contact area closely follows the flow rate, and even at high normal stresses, full contact is not physically possible. A new correlation is proposed to accurately estimate experimental flow rates under different loading conditions.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Ivan Janecek, Deepak Amban Mishra, Chitralekha Satheesan Vishnu, Jiri Scucka, Lenka Vaculikova, Petr Martinec
Summary: This article investigates the deformation response of compact sedimentary rock under triaxial stress conditions, finding that the stiffness moduli depend on the loading path. The deformation behavior of the sandstone is nonlinear and shows anisotropy.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
Zhikai Dong, Yinping Li, Haoran Li, Xilin Shi, Hongling Ma, Kai Zhao, Yuanxi Liu, Tao He, Dongzhou Xie, Ahu Zhao
Summary: This study investigates the influence of loading history on the creep behavior of rock salt through laboratory tests and numerical simulations. The results show that the improved multi-stage loading data processing method is effective, cracks are more developed in samples with an early loading history, and the steady-state creep rate of rock salt is independent of loading history but related to stress and temperature. This study provides important insights into the understanding of loading history effects on rock salt creep and offers a basis for the design, construction, and operation of gas storage salt caverns.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Multidisciplinary Sciences
Yanting Wang, Dong Wang, Guanghe Li, Laigui Wang, Chun Zhu, Yongzhi Du, Zhiwei Zhou
Summary: In areas with large diurnal temperature differences, freeze-thaw cycles and frost heaving force generate cracks within the rock, posing a serious threat to the stability and safety of geotechnical engineering structures and surrounding buildings. This study developed a nonlinear viscoelastic-plastic creep damage model that accurately describes rock deformation under freeze-thaw cycles. The model parameters were determined and validated using triaxial creep data, and it was found that the model can accurately describe rock deformation in three creep stages and the time-dependent strain in the third stage.
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
Geochemistry & Geophysics
Frederic-Victor Donze, Yann Klinger, Viviana Bonilla-Sierra, Jerome Duriez, Liqing Jiao, Luc Scholtes
Summary: Segment lengths along major strike-slip faults are related to the thickness of the brittle crust, as shown by mechanical models. The results indicate a relationship between the orientation and spacing of Riedels and the thickness of the brittle layer, with different spacings observed depending on the mode of motion.
Article
Computer Science, Interdisciplinary Applications
Luc Sibille, Nadia Benahmed, Felix Darve
Summary: This study investigates the capability of a discrete element model to predict the constitutive response of a soil, showing that the model, calibrated from monotonous drained triaxial compressions, can provide good qualitative and quantitative predictions even for non-rectilinear loading paths or those involving rotation of principal stress axes. The study also emphasizes the importance of simplicity of use and robust validation loading paths for such a modelling framework.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
T. Mohamed, J. Duriez, G. Veylon, L. Peyras
Summary: Two different DEM models were proposed to quantitatively simulate the macroscopic response of Toyoura sand under various loading conditions. The first model used spherical particles with additional rolling resistance stiffness, while the second model used 3D polyhedrons defined from 2D micrographs of Toyoura particles. Both models were calibrated using triaxial compression tests, showing similar predictive abilities but the polyhedral approach was easier to calibrate and offered a more precise description of particle shapes and initial fabric anisotropy.
COMPUTERS AND GEOTECHNICS
(2022)
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
Engineering, Geological
T. Mohamed, J. Duriez, G. Veylon, L. Peyras, P. Soulat
Summary: This article presents a discrete element method model for simulating tropical residual soils and discusses its applications and advantages. The model provides both macroscopic and microscopic information on the mechanical behavior of tropical soils and can be used for numerical modeling and analysis.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(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)
Article
Engineering, Geological
Tarek Mohamed, Jerome Duriez, Guillaume Veylon, Laurent Peyras, Patrick Soulat
Summary: A three-dimensional multi-scale discrete-continuum model (FVM x DEM) is developed for describing the mechanical behavior of granular soils in boundary value problems. The model incorporates direct DEM computations on representative volume elements to derive the constitutive response. The multi-scale approach considers the inertial effect in stress homogenization and is compared with a classical BVP simulation adopting a bounding surface plasticity model.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
