Abstract:SummaryThis paper presents the development of a three‐dimensional discrete element model using flat‐joint and smooth‐joint contact models to investigate the effect of anisotropy on the tensile behaviour of slate, a transversely isotropic rock, under Brazilian testing from both macro and microscales. The effect of anisotropy is further realised by exploring the influence of foliation orientations (β and ψ) on the tensile strength, fracture pattern, microcracking and stress distribution of the transversely isotr… Show more
“…(3) Mathematical Model (2). e mathematical model of the number of joints and the parameters was brought into the…”
Section: Formulation Of a Mathematical Model Of The Shear Strength Of...mentioning
confidence: 99%
“…Shear strength is one of the important mechanical properties of rock, and the shear strength of rock structural plane has a size e ect [1]. ere are rock mass defects with di erent scales such as pores, voids, and structural planes in the rock mass [2]. Due to the di erence in the number of joints existing in the rock, the number of joints will have an impact on the size e ect of the shear strength of structural plane.…”
The number of joints influences the shear and characteristic strength of structural plane; however, the relationship of the influence is yet to be derived. This study formulates 11 simulation programs using numerical simulation and realistic failure process analysis software. The influence of the number of joints and size on the shear strength of structural plane is studied. The stress-strain curves of different numbers of joints and sizes are analyzed. The mathematical models of the shear strength of structural plane and the number of joints and sizes are proposed, and their specific expressions are obtained. The mathematical models of the shear characteristic size and strength of structural plane and the number of joints are established.
“…(3) Mathematical Model (2). e mathematical model of the number of joints and the parameters was brought into the…”
Section: Formulation Of a Mathematical Model Of The Shear Strength Of...mentioning
confidence: 99%
“…Shear strength is one of the important mechanical properties of rock, and the shear strength of rock structural plane has a size e ect [1]. ere are rock mass defects with di erent scales such as pores, voids, and structural planes in the rock mass [2]. Due to the di erence in the number of joints existing in the rock, the number of joints will have an impact on the size e ect of the shear strength of structural plane.…”
The number of joints influences the shear and characteristic strength of structural plane; however, the relationship of the influence is yet to be derived. This study formulates 11 simulation programs using numerical simulation and realistic failure process analysis software. The influence of the number of joints and size on the shear strength of structural plane is studied. The stress-strain curves of different numbers of joints and sizes are analyzed. The mathematical models of the shear strength of structural plane and the number of joints and sizes are proposed, and their specific expressions are obtained. The mathematical models of the shear characteristic size and strength of structural plane and the number of joints are established.
“…The evaluation indexes of particle gradation and compaction degree are macroscopic phenomenological. Moreover, there are infinite possibilities of particle morphology for aggregates of the same gradation, which makes it difficult to truly ensure that particle morphology is the only independent variable to reveal the stacking mechanical properties [5][6][7][8][9][10]. To study the effect of aggregate morphological characteristics on its compaction and macroscopic mechanical properties, scholars have prepared regularly shaped aggregates such as square, sphere, cylinder, etc, and combined them with the discrete element method to study the effect of aggregate morphological characteristics on the properties of asphalt mixtures [11].…”
The particle size and morphology of crushed stones impact their macroscopic mechanical and physical properties, which has become a hot topic in the study of road and geotechnical engineering. However, some reported studies fail to control the particle morphology as the only independent variable. This paper presented a new method to print artificial aggregates based on 3D printing technology of particles. The applicability of the new method was verified with uniaxial compression and dynamic modulus tests of asphalt mixtures formed by the printing aggregates. Results showed that the printing aggregates earned similar physical properties to real coarse when sintered at 1400℃ with alumina ceramic powder and CuO: TiO2 a 1:2 additive in mass. Besides, the gross volume density, compressive strength, and shrinkage of the printing aggregates show a similar trend of increasing and then decreasing with the increase of additives. The optimal mass percentage of additives was obtained to be 5%. Mechanical tests indicated that the mechanical indexes of the asphalt mixtures formed with the two types of coarse aggregates were similar, while the results of the specimens formed with artificial coarse aggregates showed less dispersion. The stability of test results was significantly improved for different asphalt mixture specimens prepared with 3D printed coarse aggregate. This provides a basic method for further research on the multi-scale properties of particle material.
“…Many rocks exhibit anisotropy in both their mechanical deformation and fluid flow behaviors 1–7 . Failure to consider this aspect could lead to large errors in the prediction of their hydro‐mechanical responses 8–11 .…”
Section: Introductionmentioning
confidence: 99%
“…Many rocks exhibit anisotropy in both their mechanical deformation and fluid flow behaviors. [1][2][3][4][5][6][7] Failure to consider this aspect could lead to large errors in the prediction of their hydro-mechanical responses. [8][9][10][11] Mechanical anisotropy in rocks mainly arises from the presence of cleavage, micro-cracks, and bedding planes.…”
Many clay rocks have distinct bedding planes. Experimental studies have shown that their mechanical properties evolve with the degree of saturation (DOS), often with higher stiffness and strength after drying. For transversely isotropic rocks, the effects of saturation can differ between the bed-normal (BN) and bedparallel (BP) directions, which gives rise to saturation-dependent stiffness and strength anisotropy. Accurate prediction of the mechanical behavior of clay rocks under partially saturated conditions requires numerical models that can capture the evolving elastic and plastic anisotropy with DOS. In this study, we present an anisotropy framework for coupled solid deformation-fluid flow in unsaturated elastoplastic media. We incorporate saturation-dependent strength anisotropy into an anisotropic modified Cam-Clay (MCC) model and consider the evolving anisotropy in both the elastic and plastic responses. The model was calibrated using experimental data from triaxial tests to demonstrate its capability in capturing strength anisotropy at various levels of saturation. Through numerical simulations, we demonstrate the role of evolving stiffness and strength anisotropy in the mechanical behavior of clay rocks. Plane strain simulations of triaxial compression tests were also conducted to demonstrate the impacts of material anisotropy and DOS on the mechanical and fluid flow responses.
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