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Discrete element modeling of transversely isotropic rocks with non-continuous planar fabrics under Brazilian test
https://orcid.org/http://orcid.org/0000-0001-5070-8726
A new numerical approach based on the particle discrete element method (PDEM) is developed to investigate the mechanical behavior of transversely isotropic rocks with non-continuous planar fabrics. In this numerical model, micro-cracks and interactions between grains are represented as flat joint contact, and the contacts with certain dipping angles are assigned as smooth joint contacts to simulate the non-continuous fabrics. The following are studied using the numerical model: (1) the effects of the micro-structure of the rock matrix and the fabric micro-parameters on the tensile and shear strength and the fracture patterns of rocks under Brazilian tests, and (2) the model calibration process for determining the micro-parameters and the failure process of rocks influenced by the micro-structure of the rock matrix. The results show that: (1) based on the Brazilian test results of 20 kinds of transversely isotropic rocks with non-continuous planar fabrics, six patterns regarding the relationship between the normalized failure strength (NFS) and fabric-loading angles are obtained; and (2) the patterns of the NFS curves are slightly affected by the contact state of particles in the rock matrix, while greatly affected by the amount of preexisting micro-cracks in rock matrix, and the stiffness, strength and distributed region of the fabrics; (3) the calibrated results of six typical rocks with different patterns agreed well with the experimental results with regards to failure strength and fracture patterns; and (4) during the failure process, micro-cracks the in rock matrix are mainly formed as the tensile and shear breakage of preexisting cracks, and micro-cracks on fabrics appear mostly at the aggregated region of preexisting cracks.
Discrete element modeling of transversely isotropic rocks with non-continuous planar fabrics under Brazilian test
https://orcid.org/http://orcid.org/0000-0001-5070-8726
A new numerical approach based on the particle discrete element method (PDEM) is developed to investigate the mechanical behavior of transversely isotropic rocks with non-continuous planar fabrics. In this numerical model, micro-cracks and interactions between grains are represented as flat joint contact, and the contacts with certain dipping angles are assigned as smooth joint contacts to simulate the non-continuous fabrics. The following are studied using the numerical model: (1) the effects of the micro-structure of the rock matrix and the fabric micro-parameters on the tensile and shear strength and the fracture patterns of rocks under Brazilian tests, and (2) the model calibration process for determining the micro-parameters and the failure process of rocks influenced by the micro-structure of the rock matrix. The results show that: (1) based on the Brazilian test results of 20 kinds of transversely isotropic rocks with non-continuous planar fabrics, six patterns regarding the relationship between the normalized failure strength (NFS) and fabric-loading angles are obtained; and (2) the patterns of the NFS curves are slightly affected by the contact state of particles in the rock matrix, while greatly affected by the amount of preexisting micro-cracks in rock matrix, and the stiffness, strength and distributed region of the fabrics; (3) the calibrated results of six typical rocks with different patterns agreed well with the experimental results with regards to failure strength and fracture patterns; and (4) during the failure process, micro-cracks the in rock matrix are mainly formed as the tensile and shear breakage of preexisting cracks, and micro-cracks on fabrics appear mostly at the aggregated region of preexisting cracks.
Discrete element modeling of transversely isotropic rocks with non-continuous planar fabrics under Brazilian test
https://orcid.org/http://orcid.org/0000-0001-5070-8726
A new numerical approach based on the particle discrete element method (PDEM) is developed to investigate the mechanical behavior of transversely isotropic rocks with non-continuous planar fabrics. In this numerical model, micro-cracks and interactions between grains are represented as flat joint contact, and the contacts with certain dipping angles are assigned as smooth joint contacts to simulate the non-continuous fabrics. The following are studied using the numerical model: (1) the effects of the micro-structure of the rock matrix and the fabric micro-parameters on the tensile and shear strength and the fracture patterns of rocks under Brazilian tests, and (2) the model calibration process for determining the micro-parameters and the failure process of rocks influenced by the micro-structure of the rock matrix. The results show that: (1) based on the Brazilian test results of 20 kinds of transversely isotropic rocks with non-continuous planar fabrics, six patterns regarding the relationship between the normalized failure strength (NFS) and fabric-loading angles are obtained; and (2) the patterns of the NFS curves are slightly affected by the contact state of particles in the rock matrix, while greatly affected by the amount of preexisting micro-cracks in rock matrix, and the stiffness, strength and distributed region of the fabrics; (3) the calibrated results of six typical rocks with different patterns agreed well with the experimental results with regards to failure strength and fracture patterns; and (4) during the failure process, micro-cracks the in rock matrix are mainly formed as the tensile and shear breakage of preexisting cracks, and micro-cracks on fabrics appear mostly at the aggregated region of preexisting cracks.
Discrete element modeling of transversely isotropic rocks with non-continuous planar fabrics under Brazilian test
Acta Geotech.
Xu, Guowen (author) / Gutierrez, Marte (author) / He, Chuan (author) / Meng, Wei (author)
Acta Geotechnica ; 15 ; 2277-2304
2020-08-01
28 pages
Article (Journal)
Electronic Resource
English
Brazilian test , Fracture pattern , Non-continuous planar fabrics , Particle discrete element method , Transverse isotropy Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
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