Hybrid lattice/discrete element method for bonded block modeling of rocks

The Hybrid Lattice/Discrete Element Method is proposed for Bonded Block Modeling of rocks. The method is a combination of the Rigid Body Spring Network Lattice Model with the Discrete Element Method. The main advantages of the new method are: (i) it operates based on either a homogeneous or heteroge...

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Bibliographic Details
Published in:Computers and geotechnics 2021-02, Vol.130, p.103907, Article 103907
Main Author: Rasmussen, Leandro Lima
Format: Article
Language:English
Subjects:
Bonded block model
Calibration
Compression
Compressive strength
Crack initiation
Deformability
DEM
Discrete element method
Elasticity
Formability
Heterogeneity
Hybrid LDEM
Laboratories
Mechanical properties
Modelling
Modulus of elasticity
Poisson's ratio
Probability distribution
Probability theory
Properties
Properties (attributes)
RBSN lattice model
Rigid structures
Rock
Rocks
Strength
Stress
Tensile strength
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Summary:The Hybrid Lattice/Discrete Element Method is proposed for Bonded Block Modeling of rocks. The method is a combination of the Rigid Body Spring Network Lattice Model with the Discrete Element Method. The main advantages of the new method are: (i) it operates based on either a homogeneous or heterogeneous material assumption, with heterogeneity being represented by means of the Weibull probability distribution applied to elasticity and strength parameters; and (ii) it provides for a direct material calibration scheme for rock models based on both assumptions, which does not require trial-and-error iterations. Thirteen rock types, including igneous, metamorphic, and sedimentary ones were simulated in the two-dimensional version of the method considering both assumptions, and their numerical macroscale properties were compared to the laboratory ones. Results show that while deformability and peak strength properties were accurately represented by the homogeneous models, linear elastic-brittle behavior manifested. On the other hand, the heterogeneous models presented non-linear stress–strain behavior and provided reasonable matches for the following laboratory properties: Young modulus, Poisson’s ratio, crack initiation stress, crack damage stress, unconfined compression strength, and direct tensile strength.
ISSN:0266-352X
1873-7633
DOI:10.1016/j.compgeo.2020.103907