Abstract
Finite/discrete element methods (FDEM) are hybrid numerical models that use algorithms to analyze the transition from continuous to discontinuous. This type of formulation allows modeling physical laboratory tests with greater proximity to reality. This article proposes to simulate the average behavior of a uniaxial compression test campaign. The tests were modeled and calibrated based on the strength and the fracture pattern using Geomechanica Inc. Irazu two-dimensional software. The simulated results were analyzed by the mean standard deviation of approximately 3000 elements in the middle third of the model, the same region where the clip gages are located in the physical test. The obtained results show that FDEM can replicate the laboratory test with great similarity.
Highlights
This study proposes to simulate laboratory tests of a meta-andesite using a hybrid numerical model - Finite Element Method / Discrete Element Method (FEM-DEM or Finite/discrete element methods (FDEM))
Several properties obtained in the physical tests, such as density, Young’s modulus, Poisson ratio, tensile strength, cohesion, and internal friction angle, were used in the uniaxial compression strength (UCS) test modeling
The physical parameters calibrated simulation of the uniaxial compression in the previous steps were used for the test of a specimen with the mean dimensions of the actual specimens used in laboratory tests
Summary
This study proposes to simulate laboratory tests of a meta-andesite using a hybrid numerical model - Finite Element Method / Discrete Element Method (FEM-DEM or FDEM). The uniaxial compression strength (UCS) test is a physical test used to characterize the mechanical behavior of the intact rock. This test, described in Goodman (1989) and Brady and Brown (2004), is one of the most common procedures to directly define the intact rock strength, it's Youngs modulus and its Poisson ratio (Stefanizzi, et al, 2009). (2018) used the LS-Dyna to investigate the mechanical behavior of rocks by comparing the uniaxial compression tests performed in the laboratory and numerical model outputs. The results were analyzed by the mean standard deviation of approximately 3000 elements in the middle third of the model, the same region where the clip gages are located in the physical test
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