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Polygonal Grain-Based Distinct Element Modelling of Mechanical Characteristics and Transverse Isotropy of Rock

다각형 입자 기반 개별요소모델을 통한 암석의 역학적 특성과 횡등방성 모사

  • Received : 2016.06.20
  • Accepted : 2016.06.27
  • Published : 2016.06.30

Abstract

This study presents a methodology to reproduce the mechanical behavior of isotropic or transversely isotropic rock using the polygonal grain-based distinct element model. A numerical technique to monitor the evolution of micro-cracks during the simulation was developed in the present study, which enabled us to examine the contribution of tensile cracking and shear cracking to the progressive process of the failure. The numerical results demonstrated good agreement with general observations from rock specimens in terms of the behavior and the evolution of micro-cracks, suggesting the capability of the model to represent the mechanical behavior of rock. We also carried out a parametric study as a fundamental work to examine the relationships between the microscopic properties of the constituents and the macroscopic behavior of the model. Depending on the micro-properties, the model exhibited a variety of responses to the external load in terms of the strength and deformation characteristics. In addition, a numerical technique to reproduce the transversely isotropic rock was suggested and applied to Asan gneiss from Korea. The behavior of the numerical model was in good agreement with the results obtained in the laboratory-scale experiments of the rock.

Keywords

Grain-based model (GBM);Distinct element method;Polygonal grain;Micro-parameter;Transverse isotropy

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Acknowledgement

Grant : 심부 지오시스템 특성 평가기술 개발

Supported by : 한국지질자원연구원