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Spatial Distribution Functions of Strength Parameters for Simulation of Strength Anisotropy in Transversely Isotropic Rock

횡등방성 암석의 강도 이방성 모사를 위한 강도정수 공간분포함수

  • Lee, Youn-Kyou (Department of Coastal Construction Engineering, Kunsan National University)
  • Received : 2016.04.11
  • Accepted : 2016.04.21
  • Published : 2016.04.30

Abstract

This study suggests three spatial distribution functions of strength parameters, which can be adopted in the derivation of failure conditions for transversely isotropic rocks. All three proposed functions, which are the oblate spheroidal function, the exponential function, and the function based on the directional projection of the strength parameter tensor, consist of two model parameters. With assumption that the cohesion and friction angle can be described by the proposed distribution functions, the transversely isotropic Mohr-Coulomb criterion is formulated and used as a failure condition in the simulation of the conventional triaxial tests. The simulation results confirm that the failure criteria incorporating the proposed distribution functions could reproduce the general trend in the variations of the axial stress at failure and the directions of failure planes with varying inclination of the weankness planes and confining pressure. Among three distribution functions, the function based on the directional projection of the strength parameter tensor yields the highest axial strength, while the axial strength estimated by the oblate spheroidal distribution function is the lowest.

Keywords

Transversely isotropy;Failure criteria;Cohesion;Friction angle;Direction of failure plane

Acknowledgement

Supported by : 한국연구재단

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