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Rock Mechanics and Rock Engineering

, Volume 52, Issue 10, pp 3719–3735 | Cite as

Numerical Investigation on the Mechanical Properties of Australian Strathbogie Granite Under Different Temperatures Using Discrete Element Method

  • Hui Liu
  • Kai ZhangEmail author
  • Shishi Shao
  • Pathegama Gamage Ranjith
Original Paper

Abstract

A series of laboratory tests was conducted on Australian Strathbogie granite with different grain sizes from fine to coarse, which focus on the influence of temperature on the mechanical properties of the rock. The specimens were compressed under different temperatures, varying from room temperature to 800 °C. A numerical model using Discrete Element Method was proposed to investigate the mechanism of heat-induced fracturing, which could handle both the inter-granular and intra-granular fractures. In the simulation, three kinds of grain sizes with different grain distribution were considered, which are fine grain (FG), medium grain (MG) and coarse grain (CG). All FG, MG and CG models were performed using the same set of strength and stiffness parameters. It was found that the outcome of the numerical model had a good consistency with the results from the compressive tests, both in strength and deformation. The compressive strength of granite showed decreasing trends with increasing temperature, while failure strain showed the opposite trends. The temperature induced fractures increased quickly as temperature increased especially when temperature was above 400 °C and the fractures were mainly inter-granular tensile ones. The intra-granular fractures began to appear as the temperatures were over 400 °C. As for grain size homogeneity, the compressive strength decreased as the heterogeneity of granite grains increased. The heterogeneous granite had more intra-granular fractures than uniform granite at high temperatures.

Keywords

Australian Strathbogie granite Heat-induced fracture Grain size Heterogeneity Discrete element method 

List of Symbols

So

Sorting coefficient

Q25%

The diameter which 25% of the grains are larger than this diameter on the grain size accumulative frequency diagram

Q75%

The diameter which 75% of the grains are larger than this diameter on the grain size accumulative frequency diagram

K

Bulk modulus

G

Shear modulus

ΔZmin

The smallest width of the zone which is beside the contact in the normal direction

Kn

Normal stiffness

Ks

Shear stiffness

Notes

Funding

This study was funded by the Fundamental Research Funds for the Central. Universities (Grant number 2018ZZCX04).

Compliance with ethical standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouChina
  2. 2.School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhouChina
  3. 3.Deep Earth Energy Research Laboratory, Department of Civil EngineeringMonash UniversityClaytonAustralia

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