Experimental study of mechanical properties of sandstone at high temperature

  • Rao Qiu-hua  (饶秋华)Email author
  • Wang Zhi  (王志)
  • Xie Hai-feng  (谢海峰)
  • Xie Qiang  (谢强)


Mechanical properties of rock at high temperature are of importance for structure design and safety assessment in underground rock engineering. Brazilian disc test, axial compressive test and three-point bending test are adopted to determine the tensile strength σ t, uniaxial compressive strength σ c, elastic modulus E and Mode I fracture toughness K IC of sandstone at high temperature. Test results show that all of these values (σ t, σ c, E and K IC) are linearly increased with the increasing temperature below a certain temperature, 200 °C or 250 °C, and decreased above this temperature. The linear equations are σ t=0.010 9T+2.322, σ c = 0.181 9T+63.138, E=0.004 9T+10.498 and K IC =0.003 1T+0.60, respectively. Mineral compositions and microstructures of natural rock material have great influences on its mechanical properities at high temperature. Dominance of drying or microcracking would lead to the improvement or degradation of mechanical properities of rock.

Key words

tensile strength compressive strength elastic modulus Mode I fracture toughness high temperature sandstone 


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Copyright information

© Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Rao Qiu-hua  (饶秋华)
    • 1
    Email author
  • Wang Zhi  (王志)
    • 1
  • Xie Hai-feng  (谢海峰)
    • 2
  • Xie Qiang  (谢强)
    • 1
  1. 1.School of Civil and Architecture EngineeringCentral South UniversityChangshaChina
  2. 2.School of Resources and Safety EngineeringCentral South UniversityChangshaChina

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