Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
권호 표지

A Study on Thermal Shock, Thermal Expansion and Thermal Cracking of Rocks under High Temperature

고온하에서 암석의 열충격, 열팽창 및 열파괴에 관한 연구

  • Published : 1995.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

Thermomechanical characteristics of rocks such as thermal shock, thermal expansion, thermal cracking were experimentally investigaed using Iksan granite, Cheonan tonalite and Chung-ju dolomite to obtain the basic data for proper design and Chung-ju dolomite to obtain the basic data for proper design and stability analysis of underground structures subjected to temperature changes. The effect of thermal shock did not appear when the heating speed was under 3$^{\circ}C$/min. and there existed little difference between multi-staged cyclic heating and single-cycled heating. Thermal expansion of rocks was affected by mineral composition, crack porosity and the degree of thermal craking. In quartz-beraring multimineralic rocks such as Iksan granite and Cheonan tonalite, the thermal expansion coefficient increaseed continuously with temperature rise, but that of Chung-ju dolomite which was a monomineralic rock showed a constant value for the temperature above 250$^{\circ}C$, Chung-ju dolomite yielded the lowest critical threshold temperature(Tc) of 100$^{\circ}C$ and unstable thermal cracking was initiated above the new threshold temperature(Tc')of 300$^{\circ}C$. Above Tc' thermal cracks grew but they were not interconnected. Iksan granite showed closing of microcracks to the temperature of 100$^{\circ}C$, then expanded linearly to Tc of 200$^{\circ}C$. Above Tc, thermal cracking was initiated and progressed rapidly and almost all the grain boundaries were cracked at 600$^{\circ}C$. Cheonan tonalite also showed similar behavior to iksan granite except that Tc was 350$^{\circ}C$ and that thermal cracks propagated more rapidly. Thermal expansions calculated by Turner's equation were found to be valid in predicting the thermal expansion and cracking behavior of rocks.

Keywords

References

  1. Proc. 19th US Symp. on Rock Mech. Thermal cracks in unconfined Sioux quartzite Friedman,M.;Johnson,B.
  2. Geophys. Res. Lett. v.7 Thermally induced acoustic emission in Westerly granite Yong,C.;Wang,C.
  3. Rock Mech. and Rock Eng. v.16 Thermal expansion and cracking of three confined water-saturated igneous rocks to 800℃ Bauer,S.J.;Handin,J.
  4. Tectonophysics v.73 The shift of the α-β transition temperature of quartz associated with the thermal expansion of granite at high pressure Van Der Mollen,I.
  5. Eng. Geology v.20 Behavior of granites and limestones subjected to slow and homegeneous temperature changes Homand,F.;Troalen,J.P.
  6. Introduction to ceramics(2nd Ed.) Kingery,W.D.;Bowen,H.K.;Uhlmann,D.R.
  7. Proc. 19th US Symp. on Rock Mech. Thermal cracking of rock subjected to slow uniform temperature changes Johnson,B.;Gangi,A.F.;Handin,J.
  8. Acta Metal. v.29 Cracking at grain boundaries in polycrystalline brittle materials Davidge,R.W.
  9. Acta Metal. v.26 Microfracture from thermal expansion anisotropy- I, Single phase systems Evans,A.G.
  10. Acta Metal. v.28 Microfracture in brittle solids resulting from anisotropic shape changes Clarke,D.R.
  11. J. Geophys. Res. v.91 Micromechanics of thermally induced cracking in three crustal rocks Fredrich,J.T.;Wong,T.F.
  12. 고온하의 석재물성연구 이정인;이기형;이형원;이상돈
  13. 한국자원공학회지 v.27 화강암질 석재의 열파괴 특성연구 이기형;이형원;신재섭
  14. Int. J. Rock Mech. Min. Sci.& Geomech. Abstr. v.26 Thermally induced microcracking in granites: Characterization and analysis Homand,F.;Houpert,R.
  15. 서울대학교 대학원 박사학위논문 암석의 열파괴와 강도 및 변형거동의 온도의존성에 관한 연구 이형원
  16. 서울대학교 대학원 석사학위논문 고온하에서의 섬록암의 역학적 거동에 관한 연구 정재훈
  17. Ph.D.Thesis, University of Minnesota Microcrack characterization and the fracture mechaism of damaged rock Chen,C.N.
  18. J. Geophys. Res. v.86 The effect of thermal cycling on the seismic quality factor Q of some sedimentary rocks Clark,V.A.;Spencer,T.W.;Trittman,B.R.
  19. Earth Planet. Sci. Lett. v.36 The effect of cracks on thermal expansion of rocks Cooper,H.W.;Simmons,G.
  20. Proc. 22nd US Symp. on Rock Mech. The effect of pressure and temperature on thermal properties of a salt and a quartz monzonite Durham,W.B.;Abey,A.E.
  21. Proc. 21st US Symp. on Rock Mech. Thermal cracking of nonuniformly heated, thick-walled hollow cylinders of Westerly granite Gangi,A.F.
  22. J. Geophys. Res. v.76 High temperature rheology of Westerly granite Goetze,C.
  23. US Air Force Geophys. Laboratory, AFGL-TR-77-0122 Study, evaluate, measure and calculate the thermal cracking of rocks Handin,J.;Friedman,M.;Johnson,B.
  24. Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. v.17 Thermal expansion and inferred permeability of Climax quartz monzonite to 300℃ and 27.6MPa Heard,H.C.
  25. Tectnophysics v.100 Microcracks in rocks: A review Kranz,R.L.
  26. Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. v.12 The influence of temperature dependent properties on thermal rock fragmentation Lehnhoff,T.F.;Scheller,J.D.
  27. Lawrence Berkeley Laboratory, LBL-13435 Laboratory investigations of thermomechanical properties of Stripa granite Myer,L.;Rachiele,R.
  28. J. Geophys. Res. v.83 Characterization of oriented cracks with differential strain analysis Siegfried,R.;Simmons,G.
  29. Handbook of physical constants, Geological Society of America, Memoir.97 Thermal expansion Skinner,B.J.