Influence of Thermal Treatment on the Thermal Conductivity of Beishan Granite

  • X. G. Zhao
  • Z. Zhao
  • Z. Guo
  • M. Cai
  • X. Li
  • P. F. Li
  • L. Chen
  • J. Wang
Original Paper
  • 122 Downloads

Abstract

Granitic rocks are potential rock types for hosting high-level radioactive waste (HLW) repositories at depth. A better understanding of rock thermal conductivity is essential to develop HLW repositories successfully. In this work, experimental investigations on the thermal conductivity of thermally treated Beishan granite were conducted. Disk specimens preconditioned at 105 °C were heated to different temperatures (200, 300, 400, 550, 650, and 800 °C) and then cooled to room temperature for testing. Conventional physical properties such as bulk density, porosity, and P-wave velocity were measured under the effect of thermal treatment. Scanning electron microscope was used to characterize thermally induced microcracks in the rock. Thermal conductivities of the treated specimens under dry and water-saturated conditions were determined using the transient plane source method, and the effect of water saturation on the thermal conductivity was investigated. The influences of temperature and axial compression stress on the thermal conductivity were also studied. Results indicate that the thermal conductivity of the specimens depends strongly on the thermal treatment temperature. The thermal conductivity decreases nonlinearly with applied temperature, because of growth and propagation of microcracks in the specimens. On the other hand, water saturation plays an important role in increasing the thermal conductivity. In addition, significant differences exist in the thermal conductivity behaviors of the specimens when subjected to different ambient temperatures and compression stresses. Based on the experimental data, models considering the effect of porosity were established for describing the effects of water saturation, ambient temperature, and compression stress on the thermal conductivity of thermally treated rock.

Keywords

Thermal conductivity Thermal treatment Microcracking Water saturation Ambient temperature Compression stress Beishan granite Geological disposal 

List of symbols

Mp

Mass of rock preconditioned at 105 °C (g)

Mt

Mass of rock after thermal treatment (g)

Vp

Bulk volume of rock preconditioned at 105 °C (cm3)

Vt

Bulk volume of rock after thermal treatment (cm3)

ρp

Bulk density of rock preconditioned at 105 °C (g/cm3)

ρt

Bulk density of rock after thermal treatment (cm3)

np

Porosity of rock preconditioned at 105 °C (%)

nt

Porosity of rock after thermal treatment (%)

vp

P-wave velocity of rock preconditioned at 105 °C (m/s)

vt

P-wave velocity of rock after thermal treatment (m/s)

λp_dry

Thermal conductivity of rock preconditioned at 105 °C (W/mK)

λt_dry

Thermal conductivity of rock after thermal treatment (W/mK)

λp_sat

Thermal conductivity of untreated rock under water-saturated condition (W/mK)

λt_sat

Thermal conductivity of thermally treated rock under water-saturated condition (W/mK)

Tt

Thermal treatment temperature (°C)

T

Ambient temperature (°C)

Rmv

Mass variation ratio of rock before and after thermal treatment (%)

Rve

Volume expansion ratio of rock before and after thermal treatment (%)

S

Effect of water saturation on rock thermal conductivity (%)

St

Effect of water saturation on thermal conductivity of thermally treated rock (%)

λt_T

Thermal conductivity of thermally treated rock at different ambient temperatures (W/mK)

Rt_r

Increase rate of thermal conductivity of thermally treated rock under uniaxial compression (%)

λt_l

Thermal conductivity of thermally treated rock at the last compression stress (W/mK)

λt_0

Thermal conductivity of thermally treated rock at zero stress (W/mK)

Rt

Thermal conductivity ratio of thermally treated rock under uniaxial compression

λt_c

Thermal conductivity of thermally treated rock subjected to different compression stresses (W/mK)

σ1

Axial compression stress (MPa)

σ3

Confining stress (MPa)

A

Fit coefficient

B

Fit coefficient

C

Fit coefficient

Notes

Acknowledgements

This work has been supported by the China Atomic Energy Authority through the geological disposal program.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.CNNC Key Laboratory on Geological Disposal of High-level Radioactive WasteBeijing Research Institute of Uranium GeologyBeijingChina
  2. 2.Department of Civil EngineeringTsinghua UniversityBeijingChina
  3. 3.Bharti School of EngineeringLaurentian UniversitySudburyCanada
  4. 4.Key Laboratory of Ministry of Education for Safe Mining of Deep Metal MinesNortheastern UniversityShenyangChina

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