Journal
ENVIRONMENTAL EARTH SCIENCES
Volume 77, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1007/s12665-018-7514-3
Keywords
Thermal damage; Porosity; Wave velocity; Micro-mechanism; Damage coefficient; Critical threshold
Funding
- National Science Foundation of China [41672279]
- Fundamental Research Funds for the Central Universities [2011QNA04]
- State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) [173114]
- China Postdoctoral Science Foundation [2017M621872]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The evolution of porosity and changes in wave velocity in granite after high-temperature treatment has been experimentally investigated in different studies. Statistical analysis of the test results shows that there is a temperature threshold value that leads to variations in porosity and wave velocity. At a temperature that is less than 200 degrees C, the porosity of granite slowly increases with increases in temperature, while the wave velocity decreases. When the temperature is greater than 200 degrees C (especially between 400 and 600 degrees C), the porosity quickly increases, while the wave velocity substantially decreases. The temperature ranges of room temperature to 200 and 200-400 degrees C correspond to the undamaged state and the micro-damage state, respectively. The results confirm that there is an important link between the variations of physical and mechanical properties in response to thermal treatment. By studying the relationships among rock porosity, wave velocity and temperature, this provides the basis for solving multi-variable coupling problems under high temperatures for the thermal exploitation of petroleum and safe disposal of nuclear waste.
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