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Effects of thermal treatment on the macroscopic physical properties and microstructure of Beishan fine-grained granite
Abstract Beishan granite is an ideal surrounding rock for high-level radioactive waste repository, and its stability plays an important role in the safe disposal of nuclear waste. However, the surrounding rock will be affected by temperature due to the heat released by nuclide decay. Therefore, it is of great significance for engineering practice to study the thermal damage mechanisms of surrounding rock considering thermal effect. In this paper, the apparent characteristics, mass, P-wave velocity, thermal conductivity, Leeb hardness, resistivity, and heat transfer characteristics after high temperature are investigated from room temperature to 800 °C. The results show that the physical parameters of granite show different variation laws under various thermal treatments. In addition, the critical temperature of the physical parameters of granite is obtained by normalizing different physical parameters. The thermal damage mechanisms of rock are discussed, and the evolution process of microcrack is observed by a scanning electron microscope (SEM). Meanwhile, the multi-field coupled numerical simulation software COMSOL is used to simulate the heat transfer characteristics of granite after treatment at different temperatures. The numerical simulation results and the 3D fitted plots of heating temperature, heating duration, and the temperature inside the sample show that the heat transfer efficiency peaks at 500 °C. The results of the study could provide useful insights for the geological disposal of high-level radioactive waste.
Effects of thermal treatment on the macroscopic physical properties and microstructure of Beishan fine-grained granite
Abstract Beishan granite is an ideal surrounding rock for high-level radioactive waste repository, and its stability plays an important role in the safe disposal of nuclear waste. However, the surrounding rock will be affected by temperature due to the heat released by nuclide decay. Therefore, it is of great significance for engineering practice to study the thermal damage mechanisms of surrounding rock considering thermal effect. In this paper, the apparent characteristics, mass, P-wave velocity, thermal conductivity, Leeb hardness, resistivity, and heat transfer characteristics after high temperature are investigated from room temperature to 800 °C. The results show that the physical parameters of granite show different variation laws under various thermal treatments. In addition, the critical temperature of the physical parameters of granite is obtained by normalizing different physical parameters. The thermal damage mechanisms of rock are discussed, and the evolution process of microcrack is observed by a scanning electron microscope (SEM). Meanwhile, the multi-field coupled numerical simulation software COMSOL is used to simulate the heat transfer characteristics of granite after treatment at different temperatures. The numerical simulation results and the 3D fitted plots of heating temperature, heating duration, and the temperature inside the sample show that the heat transfer efficiency peaks at 500 °C. The results of the study could provide useful insights for the geological disposal of high-level radioactive waste.
Effects of thermal treatment on the macroscopic physical properties and microstructure of Beishan fine-grained granite
Liu, Zu-Xi (author) / Wu, Yun (author) / Li, Xiao-Zhao (author) / Huang, Zhen (author) / Lin, Jian (author) / Pan, Xiao-Hua (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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