Effects of thermal treatment on fracture characteristics of granite from Beishan, a possible high-level radioactive waste disposal site in China

Zuo, Jianping; Wang, Jintao; Sun, Yajun; Chen, Yan; Jiang, Guanghui; Li, Yanhong

doi:10.1016/j.engfracmech.2017.04.043

Cited by 122 publications

(37 citation statements)

References 16 publications

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“…According to the previous studies, it is widely recognized that fracture modes can be classified into 3 categories: transgranular fracture, intergranular fracture, and mixed fracture, which can be presented on the surface of the specimen. According to the research results of Zuo et al [1][2][3][4], it can be concluded that the roughness of the fracture surface after fracture is a comprehensive reflection of its microstructure, a magnitude of load and temperature [47,48]. erefore, the fracture trajectory is closely related to the roughness of the rock mass structural surface [49][50][51][52][53].…”

Section: Fracture Trajectorymentioning

confidence: 99%

“…It is necessary to consider the original strength of surrounding rock as well as the influence of thermal stress on its microstructures. According to the study of Zuo et al [1][2][3][4], the highest temperature in the surrounding rock will reach about 100°C-1000°C during the geological disposal of nuclear waste, which will make the surrounding rock undergo drastic high-temperature physical and chemical changes. To prevent the leakage of nuclear wastes, it is essential to study the evolutional processes of mechanical strength and internal microstructures of surrounding rock at high temperature in real time.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, several scholars have concentrated on the study of the damage mechanism, failure criterion, microstructure, and texture evolution of rocks after treatment with high temperature and have obtained some useful research results. Zuo et al [1][2][3][4] systematically studied the thermal cracking, failure mechanism, and fracture morphology of sandstone at various temperatures in real time and determined the influence of temperature on the fracture behavior of sandstone; that is, with the increase in temperature, the fracture mode of rock changes from local brittle fracture to local brittle-ductile coupling fracture. And they considered that 300°C is the threshold temperature for the brittleductile transition.…”

Section: Introductionmentioning

confidence: 99%

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Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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To evaluate the stability and compactness of high-temperature underground construction, it is necessary to test the fracture toughness of surrounding rock (red sandstone) under real-time high temperature. In this paper, SCB specimens recommended by the International Society for Rock Mechanics are used to measure the mode I fracture toughness of red sandstone at real-time high temperatures. Also, to reveal its fracture characteristics and fracture mechanism, the fracture morphology observation (SEM experiment), XRD experiment, mercury intrusion porosimetry testing, and fractal measurement of fracture trajectory are carried out on the red sandstone specimens at various temperatures. The results show that (1) temperature may have a significant impact on the fracture toughness and fracture characteristics of red sandstone. On the whole, the fracture toughness values decrease with the increase in temperature, while the fractal dimensions of fractal trajectories increase with the increase in temperature. (2) Temperature has a significant influence on the fracture mode of red sandstone. At relatively low temperatures (20°C–400°C), the main fracture mode is transgranular failure. At relatively high temperatures (400°C–700°C), the fracture mode is mainly intergranular failure. (3) The weakening mechanism of red sandstone is mainly due to the effect of thermal dehydration when the temperature is between 100°C and 400°C. When the temperature is between 400°C and 700°C, the weakening mechanism is mainly due to thermal cracking and the α-β phase transition of quartz.

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Section: Fracture Trajectorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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“…The TG curve demonstrates three distinct phases. In the first phase (from 25 to 250 °C), the gentle weight loss is normally attributed to the removing of adsorbed water from room temperature to 100 °C [26] and later some crystal water is released from crystal lattices [27]. Then more crystal water and structural water of minerals escape in phase 2 (from 250 to 530 °C) [26].…”

Section: Sample Propertiesmentioning

confidence: 99%

The thermal damaging process of diorite under microwave irradiation

Yuan

Zeng

et al. 2018

Frattura Ed Integrità Strutturale

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Laboratory tests have been conducted to investigate the effects of thermal damage on diorite under microwave irradiation. The sample rocks were heated to high temperature range of 300 to 800 ℃ in a single-mode microwave furnace. The experimental results show that the rocks started to crack at 500 ℃ and completely disintegrated at 700 ℃. The intensities of quartz diffraction peaks were almost unchanged while the diffraction peak intensity of hornblende gradually decreased with temperature increasing. In addition, the chlorite diffraction peak disappeared at 500 ℃. The compressive strength of the sample decreased to 40% at 600 ℃ and it approached zero at 700 ℃. In this paper, the possible reasons for the thermal effects on the fracture of diorite were discussed, which can be related to water evaporation,

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“…For instance, the heat capacity of water and the thermal conductivity of geothermal reservoir affect the thermal production directly [1][2][3][4]. Rock permeability, which depends on temperature, is a key parameter in the underground storage of radioactive nuclear waste [5,6]. Thermal oil recovery can increase the hydraulic conductivity of heavy oil, thus improve the oil production [7,8].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conduction Simulation Based on Reconstructed Digital Rocks with Respect to Fractures

et al. 2019

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Effective thermal conductivity (ETC), as a necessary parameter in the thermal properties of rock, is affected by the pore structure and the thermal conduction conditions. To evaluate the effect of fractures and saturated fluids on sandstone’s thermal conductivity, we simulated thermal conduction along three orthogonal (X, Y, and Z) directions under air- and water-saturated conditions on reconstructed digital rocks with different fractures. The results show that the temperature distribution is separated by the fracture. The significant difference between the thermal conductivities of solid and fluid is the primary factor influencing the temperature distribution, and the thermal conduction mainly depends on the solid phase. A nonlinear reduction of ETC is observed with increasing fracture length and angle. Only when the values of the fracture length and angle are large, a negative effect of fracture aperture on the ETC is apparent. Based on the partial least squares (PLS) regression method, the fluid thermal conductivity shows the greatest positive influence on the ETC value. The fracture length and angle are two other factors significantly influencing the ETC, while the impact of fracture aperture may be ignored. We obtained a predictive equation of ETC which considers the related parameters of digital rocks, including the fracture length, fracture aperture, angle between the fracture and the heat flux direction, porosity, and the thermal conductivity of saturated fluid.

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Effects of thermal treatment on fracture characteristics of granite from Beishan, a possible high-level radioactive waste disposal site in China

Cited by 122 publications

References 16 publications

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

The thermal damaging process of diorite under microwave irradiation

Thermal Conduction Simulation Based on Reconstructed Digital Rocks with Respect to Fractures

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