Influence of different thermal cycling treatments on the physical, mechanical and transport properties of granite

Jin, Peihua; Hu, Yue; Shao, Jixi; Zhao, Guokai; Zhu, Xiaozhou; Li, Chun

doi:10.1016/j.geothermics.2018.12.008

Cited by 139 publications

(54 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e realtime heated sample 2 in this study showed nonmonotonic change in permeability. Permeability of slow-cooling treated granite samples started to drastically increase at approximately 500°C in [26,[30][31][32]. For fast-cooling treated samples, permeability significantly increased at about 400°C seen in [32,33].…”

Section: Comparison and Practical Meaningmentioning

confidence: 97%

Effect of Multistage Thermal Cracking on Permeability of Granite

Feng

Zhao

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Experiments on thermal cracking in granite sample were conducted through acoustic emission monitoring, and changes in permeability were concomitantly studied using 600°C 20 MN servo-controlled triaxial rock mechanics testing machine. Two granite samples, 200 mm in diameter and 400 mm long, from Shandong, China, were selected for these experiments. Both samples were heated up to 500°C at ambient pressure. We find that thermal cracking of large-scaled granite is discontinuous and exhibits multiple stages with temperature. In addition, the permeability exhibits the following characteristics: (a) it neither increases nor decreases monotonously with the temperature rising and it exhibits multipeak due to the multistage thermal cracking; (b) the temperature of permeability peak lags behind that of the drastic acoustic emission activities. Both AE counts and permeability dramatically increased after 300°C, which indicated serious thermal cracking occurred after 300°C. Permeability ratio is approximately linear with the ratio of AE cumulative counts. The results will be helpful for understanding the mechanism of geothermal reservoir construction and long-term evaluation of safety for nuclear waste geological disposal.

show abstract

Section: Comparison and Practical Meaningmentioning

confidence: 97%

Effect of Multistage Thermal Cracking on Permeability of Granite

Feng

Zhao

et al. 2020

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…Energies 2020, 13,2061 11 of 17 Figure 8. Variations of strain corresponding to upper loads of granite samples with number of temperature and stress cycles at six upper limit cyclic temperatures (a) upper limit of cyclic stress = 70% of UCS, (b) upper limit of cyclic stress = 85% of UCS.…”

Section: Dissipated Energymentioning

confidence: 99%

“…From Figure 10, it can be seen that the energy absorbed by the rock samples during the loading process decreases generally with the increase in number of cycles, and then it gradually tends to stabilize. Further, the absorption energy of Energies 2020, 13,2061 12 of 17 the rock samples at 70% loading stress during the loading process reduces successively during the first few cycles and then tends to stabilize, whereas for the samples at 85% loading stress, there is a sharp decrease in the absorption energy during the first two cycles and then changes slightly. Figure 11 shows similar trends for the hysteresis energy when the upper limit of cyclic temperature is 100-500 • C. The hysteresis energy decreases and increases with the number of cycles when the upper limit cyclic temperature is 600 • C and the upper stress limits are 70% and 85% of the UCS.…”

Section: Dissipated Energymentioning

confidence: 99%

“…Many earlier studies focused on the mechanical properties of rock subjected to either cyclic temperature or cyclic loading, but not both. In recent years, a concern regarding the effect of cyclic temperature on deep rock engineering and geotechnical engineering has arisen [11][12][13][14][15][16][17][18][19][20][21][22]. Some studies sample.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploratory Experimental Study on the Mechanical Properties of Granite Subjected to Cyclic Temperature and Uniaxial Stress

Zhao

Jin

2020

Energies

Self Cite

View full text Add to dashboard Cite

This paper investigates the variation of mechanical properties of granite during temperature and stress cycling, which is an important part of evaluating the long-term thermal and mechanical stability of thermal energy storage. Cyclic temperature and loading tests were conducted where the upper limit of cyclic temperature was 100-600 • C, and the upper stress limits were 70% and 85% of the average uniaxial compressive strength (UCS) at the corresponding temperature. The response of stress-strain characteristics of the granite samples to changes in temperature, and cyclic load upper limit, while the number of temperature and loading cycles was comprehensively analyzed. The results show that the temperature and stress cycles have significant effects on the mechanical properties of granite (i.e., stress-strain curve, strength, elastic modulus, and deformation). The elastic modulus of the sample during loading increases gradually. The strain corresponding to the upper loads of the granite samples decreases with an increasing number of cycles. Additionally, the UCS of samples after 10 cycles at 70% loading stress is greater than that at 85% loading stress. The mechanical properties of samples change dramatically during the first and second cycles at 85% loading stress, whereas at 70% loading stress, the mechanical properties change gradually in the first few cycles, and then tend to stabilize. Cyclic hardening is observed at temperatures below 500 • C, where post cyclic UCS is greater than the uncycled average UCS. This phenomenon requires further research.Energies 2020, 13, 2061 2 of 17 reported the effect of cyclic temperature on the physical and mechanical properties of rocks. Rong et al. [11,12] investigated the influence of thermal cycling on the physical and mechanical properties of rock (i.e., marble and granite) through a uniaxial compression test and conducted microscopic observations to investigate the thermal damage of rock sample induced by the treatment of different thermal cycles. Battaglia et al. [15] measured the linear thermal expansion of marbles subjected to thermal cycles utilizing a high-sensitivity apparatus. Lin et al. [16] investigated the variation of residual strain and micro-crack density of granite with cyclic temperature in the range of 600 • C, and explained the mechanism of permanent deformation caused by micro-cracks from the microscopic perspective. Fang [18] analyzed and compared the effects of mechanical properties of marble subjected to thermal treatment and thermal cycling. They showed that the physical and mechanical properties of rock samples deteriorate gradually with an increasing number of temperature cycles. Further, other researchers considered that the deterioration of the mechanical properties of building materials and engineering structures in cold regions with harsh climatic conditions was due to freeze-thaw cycles [19][20][21].Most of the earlier studies on the effect of cyclic loading on the mechanical properties of rocks did not consider the effect of temperature, i....

show abstract

“…It has been shown that cooling rate and maximal temperature are often key parameters in controlling the crack network [Belayachi et al, 2019]. In our study, two cooling protocols were considered: slow cooling [Wang et al, 2013] and thermal shocks [Kim et al, 2014;Mallet et al, 2015;Kumari et al, 2017;Jin et al, 2019], both presenting different maximal temperature [Beck et al, 2016]. Concerning the temperature range, it is common to find in the literature studies investigating the thermally induced cracks from 200 o C to 600 o C [Zhao et al, 2017;Rong et al, 2018;Gautam et al, 2018].…”

Section: Introductionmentioning

confidence: 99%

Multi-geophysical Approach for the Characterization of Thermally-Induced Cracks in Granite: Discussion of Reproducibility and Persistence

Boussaid

Mallet

Beck

et al. 2020

Pure Appl. Geophys.

View full text Add to dashboard Cite

We study damage induced by low temperature variations in granite samples given their role in shallow geological reservoirs. We consider two thermal treatments, slow cooling and thermal shock, and implement a multi-geophysical approach to characterize the induced micro-scale damage. The methodology consists in monitoring elastic wave velocity and thermal conductivity as well as describing the damage by the way of Hg-porosity measurements and microscopic observations. To discuss the reproducibility of the induced damage, the same thermal protocol is performed on five samples. Our first results indicate that the thermal shock leads to a more pronounced damage. This is interpreted to be due to a larger variety of nucleated intragranular and intergranular cracks as observed by SEM and optic microscope. Yet, this more significant damage does not appear reproducible from one sample to another compared to the damage introduced by slow cooling. According to this first result, thereby, we propose a timely monitoring of elastic wave velocity, conductivity and Hg-porosity. It appears that the damage introduced by the slow cooling, unlike the thermal shock, does not present a long persistence. Indeed, after 15 days, the different properties had returned to their initial state. A time-dependence mechanism is proposed to discuss this observed process.

show abstract

Influence of different thermal cycling treatments on the physical, mechanical and transport properties of granite

Cited by 139 publications

References 63 publications

Effect of Multistage Thermal Cracking on Permeability of Granite

Effect of Multistage Thermal Cracking on Permeability of Granite

Exploratory Experimental Study on the Mechanical Properties of Granite Subjected to Cyclic Temperature and Uniaxial Stress

Multi-geophysical Approach for the Characterization of Thermally-Induced Cracks in Granite: Discussion of Reproducibility and Persistence

Contact Info

Product

Resources

About