Experimental study on the variation of physical and mechanical properties of rock after high temperature treatment

Zhang, Weiqiang; Sun, Qiang; Hao, Shuqing; Geng, Jishi; Lv, Chao

doi:10.1016/j.applthermaleng.2016.01.010

Cited by 309 publications

(94 citation statements)

References 10 publications

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“…A new mineral is formed. The crystalline water evaporates and escapes at less than 400 ∘ C. The loss of component water and crystalline water will lead to the destruction of the crystal structure of the mineral [21].…”

Section: Discussionmentioning

confidence: 99%

“…The evolution can be divided into three different stages. The different states of water (attached water, bound water, and mineral combined water) that exist inside the rock will evaporate after high temperature treatment [21]. In the first phase, from 20 ∘ C to 200 ∘ C, the porosity average increases from 0.73% to 0.87% slowly, and the increase rate is 18.28%.…”

Section: Variation In Ultrasonic P-wave Velocitymentioning

confidence: 99%

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Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Zhang

Jing

2018

Shock and Vibration

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Thermal damage and energy evolution characteristics in process of impact failure of sandstone after high temperature treatment were studied by split Hopkinson pressure bar (SHPB) system. The ultrasonic P-wave velocity, density, porosity, peak stress, / 0 , thermal damage, fracture, and energy evolution characteristics of sandstone with temperature during the experimental process were explored. Results show that, with the increase of temperature, the ultrasonic P-wave velocity and density decrease, while the porosity increases. It is found that the peak stress and / 0 decrease with the increase of temperature, and the decreasing trend is fitted with the simple cubic equation. Above 600 ∘ C, dynamic peak stress and / 0 decrease rapidly. The thermal damage of rock increases with the increase of temperature, which is in accordance with the logistic curve model. The thresholds of damage strain energy release rate are 200 ∘ C and 800 ∘ C in this research. Its total input strain energy decreases with the increase of processing temperature and decreases sharply when the temperature is over 600 ∘ C. The variation of total input strain energy has small change at the range from 400 ∘ C to 600 ∘ C.

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Section: Discussionmentioning

confidence: 99%

Section: Variation In Ultrasonic P-wave Velocitymentioning

confidence: 99%

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Zhang

Jing

2018

Shock and Vibration

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“…With increasing temperature, permeability increases owing to the increase in number and size of pores and cracks. Scholars have researched the effects of temperature on rock properties from different aspects, such as breakage mesomechanism [13][14][15][16], mechanical property [17][18][19][20], acoustic property [21][22][23], and permeability [22][23][24][25]. Few experimental equipments can measure the permeability directly at high temperature (above 150 ∘ C).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Wave Velocity-Permeability Model for Granite Subjected to Different Temperature Processing

Jiang

Zuo

et al. 2017

Geofluids

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Understanding the change of permeability of rocks before and after heating is of great significance for exploitation of hydrocarbon resources and disposal of nuclear waste. The rock permeability under high temperature cannot be measured with most of the existing methods. In this paper, quality, wave velocity, and permeability of granite specimen from Maluanshan tunnel are measured after high temperature processing. Quality and wave velocity of granite decrease and permeability of granite increases with increasing temperature. Using porosity as the medium, a new wave velocity-permeability model is established with modified wave velocityporosity formula and Kozeny-Carman formula. Under some given wave velocities and corresponding permeabilities through experiment, the permeabilities at different temperatures and wave velocities can be obtained. By comparing the experimental and the theoretical results, the proposed formulas are verified. In addition, a sensitivity analysis is performed to examine the effect of particle size, wave velocities in rock matrix, and pore fluid on permeability: permeability increases with increasing particle size, wave velocities in rock matrix, and pore fluid; the higher the rock wave velocity, the lower the effect of wave velocities in rock matrix and pore fluid on permeability.

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“…Under the influence of temperature, thermal cracking occurs inside the granite due to the anisotropy and mismatch of the thermal expansion of the minerals, and the release of water inside the granite increases the amount of internal micro-cracks [45][46][47]. Therefore, the damage of the granite sample caused by the temperature increases with temperature.…”

Section: Discussionmentioning

confidence: 99%

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

Zhao

Jin

2020

Energies

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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....

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Experimental study on the variation of physical and mechanical properties of rock after high temperature treatment

Cited by 309 publications

References 10 publications

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Experimental Study on Thermal Damage and Energy Evolution of Sandstone after High Temperature Treatment

Experimental Investigation of Wave Velocity-Permeability Model for Granite Subjected to Different Temperature Processing

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

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