Experimental study on the physical and mechanical variations of hot granite under different cooling treatments

Kang, Fangchao; Jia, Tianrang; Li, Yingchun; Deng, Jiang; Tang, Chun’an; Huang, Xin

doi:10.1016/j.renene.2021.07.132

Cited by 72 publications

(20 citation statements)

References 53 publications

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“…The UCS test was implemented following ISRM's suggested methods (ISRM 1979(ISRM , 2007. UCS was more or less affected by temperature in the ovencooled samples, but decreases were much higher in the water-cooled samples (Kang et al 2021). This may be attributed to the fact that mineral particles are affected more by sudden quenching with water cooling.…”

Section: Resultsmentioning

confidence: 94%

Investigation of the effects of two different cooling treatments on the physico-mechanical and microstructural properties of granite after high temperatures

Kahraman

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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granites. The disintegration of the water-cooled granite samples increased considerably at 1000 °C and measurements could not be taken at this temperature. At the same temperature, water-cooling treatment caused microcracks and micropores, which led to more critical damage to the granite. These conclusions verify that different cooling methods have several effects on the physico-mechanical and microstructural properties of granite, and ensure a foundation for the prediction of rock mass behaviors in situations with high temperature exposure effects (e.g., geothermal exploration and nuclear waste disposal). Article highlights• The physical and mechanical properties of granite are reduced after high temperatures with water and oven cooling methods. • The effect of oven and water cooling increased the impacts on rock physical and mechanical parameters. • The microstructural properties of rock are affected by the treatment temperature and cooling method.

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Section: Resultsmentioning

confidence: 94%

Investigation of the effects of two different cooling treatments on the physico-mechanical and microstructural properties of granite after high temperatures

Kahraman

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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“…With the development of applied thermodynamics, some scholars have noticed the positive effect of heat shock on rock breaking. Domestic and foreign scholars have carried out loading and unloading tests [3]. For example, the thermal and mechanical interactions of rocks after the treatments of microwave irradiation [4,5] and laser irradiation [6,7] in the laboratory are explored, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the different thermal expansion of each mineral component in rock after heated, cracks are formed between the cemented particles and further spread and develop in [10]. As a result of such changes in the internal microstructure of rock, the macroscopic physical mechanics of rock also changes, manifested as the elastic modulus, Poisson's ratio, compressive strength and tensile strength all decrease [3]. For example, the coupled effects of thermal expansion, thermal fracturing, thermal damage and thermal volatilization after heat shock were pointed in [11].…”

Section: Introductionmentioning

confidence: 99%

Evolution of temperature and damage in rock mass after heat shock

Zhu

Teng

et al. 2023

THERM SCI

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Heat shock is a feasible means to break rock mass in engineering duo to the large additional thermal stress caused by thermal expansion. This paper established a coupled thermal transfer and rock deformation model based on the energy conservation and the elastic deformation theory of rock. In the model, the failure and damage of rock are judged according to the Drucker-Prager criterion. A finite element method of COMSOL Multiphysics to study the characteristics of temperature, stress distribution and damage zone on a rock surface is proposed. Results show that the failure of rock mass occurs at the cusps of the heater first duo to stress concentration and then grows at both sides of the heater greatly.

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“…As a common medium for heat transfer, cool water can cause quenching of the surface rock in convective heat transfer channels. The cooling rates are determined by the distance to the surface rock, 2 significantly affecting the mechanical behavior of the reservoir rock 3 . Therefore, the influence of different cooling treatments on the mechanical properties of granite (common bedrock for HDR) has been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of different cooling treatments on the mechanical properties of granite under Brazilian splitting test by grain‐based model 3D

Tian,

Yang,

Yin

et al. 2023

Num Anal Meth Geomechanics

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During the operation of an enhanced geothermal system (EGS), the reservoir rock undergoes different cooling treatments based on the distance to the surface rock. The tensile capacity of reservoir rocks is a key parameter in estimating the parameters of the hydraulic fracturing process. Therefore, the gain‐based model 3D (GBM3D) was constructed to explore the micro behavior of granite under the heating/cooling process and the Brazilian splitting test. The numerical results demonstrate the ability of GBM3D to reproduce the grain interlocking and rotational resistance behavior, making it applicable to simulate the mechanical behavior of granite under uniaxial compression and the Brazilian splitting test. Temperature and cooling rates have significant effects on the stress‐strain curves. With the increase in temperature, the curves after peak strength translate from brittle to ductile, and the turning point of water‐cooled granite is lower than that of air‐cooled granite. When more flaws are present in the specimen, micro‐cracks tend to occur along the loading axial near the center of the specimen. This result can be used to explain the defect in numerical simulation, where cracks are easy to develop near the loading position under the Brazilian splitting test. This work can provide recommendations for hydraulic fracturing.

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Experimental study on the physical and mechanical variations of hot granite under different cooling treatments

Cited by 72 publications

References 53 publications

Investigation of the effects of two different cooling treatments on the physico-mechanical and microstructural properties of granite after high temperatures

Investigation of the effects of two different cooling treatments on the physico-mechanical and microstructural properties of granite after high temperatures

Evolution of temperature and damage in rock mass after heat shock

Influence of different cooling treatments on the mechanical properties of granite under Brazilian splitting test by grain‐based model 3D

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