Experimental investigation on mechanical behaviors of Nanan granite after thermal treatment under conventional triaxial compression

Zhu, Zhennan; Tian, Hong; Mei, Gang; Jiang, Guosheng; Dou, Bin; Xiao, Pan

doi:10.1007/s12665-020-09326-3

Cited by 41 publications

(16 citation statements)

References 47 publications

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“…6,8,9). Evaporation can affect the microstructure of granite, and the wave velocity in solid is much higher than that in air (Sun et al 2015;Zhu et al 2021b). Due to the sudden shock effect, microstructural changes increased more in water cooling, and this case caused a greater decrease in P and S wave velocity and a greater increase in porosity in water cooling.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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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“…It is costly and time-consuming to determine the mechanical properties of rock by mechanical tests, but the non-destructive rock testing technology can solve this problem [18]. Acoustic waves would refract when they encounter cracks in the rock, which would reduce the macroscopic P-wave velocity of rocks.…”

Section: Relationship Between V P and Mechanical Parameters Of Granitementioning

confidence: 99%

“…Past studies have shown that there is no doubt that high-temperature treatment and rapid cooling have a thermal shock on the mechanical properties of crystalline rocks. Scholars have done extensive research on the physical, mechanical, and microstructure performances of granites exposed to thermal shock [4,5,9,10,[14][15][16][17][18][19][20][21][22][23][24]. Martyushev et al confirmed that effective pressure can alter reservoir properties [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…Kumari et al [23] studied the effect mechanism of cooling rate on the physical and mechanical properties of granite and found that thermal shock will weaken the mechanical behaviors of rock, which is mainly achieved by forming microcracks in rock. Zhu et al studied experimentally the influence of thermal shock on the physical and mechanical properties of granite and the cracking characteristics of granite under the thermal shock [5,14,18,40,41]. The results show that the high temperature treatment causes lots of microcracks in the specimens.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates

et al. 2021

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During the construction of nuclear waste storage facilities, deep drilling, and geothermal energy development, high-temperature rocks are inevitably subjected to thermal shock. The physical and mechanical behaviors of granite treated with different thermal shocks were analyzed by non-destructive (P-wave velocity test) and destructive tests (uniaxial compression test and Brazil splitting test). The results show that the P-wave velocity (VP), uniaxial compressive strength (UCS), elastic modulus (E), and tensile strength (st) of specimens all decrease with the treatment temperature. Compared with air cooling, water cooling causes greater damage to the mechanical properties of granite. Thermal shock induces thermal stress inside the rock due to inhomogeneous expansion of mineral particles and further causes the initiation and propagation of microcracks which alter the mechanical behaviors of granite. Rapid cooling aggravates the damage degree of specimens. The failure pattern gradually transforms from longitudinal fracture to shear failure with temperature. In addition, there is a good fitting relationship between P-wave velocity and mechanical parameters of granite after different temperature treatments, which indicates P-wave velocity can be used to evaluate rock damage and predict rock mechanical parameters. The research results can provide guidance for high-temperature rock engineering.

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“…Extensive studies have been performed to investigate the damage evolution mechanism of rocks based on triaxial compression tests [ 3 , 4 , 5 , 6 , 7 ]. In general, the damage process of rocks under triaxial compression can be categorized into four stages, i.e., the initial compaction stage, the linear elastic stage, the yield stage, and final broken stage [ 8 , 9 , 10 , 11 ]. Correspondingly, a number of theoretical models were proposed to characterize different stages of the damage evolution process of rocks [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Two Novel Acoustic Emission Parameters on Identifying the Instability of Granite

Jiang

et al. 2022

Entropy

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The issue of monitoring and early warning of rock instability has received increasing critical attention in the study of rock engineering. To investigate the damage evolution process of granite under triaxial compression tests, acoustic emission (AE) tests were performed simultaneously. This study firstly introduced two novel parameters, i.e., the coefficient of variation (CoV) of the information entropy and correlation dimension of the amplitude data from the AE tests, to identify the precursor of the failure of granite. Then the relationship between the changes in these parameters and the stress-time curve was compared and analyzed. The results of this study show that: (1) There is a strong correlation between the CoV of the information entropy and the failure process of granite. The granite failed when the CoV curve raised to a plateau, which could be used as an indicator of rock instability. (2) The fluctuation of the correlation dimension indicates the different stages during the loading process, i.e., the initial compaction stage, the linear elastic stage, the yield stage, and the failure stage. Each stage contains a descending and a rising process in the correlation dimension curve, and the exhibited starting point or the bottom point at the correlation dimension curve could be selected as the indicator point for the rock instability. (3) The combined analysis of the Information entropy and Correlation dimension can improve the accuracy of rock instability prediction. This study provides new insights into the prediction of rock instability, which has theoretical implications for the stability of subsurface engineering rock masses.

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Experimental investigation on mechanical behaviors of Nanan granite after thermal treatment under conventional triaxial compression

Cited by 41 publications

References 47 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

Mechanical Behaviors of Granite after Thermal Shock with Different Cooling Rates

Application of Two Novel Acoustic Emission Parameters on Identifying the Instability of Granite

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