Effect of thermal damage on tensile strength and microstructure of granite: a case study of Beishan, China

Wu, Yun; Li, Xiaozhao; Huang, Zhen; Wang, Yingchao; Deng, Long-Chuan

doi:10.1007/s40948-021-00278-x

Cited by 14 publications

(2 citation statements)

References 26 publications

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“…The elastic modulus decreases to 9.3 GPa, and the reduction rate is 21.3%. The evolution trends of the peak strength and elastic modulus of the preholed granite specimens are consistent with those of the intact granite specimens 30,31 and preflawed granite specimens. 10 The phenomenon of mechanical parameter variation is discussed further in Section 4.…”

Section: Mechanical Propertiessupporting

confidence: 76%

Experimental investigation on the mechanical properties of thermally damaged granite specimens containing pre‐existing holes

Huang

Yang

Tian

et al. 2022

Fatigue Fract Eng Mat Struct

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A comprehensive understanding of the mechanical behavior of thermally damaged rock is crucial for the design, prediction, and stability control of rock engineering. However, the strength and fracture characteristics of rock containing pre-existing flaws have not been studied systematically. Therefore, in this study, uniaxial compression tests were conducted on preholed granite specimens using MTS816 rock mechanics testing and acoustic emission (AE) monitoring systems. The mechanical properties, AE characteristics, and failure patterns of thermally damaged granite specimens were analyzed, and the alteration of the mechanical behavior was explained by the P-wave velocity, effective porosity, mineral components, and thermal cracking. The results show that the peak strength and elastic modulus of preholed granite specimens first increased and then decreased with the increasingly high temperature. Cracks were always initiated from the left and right perimeters of the preexisting hole, and the crack coalescence modes between the two pre-existing holes were independent of the high temperature. After 150 C treatment, thermal cracks were observed, and the complexity and interconnectivity of the fracture surface increased with temperature. The variations of the mineral component and crystal structure induced by increasing the high temperature contributed to the thermal damage of the granite. The experimental results are expected to enhance the understanding of the macromechanical and mesomechanical behaviors of rock with respect to high temperature.

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Section: Mechanical Propertiessupporting

confidence: 76%

Experimental investigation on the mechanical properties of thermally damaged granite specimens containing pre‐existing holes

Huang

Yang

Tian

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Heating treatment may create more cracks in the rock, and these thermally induced cracks would in turn change the rock's physical and mechanical properties (Ge & Sun, 2018; Murru et al, 2018; Nara et al, 2011; Souley et al, 2001; Z. W. Wang et al, 2021; X. G. Wu et al, 2018; Y. Wu et al, 2021). Moreover, once a high‐temperature rock is put in cold media (water, nuclide), the number of cracks would increase, causing severe damage to the internal structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of cooling speed on the physical and mechanical properties of granite in geothermal‐related engineering

Deng

et al. 2022

Deep Underground Science and Engineering

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In deep-earth engineering, the high earth temperature can significantly affect the rock's mechanical properties, especially when the rock is cooled during the construction process. Accordingly, whether the cooling speed affects the mechanical and physical properties of rocks is worth to be investigated. The present study explored the influence of the cooling rate on the physical and chemical properties of granite heated at 25-800 °C. The mechanical and physical properties involved in this study included uniaxial compression strength, peak strain, modulus, P-wave velocity, mass and volume, the change of which could reflect the sensitivity of granite to the cooling rate. Acoustic emission (AE) monitoring, microscopic observation, and X-ray diffraction (XRD) are used to analyze the underlying damage mechanism. It is found that more AE signals and large-scale cracks are accounted for based on the b-value method when the specimens are cooled by water. Furthermore, the microscopic observation by polarized light microscopy indicates that the density, opening degree, and connectivity of the cracks under water cooling mode are higher than that under natural cooling mode. In addition, the XRD illustrates that there is no obvious change in mineral content and diffraction angle at different temperatures, which confirms that the change of mechanical properties is not related to the chemical properties. The present conclusion can provide a perspective to assess the damage caused by different cooling methods to hot rocks.

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Uniaxial compression tests on red sandstone specimens after different high-temperature processing and cooling time

Yang

Fang

Lyu

et al. 2022

Bull Eng Geol Environ

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Effect of thermal damage on tensile strength and microstructure of granite: a case study of Beishan, China

Cited by 14 publications

References 26 publications

Experimental investigation on the mechanical properties of thermally damaged granite specimens containing pre‐existing holes

Experimental investigation on the mechanical properties of thermally damaged granite specimens containing pre‐existing holes

Influence of cooling speed on the physical and mechanical properties of granite in geothermal‐related engineering

Uniaxial compression tests on red sandstone specimens after different high-temperature processing and cooling time

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