Experimental study on thermo-mechanical properties of Beishan granite under mild temperature

Tian, Yunlei; Chen, Shiwan; Zuo, Shuangying; Yang, Fubo; He, Qi; Zheng, Kexun

doi:10.1016/j.csite.2022.102271

Cited by 13 publications

(5 citation statements)

References 38 publications

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“…Figure 4F shows that the accumulated AE count increases slowly first with increasing testing time, followed by a sharp increase, which agrees well with intact granite and sandstone specimens after high‐temperature treatments 5,32,33 . However, after higher‐temperature treatments (600–900°C), the increase rate and the total number of accumulated AE counts are lower than that after lower‐temperature treatments (25–450°C), which agrees with the observation of Beishan granite at high temperature 34 . This indicates that the preholed granite specimen releases less elastic energy under higher temperatures.…”

Section: Results and Analysissupporting

confidence: 83%

“…5,32,33 However, after higher-temperature treatments (600-900 C), the increase rate and the total number of accumulated AE counts are lower than that after lower-temperature treatments (25-450 C), which agrees with the observation of Beishan granite at high temperature. 34 This indicates that the preholed granite specimen releases less elastic energy under higher temperatures.…”

Section: Ae Characteristicsmentioning

confidence: 97%

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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: Results and Analysissupporting

confidence: 83%

Section: Ae Characteristicsmentioning

confidence: 97%

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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“…Pandey and Singh (1986) studied deformation of rock in different tensile tests. Meanwhile, the acoustic emission (AE) technique, a kind of useful means to monitor the development and evolution of microcracks during rock deformation, is widely used in rock damage analysis (Liu B. X. et al, 2009;Tian et al, 2022). Extensive information can be reflected by AE signals, including the evolution process (Pei et al, 2013), the mechanism of failure (Aggelis et al, 2013;Gan et al, 2020), and the quantification and location of damage (Liu Y. M. et al, 2009;Tian et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mechanisms and Early Warning Strategies of Geotechnical Disasters

2024

Frontiers Research Topics

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Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

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“…Pandey and Singh (1986) studied deformation of rock in different tensile tests. Meanwhile, the acoustic emission (AE) technique, a kind of useful means to monitor the development and evolution of microcracks during rock deformation, is widely used in rock damage analysis (Liu B. X. et al, 2009;Tian et al, 2022). Extensive information can be reflected by AE signals, including the evolution process (Pei et al, 2013), the mechanism of failure (Aggelis et al, 2013;Zhou et al, 2019;Gan et al, 2020), and the quantification and location of damage (Liu Y. M. et al, 2009;Tian et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Bending-damaged fracture criterion and numerical implementation of limestone beam under three-point bending test

Tian

et al. 2023

Front. Earth Sci.

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To study the characteristics of tensile cracking by rock-bending damage, the bending stress–strain curves and the cumulative ringing counts were obtained by a three-point bending test and acoustic emission (AE) monitoring of limestone beams. Based on the Lemaitre strain equivalent principle and the continuous damage theory, the bending damage variable D was defined by the AE cumulative ringing counts, and the bending crack damage evolution equation was established according to the Weibull distribution of the rock element strength. To realize the numerical test of the bending deformation, the damage variable D was used as the intermediate variable, and the specific process of damage bending stress transformation and the realization of the tensile crack criterion were secondary developed by FISH language in FLAC3D. According to the results, the central part of rock beam deforms downward under the action of bending stress, and both ends tilt up. Therefore, the bending failure begins with the tensile crack at the bottom of the rock beam and gradually extends to the compression zone. The maximum damage value is about 0.402 before the peak stress. The compressive stress in the x direction increases from the neutral layer to the top of the rock beam, and the tensile stress in the x direction increases from the neutral layer to the bottom of the rock beam. The maximum tensile stress is distributed in the center of the bottom of the specimen, where the bending effect is obvious. The stress–time curve was divided into the (Ⅰ) compaction stage, (Ⅱ) expansion stage, and (Ⅲ) penetration stage, accordingly, and the evolution of damage equation was divided into three stages: initial damage stage, slow damage stage, and accelerated damage stage. The curves of the experimental result, theoretical model prediction result, and numerical simulation result were in good agreement with each other, which indicates that the numerical simulation based on the criterion of rock damaged fracture can better reflect the bending process of rock beams under three-point bending stress.

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Experimental study on thermo-mechanical properties of Beishan granite under mild temperature

Cited by 13 publications

References 38 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

Mechanisms and Early Warning Strategies of Geotechnical Disasters

Bending-damaged fracture criterion and numerical implementation of limestone beam under three-point bending test

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