Investigation of meso-failure behaviors of Jinping marble using SEM with bending loading system

Zuo, Jianping; Xu, Weiya; Pei, Jianyong; Zhao, Xiaoping

doi:10.1016/j.jrmge.2015.06.009

Cited by 22 publications

(12 citation statements)

References 4 publications

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“…According to the previous studies, it is widely recognized that fracture modes can be classified into 3 categories: transgranular fracture, intergranular fracture, and mixed fracture, which can be presented on the surface of the specimen. According to the research results of Zuo et al [1][2][3][4], it can be concluded that the roughness of the fracture surface after fracture is a comprehensive reflection of its microstructure, a magnitude of load and temperature [47,48]. erefore, the fracture trajectory is closely related to the roughness of the rock mass structural surface [49][50][51][52][53].…”

Section: Fracture Trajectorymentioning

confidence: 99%

“…is fully demonstrates that the fracture behaviors of sandstone are greatly affected by high temperature. (2) According to the relationships between fracture toughness and temperature (i.e., curve slope), the variational trend of the curve can be divided into three stages: (1) the slow increase stage (20°C-100°C). e curve slope at this stage is 0.0055.…”

Section: Load-displacement Curvesmentioning

confidence: 99%

“…It is necessary to consider the original strength of surrounding rock as well as the influence of thermal stress on its microstructures. According to the study of Zuo et al [1][2][3][4], the highest temperature in the surrounding rock will reach about 100°C-1000°C during the geological disposal of nuclear waste, which will make the surrounding rock undergo drastic high-temperature physical and chemical changes. To prevent the leakage of nuclear wastes, it is essential to study the evolutional processes of mechanical strength and internal microstructures of surrounding rock at high temperature in real time.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, several scholars have concentrated on the study of the damage mechanism, failure criterion, microstructure, and texture evolution of rocks after treatment with high temperature and have obtained some useful research results. Zuo et al [1][2][3][4] systematically studied the thermal cracking, failure mechanism, and fracture morphology of sandstone at various temperatures in real time and determined the influence of temperature on the fracture behavior of sandstone; that is, with the increase in temperature, the fracture mode of rock changes from local brittle fracture to local brittle-ductile coupling fracture. And they considered that 300°C is the threshold temperature for the brittleductile transition.…”

Section: Introductionmentioning

confidence: 99%

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Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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To evaluate the stability and compactness of high-temperature underground construction, it is necessary to test the fracture toughness of surrounding rock (red sandstone) under real-time high temperature. In this paper, SCB specimens recommended by the International Society for Rock Mechanics are used to measure the mode I fracture toughness of red sandstone at real-time high temperatures. Also, to reveal its fracture characteristics and fracture mechanism, the fracture morphology observation (SEM experiment), XRD experiment, mercury intrusion porosimetry testing, and fractal measurement of fracture trajectory are carried out on the red sandstone specimens at various temperatures. The results show that (1) temperature may have a significant impact on the fracture toughness and fracture characteristics of red sandstone. On the whole, the fracture toughness values decrease with the increase in temperature, while the fractal dimensions of fractal trajectories increase with the increase in temperature. (2) Temperature has a significant influence on the fracture mode of red sandstone. At relatively low temperatures (20°C–400°C), the main fracture mode is transgranular failure. At relatively high temperatures (400°C–700°C), the fracture mode is mainly intergranular failure. (3) The weakening mechanism of red sandstone is mainly due to the effect of thermal dehydration when the temperature is between 100°C and 400°C. When the temperature is between 400°C and 700°C, the weakening mechanism is mainly due to thermal cracking and the α-β phase transition of quartz.

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Section: Fracture Trajectorymentioning

confidence: 99%

Section: Load-displacement Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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“…The digital speckle correlation method (DSCM) and laser-scanner equipment were applied to investigate the meso-deformation field of deep rock under diverse temperatures and stress conditions (Zuo et al 2008b(Zuo et al , 2011c (Fig. 9a), and fracture morphology (Zuo et al 2015c) (Fig. 9b).…”

Section: Mecroscopic Mechanical Behaviormentioning

confidence: 99%

Macro/meso failure behavior of surrounding rock in deep roadway and its control technology

Zuo

Wang

Jiang

2019

Int J Coal Sci Technol

Self Cite

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Engineering disasters occur frequently and violently with the increase in mining depth, which is mostly due to insufficient study on the failure mechanism of the deep rock mass. In this paper, theoretical and experimental researches on the failure behaviors and deformation control of deep surrounding rock in recent years were reviewed. Macro/meso failure mechanism of deep rock or coal-rock combined body under different loading conditions have been systematically investigated. Stress gradient failure theory of surrounding rock, uniform strength support in the deep roadway, and the analogous hyperbola movement model of overlying strata were preliminary established and a combined grouting control technology for surface and underground was proposed. Abovementioned achievements are expected to offer theoretical bases and technical supports for the exploitation of China's deep mineral resources in the future.

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Strength Behavior, Creep Failure and Permeability Change of a Tight Marble Under Triaxial Compression

Liu

Shao

2016

Rock Mech Rock Eng

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Investigation of meso-failure behaviors of Jinping marble using SEM with bending loading system

Cited by 22 publications

References 4 publications

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Macro/meso failure behavior of surrounding rock in deep roadway and its control technology

Strength Behavior, Creep Failure and Permeability Change of a Tight Marble Under Triaxial Compression

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