Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

Zhang, Zhiyu; Qian, Qingyun; Wang, Hao; Huang, Yonghui; Wang, Jianguo; Liu, Haoshan

doi:10.2113/2021/8403502

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…Using the three-wave method, the stressstrain rates were calculated [27][28][29]. Using the one-dimensional stress wave assumption, the incident, transmitted, and reflected energies that were emitted during the whole test were obtained [30,31]. The energy dissipation that occurs between the rock specimen and the compression bar is not considered during the test, and the energy absorption density can be calculated as per the energy conservation law [32,33].…”

Section: Determination Of Stress Equilibrium and Strain Ratementioning

confidence: 99%

Study on dynamic response characteristics of impact of freeze-thaw saturated marble in plateau area

Huang,

Yin,

et al. 2023

PLoS ONE

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To study the effects that the perennial freeze–thaw environment exerts on the dynamic mechanical properties of marble, which characterizes the Qinghai-Tibet Plateau, impact tests were conducted, and saturated marble was utilized; thus, we analyzed the effect of different loading rates on its dynamic compressive strength, fragmentation pattern, and energy-absorbing density. The results indicate the following: (1) When 42.02s-1 ≤ε˙≤ 49.20s-1, the degree of fragmentation and the fractal dimension of saturated state marble is greater than that of the dry state marble; when ε˙<42.02s-1 or ε˙>49.20s-1, the dry state marble exhibits greater fragmentation than the saturated marble; (2) When the saturated state marble is subjected to a specific fractal dimension, the energy-absorbing density of the marble that characterizes the saturated state is great compared with the dry state, and when the fractal dimension increases, the energy-absorbing densities that characterize the two states gradually converge. (3) The effect of water on the mechanical properties of marble has an obvious rate dependence, showing a weakening effect at low strain rates and a strengthening effect at high strain rates. In regard to the analysis pertaining to the dynamic fracture mechanism of marble under the influence of the freeze-thaw environment that characterizes the plateau, the aforementioned experimental results exhibit considerable significance.

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Section: Determination Of Stress Equilibrium and Strain Ratementioning

confidence: 99%

Study on dynamic response characteristics of impact of freeze-thaw saturated marble in plateau area

Huang,

Yin,

et al. 2023

PLoS ONE

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“…The lower negative temperature will lead to the formation of secondary defects such as microcracks among the mineral particles in granite. These cracks have poor plastic deformation ability and are easy to destabilize and expand under high strain rate loading [29][30][31][32][33][34][35][36][37]. Moreover, the coupling effect of impact and negative temperature will cause the cleavage of some crystalline minerals.…”

Section: Geofluidsmentioning

confidence: 99%

Study on Deterioration Effect of Dynamic Mechanical Properties of Granite at Subzero Temperatures

Yang

Wang

2022

Geofluids

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In the present work, through the dynamic impact test of frozen granite, the effect of temperature on the dynamic mechanical performances of granite at high strain rates were investigated. Based on the existing energy and damage theory, the effects of different low temperatures on the energy dissipation, damage variables, and strength of red sandstone are explored. The reasons for the deterioration of granite dynamic mechanical strength at low temperature are studied by combining analyses of fracture morphology. Researched results showed that low temperatures (<-20°C) cause “frostbite” in granite, leading to the sharp decrease of dynamic and macromechanical strength of the rock under a high strain. Under this dynamic disturbance, transient engineering disasters are easy to occur. The analysis of fracture morphology showed that the lower negative temperature results in the formation of cracks among the mineral particles in the granite. Under high strain rate loading, these cracks have poor plastic deformation ability and are easily destabilized and expanded. Moreover, frozen granite tends to be brittle as a whole. With the decrease of negative temperature, its fracture behavior gradually changes from cleavage fracture to transgranular fracture, and the failure mode also changes from tensile failure to shear failure. The coupling effect of impact and the lower negative temperature will cause the quasicleavage of some crystalline minerals, eventually leading to low-stress brittle failure of granite.

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“…Gong et al [25] proposed a new criterion for rockburst tendency based on the linear energy storage law and residual elastic energy indices considering the energy consumption characteristics during rock loading. Wang Jianguo [26][27][28][29] et al tested the dynamic compressive strength, damage morphology, fracture energy density, and other parameters of rocks using pomegranate biotite schist and metamorphic limestones. The fractal patterns of rock deformation and damage were reasonably explained from the perspective of energy dissipation.…”

Section: Introductionmentioning

confidence: 99%

Fracture Process and Failure Characteristics of Sandstone with Different Height-to-Diameter Ratios

Zhang,

Li,

Yan

et al. 2023

Processes

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The mechanical properties of rock materials significantly depend on their size due to their heterogeneity and the spatial randomness of joint development—a factor often neglected in pillar design and stability analyses within mining engineering. The rock samples examined herein were 100 mm in diameter and 100 mm, 200 mm, or 300 mm in height. This research analyzed the respective mechanical phenomena and failure patterns of rock specimens with varying height-to-diameter ratios under uniaxial compression. The experiment showed that the greater the height-to-diameter ratio, the smaller the elastic modulus and compressive strength. Remarkably, as the height-to-diameter ratio grew, the failure forms of the samples transitioned from splitting to shearing, while their peak strength gradually diminished. Specifically, a hike from 1:1 to 3:1 in the height-to-diameter ratio led to a roughly 20% decrease in peak strength. Utilizing the real rock fracture process analysis system (RFPA3D), the fracture processes and failure characteristics of rock specimens with dissimilar aspect ratios were comparatively explored from a microscopic viewpoint, with acoustic emissions revealing the entire process from crack initialization to penetration. The failure analysis affirmed that the simulation results corresponded closely with the experimental findings. The resultant research can offer theoretical support for the multiscale mechanical properties, fracture processes, and prediction of rock failure in mining engineering.

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Study on the Dynamic Mechanical Properties of Metamorphic Limestone under Impact Loading

Cited by 14 publications

References 20 publications

Study on dynamic response characteristics of impact of freeze-thaw saturated marble in plateau area

Study on dynamic response characteristics of impact of freeze-thaw saturated marble in plateau area

Study on Deterioration Effect of Dynamic Mechanical Properties of Granite at Subzero Temperatures

Fracture Process and Failure Characteristics of Sandstone with Different Height-to-Diameter Ratios

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