Dynamic Characteristics of Deep Dolomite Under One-Dimensional Static and Dynamic Loads

Wang, Jianguo; Liu, Yang; Li, Kegang

doi:10.1007/s40030-019-00424-5

Cited by 8 publications

(6 citation statements)

References 13 publications

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“…The SHPB technique has been widely used for testing the dynamic properties of materials under the condition of high strain rates, such as rock [10][11][12][13][14][15]. Based on the fractal theory, Tyler developed a mass fractal model for modelling the distribution of rock fracture bulkiness.…”

Section: Introductionmentioning

confidence: 99%

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Wang

Zuo

et al. 2021

Geofluids

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In order to study the fractal characteristics of the pomegranate biotite schist under the effect of blasting loads, a one-dimensional SHPB impact test was carried out to test the dynamic compressive strength, damage morphology, fracture energy dissipation density, and other parameters of the rocks under different strain rates; besides, sieve tests were conducted to count the mass fractal characteristics of the crushed masses under different strain rates to calculate the fractal dimension of the crushed rock D . Finally, the relationships between fractal dimension and dynamic compressive strength, crushing characteristics, and energy dissipation characteristics were analysed. The results show that under different impact loads, the strain rate effect of the rock is significant and the dynamic compressive strength increases with the increasing strain rate, and they show a multiplicative power relationship. The higher the strain rate of the rock, the deeper the fragmentation and the higher the fractal dimension, and the fractal dimension and rock crushing energy density are multiplied by a power relationship. By performing the comparative analysis of the pomegranate biotite schist, a reasonable strain rate range of 78.75 s-1~82.51 s-1 and a reasonable crushing energy consumption density range of 0.78 J·cm-3~0.92 J·cm-3 were determined. This research provides a great reference for the analysis of dynamic crushing mechanism, crushing block size distribution, and crushing energy consumption of the roadway surrounding rock.

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Section: Introductionmentioning

confidence: 99%

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Wang

Zuo

et al. 2021

Geofluids

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“…For the convenience of comparative analysis, numerical simulation data are still used when the radial static pressure is zero. According to previous research [23], one-dimensional stress wave theory is also applicable when elastic rods and specimens are subjected to combined dynamic and static loading. From the numerical simulation results and the calculation formula of one-dimensional stress wave theory, stress-strain curves of rock specimens under different impact pressures and different radial static pressure were obtained, as shown in Fig.…”

Section: Analysis Of Rock Deformation Characteristicsmentioning

confidence: 99%

Dynamic Brazilian tests of yellow sandstone under coupled static and dynamic loads

Zhang,

Xu,

et al. 2024

J. vibroeng.

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Through a series of static mechanical tests and (SHPB) dynamic impact tests, the static and dynamic mechanical parameters of rock as represented by yellow sandstone are determined, and the Holmquist-Johnson-Cook model parameters of the rock are calibrated using the test data and theoretical calculations. The feasibility of a numerical model is verified, and numerical analysis of the SHPB impact process under different radial pressure pre-loading is carried out on the basis of good verification. The results show that with increasing impact load, the degree of rock breakage increases, as does the dynamic tensile strength. With the application of increasing pre-static pressure, the dynamic tensile strength of the rock decreases gradually, and the maximum radial cumulative strain increases continuously under a given impact pressure, indicating that micro-cracks in the rock develop initially and then expand under the influence of pre-static pressure; the rock is more easily broken, and its weakening degree increases. Under coupled dynamic and static loading, the energy utilization rate of rock in the Brazilian splitting process is jointly affected by axial compression ratio and impact load. Too large a pressure ratio will reduce the strain-rate sensitivity of rock, resulting in low energy utilization rate, while too low an axial compression ratio will make the dynamic tensile strength of rock relatively high, which is not conducive to tensile failure. Therefore, on the premise of clear fracture form requirements, a suitable combination of axial compression ratio and impact velocity can improve the rock crushing effect and energy utilization rate.

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“…As the negative temperature continues to decrease (-30 °C to -40 °C), the slip separation phenomenon increases, and a large number of shear band patterns and quasicleavage fractures appear on the section. At the same time, there are very obvious cracks, which are derived from secondary defects [25][26][27][28]. The lower negative temperature will lead to the formation of secondary defects such as microcracks among the mineral particles in granite.…”

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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Dynamic Characteristics of Deep Dolomite Under One-Dimensional Static and Dynamic Loads

Cited by 8 publications

References 13 publications

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Study on the Fractal Characteristics of the Pomegranate Biotite Schist under Impact Loading

Dynamic Brazilian tests of yellow sandstone under coupled static and dynamic loads

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

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