Mechanical Behavior and Damage Constitutive Model of Granite Under Coupling of Temperature and Dynamic Loading

Wang, Z. L.; Shi, Heng; Wang, J. G.

doi:10.1007/s00603-018-1523-0

Cited by 89 publications

(37 citation statements)

References 25 publications

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“…In terms of mechanical properties, most laboratory tests focus on stress-strain relationships [30], strength characteristics [9,17,19,20,[31][32][33] (such as uniaxial compressive strength (UCS), tensile strength, confined compressive strength, etc. ), deformation characteristics [17,19,[34][35][36][37] (such as elastic modulus, Poisson's ratio, peak strain, shear-slip strain, brittle stress drop coefficient, etc. ), damage evolution characteristics [38][39][40][41][42][43] (can be calculated by P-wave velocity, acoustic emission, cracks, etc.…”

Section: Introductionmentioning

confidence: 99%

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

et al. 2019

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In deep geoengineering, including geothermal development, deep mining, and nuclear waste geological disposal, high temperature significantly affects the mineral properties of rocks, thereby changing their porous and mechanical characteristics. This paper experimentally studied the changes in mineral composition, pore structure, and mechanical characteristics of pyroxene granite heated to high temperature (from 25 °C to 1200 °C). The results concluded that (1) the high-temperature effect can be roughly identified as three stages: 25–500 °C, 500–800 °C, 800–1200 °C. (2) Below 500 °C, the maximum diffracted intensities of the essential minerals are comparatively stable and the porous and mechanical characteristics of granite samples change slightly, mainly due to mineral dehydration and uncoordinated thermal expansion; additionally, the failure mechanism of granite is brittle. (3) In 500–800 °C, the diffraction angles of the minerals become wider, pyroxene and quartz undergo phase transitions, and the difference in thermal expansion among minerals reaches a peak; the rock porosity increases rapidly by 1.95 times, and the newly created pores caused by high heat treatment are mainly medium ones with radii between 1 μm and 10 μm; the P-wave velocity and the elastic modulus decrease by 62.5% and 34.6%, respectively, and the peak strain increases greatly by 105.7%, indicating the failure mode changes from brittle to quasi-brittle. (4) In 800–1200 °C, illite and quartz react chemically to produce mullite and the crystal state of the minerals deteriorate dramatically; the porous and mechanical parameters of granite samples all change significantly and the P-wave, the uniaxial compressive strength (UCS), and the elastic modulus decrease by 81.30%, 81.20%, and 92.52%, while the rock porosity and the shear-slip strain increase by 4.10 times and 11.37 times, respectively; the failure mechanism of granite samples transforms from quasi-brittle to plastic, which also was confirmed with scanning electron microscopy (SEM).

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Section: Introductionmentioning

confidence: 99%

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

et al. 2019

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“…(15) In general, the variable F for damage measure is directly regarded as the strain (Wang et al, 2018). However, the distribution of the failed mesoscopic elements cannot be precisely represented only by the uniaxial stress or strain (Liu et al, 2018).…”

Section: Statistical Damage Constitutive Model and Parameter Analysismentioning

confidence: 99%

Constitutive model of water-saturated marble under coupling effects of uniaxial impact compressive loading and low-temperature

Li¹

2020

Acta Geodynamica Et Geomaterialia

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The study of the mechanical properties of frozen rock is a basic problem that humans have to face in artificial low-temperature rock engineering and cold region rock engineering. There are few literatures on the dynamic constitutive models of frozen rocks under low-temperature gradients at home and abroad. In this paper, the constitutive model of water-saturated marble under the coupling effects of uniaxial impact compressive load and low-temperature is studied by theoretical analysis and experimental verification. Based on the theory of mechanical element combination, a rock constitutive model considering strain rate effect, damage softening effect and low-temperature effect is established, and the model parameters are determined by fitting method. The dynamic stress-strain curve of water-saturated marble at-30 ℃ is predicted. The predicted results are in good agreement with the experimental results and the concordance correlation coefficient is 0.984092. The relevant results of this paper can provide a theoretical reference for the excavation and protection of rock engineering under negative temperature.

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“…In the research of measuring the damage degree of rock materials, Kachanov [16] first proposed the use of continuity to describe the damage variable of rock. On the basis of continuity, Rabotnov [17,18] proposed a damage factor to describe the damage degree of rock. In other words, the ratio of the cross-section area of micro-defects on the rock sample to the cross-sectional area of rock sample was used to define the damage degree of rock samples.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Damage in Lignite under Combined Cyclic Compression and Shear Loading

Bai

Chen

et al. 2020

Sustainability

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In this paper, uniaxial cyclic compression and shear test was carried out for lignite samples. The effects of inclination angle (θ) and upper limit of cyclic stress (σmax) on mechanical properties of coal samples were analyzed, and the damage variables of coal samples were studied based on energy dissipation theory. The results show that the uniaxial compressive strength (UCS) of coal samples after uniaxial cyclic compression and shear tests decreases with the increase of the upper limit of cyclic stress and inclination angle. The shear stress component generated by the increase of inclination angle can effectively reduce the UCS and increase the damage degree of coal samples. With the increase of inclination angle, the failure mode of coal samples is changed from tensile failure (θ = 0°), the combined tensile failure and shear failure (θ = 5°) to shear failure (θ = 10°). The peak axial and radial strain of coal samples first increases rapidly and then stagnates. The peak volume strain rapid increases and then stagnates (θ = 0° and θ = 5°). When the inclination angle is 10°, the peak volume strain first decreases rapidly and then stagnates. Even if the upper limit of cyclic stress is lower than its UCS, it will still promote the propagation of micro cracks and the generation of new cracks and increase the internal damage of coal samples. With the increase of the cycle number, damage variables of coal samples after uniaxial cyclic compression and shear tests nonlinearly increase, and the growth rate decreases gradually.

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Mechanical Behavior and Damage Constitutive Model of Granite Under Coupling of Temperature and Dynamic Loading

Cited by 89 publications

References 25 publications

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

Mineral Composition, Pore Structure, and Mechanical Characteristics of Pyroxene Granite Exposed to Heat Treatments

Constitutive model of water-saturated marble under coupling effects of uniaxial impact compressive loading and low-temperature

Mechanical Properties and Damage in Lignite under Combined Cyclic Compression and Shear Loading

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