Effects of loading rate and temperature on tensile strength and deformation of rock salt

Sopon, Wisetsaen; Walsri, Chaowarin; Fuenkajorn, Kittitep

doi:10.1016/j.ijrmms.2014.10.005

Cited by 43 publications

(13 citation statements)

References 20 publications

(29 reference statements)

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“…Unfortunately, however, creating the exact environment of these applications in the laboratory is difficult due to the large scale of samples and equipment required to carry out the tests. The rock itself as a material further complicates the testing since its behavior depends on many factors, such as chemical composition [25], structure [26], texture [37], and grain size [34] alongside testing condition parameters such as temperature [7,11,35,39,41], confining pressure [14], specimen size, etc. [6,9,13,18,17,32].…”

mentioning

confidence: 99%

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

Mardoukhi

Saksala²,

Hokka³

et al. 2017

RakMek

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Summary. This paper presents a numerical and experimental study on the mechanical behavior of plasma shocked rock. The dynamic tensile behavior of plasma shock treated Balmoral Red granite was studied under dynamic loading using the Brazilian disc test and the Split Hopkinson Pressure Bar device. Different heat shocks were produced on the Brazilian disc samples by moving the plasma gun over the sample at different speeds. Microscopy clearly showed that as the duration of the thermal shock increases, the number of the surface cracks and their complexity increases (quantified here as the fractal dimension of the crack patterns) and the area of the damaged surface grows larger as well. At the highest thermal shock duration of 0.80 seconds the tensile strength of the Brazilian disc sample drops by approximately 20%. In the numerical simulations of the dynamic Brazilian disc test, this decrease in tensile strength was reproduced by modeling the plasma shock induced damage using the embedded discontinuity finite element method. The damage caused by the plasma shock was modeled by two methods, namely by pre-embedded discontinuity populations with zero strength and by assuming that the rock strength is lowered and conform to the Weibull distribution. This paper presents a quantitative assessment of the effects of the heat shock, the surface microstructure and mechanical behavior of the studied rock, and a promising numerical model to account for the pre-existing crack distributions in a rock material.

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confidence: 99%

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

Mardoukhi

Saksala²,

Hokka³

et al. 2017

RakMek

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“…where A, B, and C are parameters obtained from the conventional triaxial compression test and T is the temperature. From equations (7) and (8), the damage variable equation for rocks under the coupled effect of temperature and stress is obtained, which is written as…”

Section: Rheological Constitutive Analysis Of Thermalmentioning

confidence: 99%

“…Zhu and Arson [7] studied thermomechanical crack opening and closure in rocks and proposed a thermomechanical damage model without considering time effect. Wisetsaen et al [8] probed into the effect of temperature and loading rate on the tensile strength of rock salt. Sun et al [9] reported the change of thermal conductivity coefficient, thermal diffusion coefficient, and thermal capacity of sandstone after high-temperature treatment and found that four stages in the variation of thermal parameters with temperature: from room temperature to 200°C, 200°C-400°C, 400°C-600°C, and above 600°C.…”

Section: Introductionmentioning

confidence: 99%

Modified Nishihara Rheological Model considering the Effect of Thermal-Mechanical Coupling and Its Experimental Verification

Wang

Huang

Lian

et al. 2018

Advances in Materials Science and Engineering

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The effect of temperature and pressure, which play important roles in the mechanical properties of rocks during deep energy exploitation, has not been sufficiently studied in the previous rock creep models. In order to investigate thermal effect in creep models, a modified Nishihara rheological model, taking into account the coupled effect of thermal damage and stress, was proposed by combining the theoretical formula for thermal damage of rocks with the modified Nishihara model. The improved model introduces a nonlinear viscous dashpot, which can accurately describe the accelerated rheological phase of rocks. To verify the proposed model, a triaxial rheological experiment was conducted on sandstone subjected to thermal damage (600°C). In addition, the stress-strain curves within whole creep process of the rheological experiment were analyzed. Furthermore, the theoretical curves of the modified Nishihara rheological model were compared with the experimental results. Results showed that the theoretical curves relatively agree well with the experimental data, suggesting that the proposed new model is more preferred to describing the rheological curve of sandstone subjected to thermal damage at different rheological stages, in particular, it is capable of depicting the accelerated rheological stage of the sandstone, providing a good ability to describe the creep behavior of rocks under thermal-mechanical coupling.

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“…Evidently, there exists an excavation depth of gas-saturated coal beds, which is the most hazardous with respect to the crack growth and outbursts. In summary, it can be stated that the criterion inequality (18) indicating the jump-like growth of a crack is a generalization of Griffith's criterion in the case where the breaking stresses are generated by a gas contained in the crack cavity. As for the relative increment of the crack size, it increases with the value of 0 : when the formational pressure increases, the modulus of cohesion decreases, the gap increases, and the unloading decreases.…”

mentioning

confidence: 99%

“…If the unloading is maximal and equals , the same criterion (18) is easily derived from the inequality 2 1 √ 0 > . To satisfy the criterion of crack chambering (18), the validity of Griffith's criterion 0 > is necessary, but insufficient for an undisturbed bed. Moreover, for an unloaded bed, the parameter must be small enough.…”

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confidence: 99%

Kinetic Theory of the Fracture of the Coal (Rock) Edge by the Gas-Filled Cracks. Instantaneous Loading-Out

2019

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The kinetic theory of the fracture of brittle materials is applied to the study of undercritical and critical growths of cracks in gas-filled rocks. In this type of the materials, the gas filtration from the environment to the cavity of a growing crack plays an important role. The proper account for this factor combined with the dynamics of the stressed state of the bed allows the estimation of the rate of growth of the main crack on the assumption of the Griffith criterion validity. It is found that, immediately after the instantaneous loading-out of the bed in the course of excavation, the cracks of certain size and orientation are exploded with the succeeding growth dependent on the gas entry into the cracks. The time of the filtration growth of the cracks has been estimated. The intervals of the control parameters (formational gas pressure, crack size, overburden pressure, surface energy of coal/rock, modulus of elasticity), where the spontaneous fracture of the bed becomes possible, have been found. The results open a way to the forecast of instantaneous outbursts of coal, rock, and gas. K e y w o r d s: coal bed, gas-filled crack, filtration, outburst.

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Effects of loading rate and temperature on tensile strength and deformation of rock salt

Cited by 43 publications

References 20 publications

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

A numerical and experimental study on the tensile behavior of plasma shocked granite under dynamic loading

Modified Nishihara Rheological Model considering the Effect of Thermal-Mechanical Coupling and Its Experimental Verification

Kinetic Theory of the Fracture of the Coal (Rock) Edge by the Gas-Filled Cracks. Instantaneous Loading-Out

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