The effect of specimen shape and strain rate on uniaxial compressive behavior of rock material

Liang, Changyu; Zhang, Qianbing; Li, X.; Peng, Xin

doi:10.1007/s10064-015-0811-0

Cited by 62 publications

(13 citation statements)

References 26 publications

(31 reference statements)

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“…The energy level under the static load and deflection graphs which was found to be lower than energy levels obtained with the Charpy impact test for all rock materials tested in this study confirms that energy consumption for crack propagation increases with an increase in loading rate [16][17][18][19]. The crack propagation time increasing with a decrease in the loading rate is accepted to be a reason for the issue of measuring energy level under static load to be lower than those obtained from the impact test [20][21][22].…”

Section: Resultssupporting

confidence: 61%

An Experimental Study on Determination of Crack Propagation Energy of Rock Materials under Dynamic (Impact) and Static Loading Conditions

Komurlu

2019

Hittite J. Sci. Eng.

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D etermination of the fracture toughness of rock materials can be carried out under different conditions of static and dynamic loads, by following various testing methods suggested by different researchers, standards and International Society of Rock Mechanics and Rock Engineering [1-10]. Although there are numerous researches to get deeper to identify the fracture mechanics of rock materials under cyclic (dynamic) loading and better understand the differences in behaviour of fracturing under cyclic and static loads, it is still a need to focus on more and suggest a standard testing method for determination of fracture toughness of rock materials being exposed to impact load, another type of dynamic loading induced in various rock engineering applications. Rock fracture toughness values under the impact loading condition are key parameters for various rock engineering applications such as percussion drilling, use

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Section: Resultssupporting

confidence: 61%

An Experimental Study on Determination of Crack Propagation Energy of Rock Materials under Dynamic (Impact) and Static Loading Conditions

Komurlu

2019

Hittite J. Sci. Eng.

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“…This system has two controlling modes during test and can record data simultaneously. According to Liang et al [39], the uniaxial compressive strength increases as loading rate increases and the recommended loading strain rate is from 10 −5 to 10 −3 s −1 . Therefore, in this study, displacement control mode with a constant speed of 0.002 mm/s was selected.…”

Section: Pj Coal Minementioning

confidence: 99%

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Liu

et al. 2020

Energies

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Coal burst is a type of dynamic geological hazard in coal mine. In this study, a modified bursting energy index, which is defined as the ratio of elastic strain energy at the peak strength to the released strain energy density at the post-peak stage, was proposed to evaluate the coal burst proneness. The calculation method for this index was also introduced. Two coal mines (PJ and TJH coal mines) located in Ordos coalfield were used to verify the validity of the proposed method. The tests results indicate that modified bursting energy index increases linearly with increasing uniaxial compressive strength. The parameter A, which is used to fit relation between total input and elastic strain energy density, has a significant effect on the modified bursting energy index. A large value of parameter A means more elastic strain energy before the peak strength while a small value indicates most of input energy was dissipated. Finally, the coal burst proneness of these two coal mines was evaluated with the modified index. The results of modified index are consistent with that of laboratory tests, and more reasonable than that from original bursting energy index because it removed the dissipated strain energy from the total input strain energy density.

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“…As a rule, the length-to-diameter ratio (D � length/diameter) for a cylindrical specimen or the height-to-width ratio for a plane strain specimen is regarded as slenderness ratio [22], and the analytical methods for shape effect can be divided into three categories: statistical theories based on Weibull theories, empirical and semiempirical models, and theories based on fracture mechanics [23]. Much of the research has been based on specimens of nonstandard dimensions and shapes and over a limited size range as summarized by Liang et al [24]. Masooumi et al [12] proposed a multiaxial failure criterion for intact rock incorporating shape effect and found some parameters in the criterion are shape-dependent.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Energy Evolution of Sandstone considering Slenderness Ratio Effect

Dai

Xingdong

Zhang

et al. 2020

Advances in Civil Engineering

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To study the influence of slenderness ratio effect on the mechanical behavior, acoustic emission properties, and energy evolution of sandstone, the uniaxial compression tests coupled with acoustic emission technology are carried out at different slenderness ratios D (0.5, 1.0, 1.5, 2.0, 3.0). The results show that a logarithmic function relationship is observed between the peak strength, the peak strain, and the elastic modulus with slenderness ratio. The failure patterns of the tested sandstone varied significantly with the increasing slenderness ratio. When the slenderness ratio, D, is lower than 1.5, complex failures and multiple shear planes are formed, while simple failures and single shear planes are generated at D larger than 1.5. Besides, the AE ringing counts are more obvious with a higher slenderness ratio, D, at the initial compression stage due to the greater body volume and more defects in the sandstone. The energy evolution curves and energy ratio distribution curves can be divided into four stages, corresponding to the stress-strain curves.

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The effect of specimen shape and strain rate on uniaxial compressive behavior of rock material

Cited by 62 publications

References 26 publications

An Experimental Study on Determination of Crack Propagation Energy of Rock Materials under Dynamic (Impact) and Static Loading Conditions

An Experimental Study on Determination of Crack Propagation Energy of Rock Materials under Dynamic (Impact) and Static Loading Conditions

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Mechanical Behavior and Energy Evolution of Sandstone considering Slenderness Ratio Effect

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