An SHPB Test Study on Stress Wave Energy Attenuation in Jointed Rock Masses

Li, J. C.; Rong, L. F.; Li, H. B.; Hong, Shengnan

doi:10.1007/s00603-018-1586-y

Cited by 120 publications

(33 citation statements)

References 21 publications

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“…The results show that the thickness and moisture content of the filling sand have great influence on the dynamic mechanical properties of the joint. Li et al (2019) used SHPB test system to conduct uniaxial impact tests on granite samples containing artificial joints, and studied the influence of joint matching coefficient (JMC) on the quality factors of rock samples. In addition, considering factors such as joint distribution Angle, joint contact, joint number, joint spacing and length-diameter ratio of specimens, some researchers (e.g., Wu et al, 2013Wu et al, , 2014Wu and Zhao, 2015;Liu and Su, 2016;Amalokwu et al, 2016) conducted dynamic impact compression tests on different types of rock joints and obtained the dynamic mechanical properties of the samples.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Chai

Wang

et al. 2020

Lat. Am. j. solids struct.

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The static and dynamic compression mechanical properties of the prefabricated artificial filled rock joints specimens with different fillings and different joint thicknesses are tested, respectively. Then, the strength, deformation, wave propagation and energy dissipation laws of the filled joints are analyzed. The experimental results show that the static and dynamic compression strength of filled joints increases with the strength of filling materials while decreases with the filling thickness. The deformation characteristics of filled joints under static and dynamic compression are positively correlated with the properties of filling materials and the thickness of filled joints. With the increasing of the filling thickness, the reflection coefficient increases while the transmission coefficient decreases. With the increase of the strength of the fillings, the reflection coefficient decreases while the transmission coefficient increases. The energy dissipation ratio decreases with the increase of the filliing thickness and increases with the increase of the strength of the filling material.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Chai

Wang

et al. 2020

Lat. Am. j. solids struct.

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“…On the other hand, rock materials are often subjected to dynamic loads, such as impact, blasting, and vibration, and the Split Hopkinson pressure bar (SHPB) has become a common device used for studying the dynamic failure of rocks under high loading rates or strain rate. [3,[6][7][8][9] e study of dynamic tensile properties of rock materials by using the Brazilian disc test has attracted many researchers' attention. Gong and Zhao [6] put forward a DIF (dynamic increase factor) model to describe the dynamic tensile properties of sandstone in the range of low loading rate to the high loading rate.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Gong

2020

Advances in Civil Engineering

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In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. The states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. The results show that the ruptured state of the specimen corresponds to the critical failure strain. Taking the critical incident energy as a turning point, two positive linear fitting relations between the dissipated energy and incident energy before and after the point are obtained, and the dynamic linear dissipation law is found. When the incident energy is less than the critical energy, specimens were unruptured after impact. When the incident energy is greater than the critical energy, specimens will be broken after impact. According to the obtained linear energy dissipation law, the dynamic tensile energy dissipation coefficient (DTEDC) was introduced for quantitatively describing the dynamic energy dissipation capacity of rock materials in the dynamic Brazilian disc test. When the specimen is in the unruptured state, the ideal DTEDC is a constant value. When the specimen is in a broken state, the DTEDC increases with the increase of incident energy.

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“…The dynamic effect on energy dissipation is fundamentally reflected by the combined action of stress and strain of the coal specimen. During the entire process of dynamic loading and unloading, the energy carried by incident, reflected, and transmitted waves is expressed as :

({, \begin{matrix} E_{i} = \frac{A_{b} C_{b}}{E_{b}} \int σ_{i}^{2} d t = A_{b} E_{b} C_{b} \int ε_{i}^{2} d t \\ E_{r} = \frac{A_{b} C_{b}}{E_{b}} \int σ_{r}^{2} d t = A_{b} E_{b} C_{b} \int ε_{r}^{2} d t \\ E_{t} = \frac{A_{b} C_{b}}{E_{b}} \int σ_{t}^{2} d t = A_{b} E_{b} C_{b} \int ε_{t}^{2} d t \end{matrix})

where E i , E r , and E t are the incident energy, reflected energy, and transmitted energy, respectively, kJ; σ i , σ r , and σ t are the stresses corresponding to the incident, reflected, and transmitted waves in the pressure bar, respectively, MPa.…”

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Strain Rate On Energy Dissipation Characteristicsmentioning

confidence: 99%

Experimental investigation on dynamic strength and energy dissipation characteristics of gas outburst‐prone coal

Fan

Elsworth

et al. 2019

Energy Science & Engineering

113

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We report laboratory experiments to investigate the dynamic failure characteristics of outburst‐prone coal using a split Hopkinson pressure bar (SHPB). For comparison, two groups of experiments are completed on contrasting coals—the first outburst‐prone and the second outburst‐resistant. The dynamic mechanical properties, failure processes, and energy dissipation of both outburst‐prone and outburst‐resistant coals are comparatively analyzed according to the obtained dynamic compressive and tensile stress‐strain curves. Results show that the dynamic stress‐strain response of both outburst‐prone and outburst‐resistant coal specimens comprises stages of compression, linear elastic deformation, then microfracture evolution, followed by unstable fracture propagation culminating in rapid unloading. The mechanical properties of both outburst‐prone and outburst‐resistant coal specimens exhibit similar features: The uniaxial compressive strength and indirect tensile strength increase linearly with the applied strain rate, and the peak strain increases nonlinearly with the strain rate, whereas the elastic modulus does not exhibit any clear strain rate dependency. Differences in the dynamic failure characteristics between outburst‐prone and outburst‐resistant coals also exist. The hardening effect of strain rate on outburst‐prone coal is more apparent than on outburst‐resistant coal, which is reflected in the dynamic increase factor at the same strain rate. However, the dynamic strength of outburst‐prone coals is still lower than that of outburst‐resistant coals due to its low quasi‐static strength. The dissipated energy of outburst‐prone coal is smaller than that of outburst‐resistant coal. Therefore, the outburst‐prone coal, characterized by low strength, high deformability, and small energy dissipation when dynamically loaded to failure, is more favorably disposed to the triggering and propagation of gas outbursts.

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An SHPB Test Study on Stress Wave Energy Attenuation in Jointed Rock Masses

Cited by 120 publications

References 21 publications

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Experimental Study on Static and Dynamic Compression Mechanical Properties of Filled Rock Joints

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Experimental investigation on dynamic strength and energy dissipation characteristics of gas outburst‐prone coal

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