Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

Hokka, Mikko; Black, John T.; Tkalich, Dmitry; Fourmeau, Marion; Kane, Alexander; Hoang, Nguyen-Hieu; Li, C.C.; Chen, W.W.; Kuokkala, Veli‐Tapani

doi:10.1016/j.ijimpeng.2016.01.010

Cited by 164 publications

(42 citation statements)

References 34 publications

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“…The dependency of the rock strength on the strain rate is a widely reported topic in the literature 4 . In addition, the combined effect of the strain rate and confining pressure is an important and challenging aspect in rock mechanics and mining sciences 6 . However, the range of strain rates involved in percussive drilling is often considered small 7 and can be obtained by complementary dynamic laboratory tests 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of Kuru granite under confined compression and indentation

Tkalich

Fourmeau

Kane

et al. 2016

International Journal of Rock Mechanics and Mining Sciences

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of Kuru granite under confined compression and indentation

Tkalich

Fourmeau

Kane

et al. 2016

International Journal of Rock Mechanics and Mining Sciences

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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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“…Rock masses are generally in a triaxial stress state; thus, it is necessary to study the influence of confining pressure on the strength of rock mass . In this study, triaxial tests were carried out on specimens with different damage degree caused by different simulated mining disturbances.…”

Section: Mechanical Response Properties Of Roof Strata By Different Mmentioning

confidence: 99%

“…Rock masses are generally in a triaxial stress state; thus, it is necessary to study the influence of confining pressure on the strength of rock mass. 27,28 In this study, triaxial tests were carried out on specimens with different damage degree caused by different simulated mining disturbances. The confining pressure (σ 3 ) was increased successively with a gradient of 5 MPa, and the corresponding strength of specimens can be obtained successively.…”

Section: The Effect Of Confining Pressure On the Strength Of Rock Smentioning

confidence: 99%

Development characteristics and field detection of overburden fracture zone in multiseam mining: A case study

Tian

Liu

Yang

et al. 2019

Energy Science & Engineering

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During the multiseam mining process, the overlying strata were damaged due to different mining disturbances, where a large number of fractures were produced which were the main seepage paths of gas and water, easy to cause gas or water inrush accidents. Thus, it is necessary to explore the development characteristics of the fractured zone in the overlying strata from multiseam mining. In this paper, laboratory triaxial compression tests were firstly conducted on the rock specimens subjected to different mining disturbances. In these tests, the specimen was loaded to different stress before a regular test to simulate the different damage effects on the rock strata caused by different mining disturbances. And the corresponding values of m and s could be obtained through a calculation based on the test results. Subsequently, the numerical simulation was conducted to simulate the field situation, in which the m and s values were used in the numerical model combined with the Hoek‐Brown–modified criterion, and the results show that the overburden failure height was increased with the mining disturbances from 48 to 120 m, and then, the effects of mining height and interval thickness on the development height of fracture zone were studied by numerical simulation. Finally, the leakage of roof drilling at different stages was tested and calculated in the field. The results showed that the loss of leakage drilling can directly reflect the development degree of roof cracks, and the detection results were close to the development height of the numerical simulation fracture zone. It is verified that the simulation method used in this paper is feasible and can be used as a reference for similar research.

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Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

Cited by 164 publications

References 34 publications

Experimental and numerical study of Kuru granite under confined compression and indentation

Experimental and numerical study of Kuru granite under confined compression and indentation

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

Development characteristics and field detection of overburden fracture zone in multiseam mining: A case study

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