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

Tkalich, Dmitry; Fourmeau, Marion; Kane, Alexander; Li, C.C.; Cailletaud, Georges

doi:10.1016/j.ijrmms.2016.05.012

Cited by 51 publications

(26 citation statements)

References 26 publications

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“…When the pressure is higher than 20MPa and there's a low strain, confining pressure influence mechanical properties of rock mass more significantly. Tkalich [8] carried out a triaxial compression test of Kuru Gray granite under different confining pressure levels. He pointed out that the peak pressure under the confining pressure of 150MPa was increased by about 11% compared with that under no lateral confinement and shape of the equivalent stress field close to the free face of rocks was sensitive to confining pressure.…”

Section: State Of the Artmentioning

confidence: 99%

“…6. The fitting expression is (8) where is the elasticity modulus when the hydraulic pressure is , is the confining pressure, and a and b are regression coefficients. According to the fitting results, the fitting correlation coefficients exceed 0.94, thereby suggesting a relatively ideal fitting effect.…”

Section: Deformation Parameters (1) Change Characteristics Of Elasticmentioning

confidence: 99%

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Analysis on the Triaxial Loading Mechanical Properties of Sandstone under High Stress and High Hydraulic Pressure

Li¹,

Liu²,

He³

et al. 2019

JESTR

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The mechanical properties of deep rocks are highly sensitive to hydraulic pressures. The existing associated studies mainly focused on the mechanical properties of rocks under high stress, but few studies analyzed the collaborative influences of high stress and high hydraulic pressure on deep rocks. To analyze the special mechanical properties of deep rocks under high hydraulic pressure, sandstone samples were collected from a deep tunnel of the Yuanliangshan Line in Chongqing, China. All rock samples were saturated in vacuum conditions and then wrapped with oil in a specially made fluororubber cover. Then the confining pressure was loaded to 15, 25, 35, and 45 MPa at a loading rate of 1 MPa/min under hydrostatic pressure conditions. After reaching the preset confining pressure, the rock samples were resaturated in the experimental apparatus. The outlet pressure was maintained at a barometric pressure, while the inlet pressure was the preset hydraulic pressures of 1, 4, and 7 MPa, thus forming a one-way interstifial flow. A triaxial compression test was performed on the sandstone samples under high stress and high hydraulic pressure. Results demonstrate that under high stress, the compressive strength of sandstone decreases in the logarithmic function along with an increasing hydraulic pressure (p). A regression analysis was performed on the elasticity modulus of sandstone with an increasing confining pressure (σ3) and under different hydraulic pressures. Under different confining pressures, the elasticity modulus of sandstone decreases in logarithmic function along with an increasing hydraulic pressure. Meanwhile, under an increasing confining pressure, the sandstone samples shift from a brittle state to a ductile state. However, the brittleness of these samples is positively related with hydraulic pressure. The findings of this work provide references for analyzing the excavation-induced mechanical properties of deep rocks in tunnels under high hydraulic pressure.

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Section: State Of the Artmentioning

confidence: 99%

Section: Deformation Parameters (1) Change Characteristics Of Elasticmentioning

confidence: 99%

Analysis on the Triaxial Loading Mechanical Properties of Sandstone under High Stress and High Hydraulic Pressure

Li¹,

Liu²,

He³

et al. 2019

JESTR

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“…Among the material parameters summarized in table 2, 10 were calibrated on the experimental data presented in §2 and in [16] (E, ν, σ C , σ 3T , B, N, C,ε 0 , β, ε p f-MIN ), eight were taken from the literature (ρ, S max , use literature data for the remaining parameters, and to inverse calibrate the parameter that was mostly influencing the force versus displacement curve, namely ε p f-T . The elastic parameters E and ν are calibrated on the elastic part of axial stress versus axial and radial strain curves obtained for confined compression tests under quasi-static loading conditions [16].…”

Section: (B) Model Parameter Identification For Kuru Granitementioning

confidence: 99%

“…The elastic parameters E and ν are calibrated on the elastic part of axial stress versus axial and radial strain curves obtained for confined compression tests under quasi-static loading conditions [16]. The uniaxial compressive strength σ C is identified from the average peak load obtained for quasi-static uniaxial compression tests, also reported in [16]. The peak stresses obtained from the various confining pressure tests performed under quasi-static and dynamic loading conditions enable one to identify the pressure sensitivity parameters σ 3T , B and N, and the strain-rate sensitivity parameter C (the reference strain rateε 0 is chosen from quasistatic loading conditions).…”

Section: (B) Model Parameter Identification For Kuru Granitementioning

confidence: 99%

Experimental and numerical study of drill bit drop tests on Kuru granite

Fourmeau

Kane

Hokka

2017

Phil. Trans. R. Soc. A.

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One contribution of 15 to a theme issue 'Experimental testing and modelling of brittle materials at high strain rates'. This paper presents an experimental and numerical study of Kuru grey granite impacted with a sevenbuttons drill bit mounted on an instrumented drop test machine. The force versus displacement curves during the impact, so-called bit-rock interaction (BRI) curves, were obtained using strain gauge measurements for two levels of impact energy. Moreover, the volume of removed rock after each drop test was evaluated by stereo-lithography (threedimensional surface reconstruction). A modified version of the Holmquist-Johnson-Cook (MHJC) material model was calibrated using Kuru granite test results available from the literature. Numerical simulations of the single drop tests were carried out using the MHJC model available in the LS-DYNA explicit finite-element solver. The influence of the impact energy and additional confining pressure on the BRI curves and the volume of the removed rock is discussed. In addition, the influence of the rock surface shape before impact was evaluated using two different mesh geometries: a flat surface and a hyperbolic surface. The experimental and numerical results are compared and discussed in terms of drilling efficiency through the mechanical specific energy.This article is part of the themed issue 'Experimental testing and modelling of brittle materials at high strain rates'.

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“…The excess elastic energy W a of a the Kuru granite(Tkalich et al 2016) and b the Iddefjord granite under uniaxial compressionFig. 6 A hypothetical model for the formation of the final shear fracture in rock under a uniaxial loading and b triaxial loading…”

mentioning

confidence: 99%

Effects of Confining Stress on the Post-Peak Behaviour and Fracture Angle of Fauske Marble and Iddefjord Granite

Zhang

2018

Rock Mech Rock Eng

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

Cited by 51 publications

References 26 publications

Analysis on the Triaxial Loading Mechanical Properties of Sandstone under High Stress and High Hydraulic Pressure

Analysis on the Triaxial Loading Mechanical Properties of Sandstone under High Stress and High Hydraulic Pressure

Experimental and numerical study of drill bit drop tests on Kuru granite

Effects of Confining Stress on the Post-Peak Behaviour and Fracture Angle of Fauske Marble and Iddefjord Granite

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