Thermo-mechanical properties of Indian and other granites

Dwivedi, R.; Goel, Ramesh; Prasad, V.V.R.; Sinha, A.

doi:10.1016/j.ijrmms.2007.05.008

Cited by 295 publications

(113 citation statements)

References 26 publications

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“…Nevertheless, for a more detailed analysis, it is observed that UCS increased slightly with the increasing temperatures. Similar observations have been reported in [39,40]. In [40], based on the SEM technique, micro-cracks have been observed in Indian granite under various temperatures ranging from 30 °C-160 °C.…”

Section: Thermal Effect On the Mechanical Properties Of Nrg01 Granitesupporting

confidence: 85%

Geomechanical Studies on Granite Intrusions in Alxa Area for High-Level Radioactive Waste Disposal

Cheng

Xiao

et al. 2016

Sustainability

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Geological storage is an important concept for high-level radioactive waste (HLW) disposal, and detailed studies are required to protect the environment from contamination by radionuclides. This paper presents a series of geomechanical studies on the site selection for HLW disposal in the Alxa area of China. Surface investigation in the field and RQD analyses on the drill cores are carried out to evaluate the rock mass quality. Laboratory uniaxial and triaxial compressive tests on the samples prepared from the drill cores are conducted to estimate the strength properties of the host rock. It is found that the NRG sub-area has massive granite intrusions, and NRG01 cored granite samples show the best rock quality and higher peak strength under various confinements (0-30 MPa). NRG01 granite samples are applied for more detailed laboratory studies considering the effects of strain rate and temperature. It is observed that the increasing strain rate from 1.0 × 10 −5 -0.6 × 10 −2 ·s −1 can lead to a limited increase on peak strength, but a much more violent failure under uniaxial compressive tests on the NRG01 granite samples, and the temperature increasing from 20 • C-200 • C may result in a slight increase of UCS, as well as more ductile post-peak behavior in the triaxial compressive tests.

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Section: Thermal Effect On the Mechanical Properties Of Nrg01 Granitesupporting

confidence: 85%

Geomechanical Studies on Granite Intrusions in Alxa Area for High-Level Radioactive Waste Disposal

Cheng

Xiao

et al. 2016

Sustainability

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“…Dwivedi et al (2008) reported that at 100 °C a 4% increase, and at 160 °C a 13% increase, were measured as compared to samples at 30 °C.…”

Section: Uniaxial Compressive Strengthmentioning

confidence: 99%

“…According to the Dwivedi et al (2008) Young's modulus shows variable trend until it Fig. 8 Compressive strength of granites as a function of temperature reaches a peak at 300 °C; at higher temperatures it starts to decrease strongly.…”

Section: Young's Modulusmentioning

confidence: 99%

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The effect of temperature on the strength of two different granites

Török

2015

Central European Geology

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The paper provides information on the mechanical properties of granitic rocks that were subjected to heat. Two types of granitic rocks were tested under laboratory conditions at temperatures of 23 °C, 300 °C and 600 °C. The granitic rock from Bátaapáti (Mórágy Granite) is a pinkish leucocratic monzogranitic type while the second type is grey granite from Mauthausen (Austria). The samples were placed in furnace and temperature raised to 300 °C. Other set of samples were heated to 600 °C. Mechanical tests were performed on non-heated and heated samples and the test results were compared. Heating to 300 °C caused a slight increase in the uniaxial compressive strength and in indirect tensile strength, with reference to the samples kept at 23 °C. A drastic drop in both values was observed when samples were heated to 600 °C. The density of the samples did not show a major change up to 300 °C. On the contrary, a decrease in ultrasonic pulse velocity was observed, with an additional significant loss when samples subjected to 600 °C were compared to the reference samples of 23 °C. This decrease can be related to the initiation of micro-cracks. With increasing temperature the Young modulus of both granites was reduced.

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“…The behavior of rock at high temperatures has been studied extensively. Decrease in the tensile strength of rock by increasing temperature has been reported by several researchers [5,12]. Mahanta et al [13] studied the effect of temperature on the mode I fracture toughness of three different Indian rocks.…”

Section: Introductionmentioning

confidence: 92%

Experimental study of the dynamic indentation damage in thermally shocked granite

Mardoukhi¹,

Hokka²,

Kuokkala³

2018

RakMek

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Summary. This paper presents an experimental procedure to study the effects of pre-existing cracks and damage on the rock behavior under dynamic indentation. To gain better understanding on the mechanism involved in percussive-rotary drilling procedure, a modified Split Hopkinson Pressure Bar device was used to carry out dynamic indentation tests, where rock drill buttons were impacted on rock samples with dimensions of 30 cm × 30 cm × 30 cm. Before the mechanical testing, the samples were thermally shocked using a plasma spray gun for periods of 3, 4, and 6 seconds. The plasma gun produces a powerful heat shocks on the rock sample, and even short exposures can change the surface structure of the samples and provide samples with different crack patterns and surface roughness for experimental testing. The effects of the heat shock damage on the dynamic indentation behavior of the rock were characterized with singleand triple-button indentation tests. The specific destruction work was used to characterize the effects of heat shocks on the material removal during dynamic indentation. The results show that the force-displacement response of the rock does not change much even if the rock surface is severely damaged by the heat shock, however, the destruction work decreases significantly. This means that the same loading removes more volume if the material surface is pre-damaged, and that the efficiency of the indentation process cannot be evaluated from the bit-rock interaction forces alone. The presented experimental framework can be a useful tool for the verification of numerical models where the rock microstructure and especially the microcracks are essential.

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Thermo-mechanical properties of Indian and other granites

Cited by 295 publications

References 26 publications

Geomechanical Studies on Granite Intrusions in Alxa Area for High-Level Radioactive Waste Disposal

Geomechanical Studies on Granite Intrusions in Alxa Area for High-Level Radioactive Waste Disposal

The effect of temperature on the strength of two different granites

Experimental study of the dynamic indentation damage in thermally shocked granite

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