Influences of Mineralogy and Water Content on the Mechanical Properties of Argillite

Hu, Dawei; Zhang, Fan; Shao, Jian‐Fu; Gatmiri, Behrouz

doi:10.1007/s00603-013-0413-8

Cited by 58 publications

(9 citation statements)

References 24 publications

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“…Specimens with higher calcite content and smaller clay content extracted from layers deeper than that of the Bure URL are stiffer and stronger. 21 Ref. 7 also showed that the Young modulus increased with larger calcite content and decreased with larger clay fraction.…”

Section: Shear Strength and Thermal Effects In The Cox Claystonementioning

confidence: 84%

The thermo-mechanical behaviour of the Callovo-Oxfordian claystone

Menaceur

Delage

Tang

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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International audienceThe Callovo-Oxfordian (COx) claystone is considered as a potential host rock in the French concept of high level radioactive waste disposal at great depth. To better understand and to complement existing published data on the thermo-hydro-mechanical behaviour of the COx claystone, an experimental program was carried out using a hollow cylinder triaxial device specially developed for low permeability materials. Special care was devoted to the saturation of the specimens that was made under stress conditions close to in-situ, and to conditions ensuring full drainage thanks to a reduced drainage length and low shear rate. Tests were carried out under in-situ, half to in-situ and twice the Terzaghi mean effective in-situ stress at 25 °C and 80 °C to investigate the effects in the close field of the temperature elevation due to the exothermic nature of the waste. Some radial permeability tests were also conducted at various temperatures. The data obtained showed that there is little effect of temperature on the elastic parameters determined, whereas a tendency to a decrease in shear strength was noted, in accordance with the few available published data. Temperature also appeared to have little effect on the intrinsic permeability, with higher flows mainly due to the decrease in water viscosity. & 2015 Published by Elsevier Ltd

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Section: Shear Strength and Thermal Effects In The Cox Claystonementioning

confidence: 84%

The thermo-mechanical behaviour of the Callovo-Oxfordian claystone

Menaceur

Delage

Tang

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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“…Increase in porosity results in density decrease of a rock. Porosity depends on voids in the rock and is also affected by various processes during the rock formation and post-crystallization conditions (dissolution and recrystallization) (Tugrul, 2004;Molina et al, 2011;Hu et al, 2014).…”

Section: Implications Of Rock Textures To Rock Mechanicsmentioning

confidence: 99%

Petrographic features as an effective indicator for the variation in strength of granites

Sajid

Coggan

Arif

et al. 2016

Engineering Geology

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The important textural features include average grain size of rock, grain boundary recrystallization, maximum grain size of major rock forming minerals, mean grain size of cleaved minerals, mineral exsolution and variation of grain size within a rock. The petrographic observations, however, are more effective to describe the strength variation of granites having analogous weathering grade as change in degree of weathering has a dominant effect on rock mechanics.

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“…The results give the implications that the desaturation and resaturation would exert influences on its surroundings in the underground repositories. Hu et al [25] studied the anisotropic mechanical behavior, the Biot coefficient, and permeability coefficient caused by the development of microcrack tendency through complex cyclic loading and unloading tests on brittle rocks. Su et al [26] obtained the conclusion that during the triaxial cyclic loading and unloading test, the deformation of coal sample showed obvious memory characters, and the elastic modulus increased slightly with the increase of the cyclic series.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Stress-Seepage Coupling Properties of Sandstone under Different Loading Paths

et al. 2021

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The study on hydromechanical coupling properties of rocks is of great importance for rock engineering. It is closely related to the stability analysis of structures in rocks under seepage condition. In this study, a series of conventional triaxial tests under drained condition and hydrostatic compression tests under drained or undrained condition on sandstones were conducted. Moreover, complex cyclic loading and unloading tests were also carried out. Based on the experimental results, the following conclusions were obtained. For conventional triaxial tests, the elastic modulus, peak strength, crack initiation stress, and expansion stress increase with increased confining pressure. Pore pressure weakened the effect of the confining pressure under drained condition, which led to a decline in rock mechanical properties. It appeared that cohesion was more sensitive to pore pressure than to the internal friction angle. For complex loading and unloading cyclic tests, in deviatoric stress loading and unloading cycles, elastic modulus increased obviously in first loading stage and increased slowly in next stages. In confining pressure loading and unloading cycles, the Biot coefficient decreased first and then increased, which indicates that damage has a great impact on the Biot coefficient.

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Influences of Mineralogy and Water Content on the Mechanical Properties of Argillite

Cited by 58 publications

References 24 publications

The thermo-mechanical behaviour of the Callovo-Oxfordian claystone

The thermo-mechanical behaviour of the Callovo-Oxfordian claystone

Petrographic features as an effective indicator for the variation in strength of granites

Experimental Study of Stress-Seepage Coupling Properties of Sandstone under Different Loading Paths

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