Permeability of thermally cracked granite

Darot, M.; Guéguen, Yves; Baratin, Marie-Laure

doi:10.1029/92gl00579

Cited by 85 publications

(51 citation statements)

References 8 publications

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“…The decrease in permeability was due to the closure of inclined cracks by the elastic and viscous deformation enhanced by temperatureconfining-pressure coupling. Thermal elastic expansion of mineral particles can be another cause of further crack closure at 353 K [Darot et al, 1992]. The elastic deformations, however, was not observed in the thin-section images, because they were prepared after unloading.…”

Section: The Mechanisms Of Permeability Change By Consolidationmentioning

confidence: 97%

Fractured Rock Permeability as a Function of Temperature and Confining Pressure

Alam

Fujii

Fukuda

et al. 2015

Pure Appl. Geophys.

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Triaxial compression tests were carried out on Shikotsu welded tuff, Kimachi sandstone, and Inada granite under confining pressures of 1-15 MPa at 295 K and 353 K. The permeability of the tuff declined monotonically with axial compression. The post-compression permeability became smaller than that before axial compression.The permeability of Kimachi sandstone and Inada granite declined at first, and then 2 began to increase before the peak load, and showed values that were almost constant in the residual strength state. The post-compression permeability of Kimachi sandstone was higher than that before axial compression under low confining pressures, but lower under higher confining pressures. On the other hand, the permeability of Inada granite was higher than that before axial compression regardless of the confining pressure values. For the all rock types, the post-compression permeability at 353 K was lower than at 295 K and the influence of the confining pressure was less at 353 K than at 295 K. The above temperature effects were observed apparently for Inada granite, only the latter effect was apparent for Shikotsu welded tuff, and they were not so obvious for Kimachi sandstone. The mechanisms causing the variation in rock permeability, and sealability of underground openings were discussed. Key Points:The influence of confining pressure on permeability is less at 353 K than at 295 K.The flow speed at 353 K is nearly the same as at 295 K or significantly slower.Pore collapse, and plastic and viscous deformation are dominant mechanisms.

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Section: The Mechanisms Of Permeability Change By Consolidationmentioning

confidence: 97%

Fractured Rock Permeability as a Function of Temperature and Confining Pressure

Alam

Fujii

Fukuda

et al. 2015

Pure Appl. Geophys.

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“…Skoczylas & Henry, 1995). The importance of the issue in question (i.e., of the temperature-induced changes in rock permeability) has been repeatedly stressed by such authors as Heard and Page (1982), Vogele and Brace (1985), Darot et al (1992), Lin and Daily (1990), and Danek et al (2001). All of them also referred to the impact of thermal fractures on broadly defined filtration properties of a rock.…”

Section: Introductionmentioning

confidence: 99%

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

Nowakowski¹,

Młynarczuk²

2012

Archives of Mining Sciences

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Temperature is one of the basic factors influencing physical and structural properties of rocks. A quantitative and qualitative description of this influence becomes essential in underground construction and, in particular, in the construction of various underground storage facilities, including nuclear waste repositories. The present paper discusses the effects of temperature changes on selected mechanical and structural parameters of the Strzelin granites. Its authors focused on analyzing the changes of granite properties that accompany rapid temperature changes, for temperatures lower than 573ºC, which is the value at which the β -α phase transition in quartz occurs. Some of the criteria for selecting the temperature range were the results of measurements carried out at nuclear waste repositories. It was demonstrated that, as a result of the adopted procedure of heating and cooling of samples, the examined rock starts to reveal measurable structural changes, which, in turn, induces vital changes of its selected mechanical properties. In particular, it was shown that one of the quantities describing the structure of the rock -namely, the fracture network -grew significantly. As a consequence, vital changes could be observed in the following physical quantities characterizing the rock: primary wave velocity (v p ), permeability coefficient (k), total porosity (n) and fracture porosity (η), limit of compressive strength ( R σ 1 ) and the accompanying deformation ( R ε 1 ), Young's modulus (E), and Poisson's ratio (ν).Keywords: rock properties, rock structure, thermal load, cracks, sound wave velocity, porosity, permeability, compressive strength, Young modulus, Poisson ratio Wśród wielu czynników wpływających na właściwości fizyczne i strukturalne skał jednym z najważniejszych jest bez wątpienia temperatura. Jej podwyższenie lub obniżenie może prowadzić do zmian struktury, spowodować przemiany fazowe składników, zmieniać skład chemiczny a wreszcie, stan skupienia skały. Procesy te mogą więc w istotny sposób zmienić właściwości fizyczne skały, co jest istotne między innymi z punktu widzenia szeroko rozumianego budownictwa podziemnego. Zmiany temperatury skały mogą wynikać z warunków naturalnych, w jakich się ona znajduje lub być konsekwencją działalności człowieka. Szczególnym przypadkiem takiej działalności jest budowa różnego typu składowisk pod-

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“…0094-8276/00/1999GL008414505.00 Poitiers (W France) (Darot et al, 1992;Turpault, 1989); it is composed of 40% plagioclase, 26% Kfeldspar, 24% quartz and 10% biotite. Prior to Vp measurements, cracks were generated in the cores by means of a controlled thermal treatment at room pressure, which consisted in a slow heating (løC/min) up to a plateau temperature held for 30 minutes and next followed by a slow cooling (løC/min) down to room temperature.…”

Section: Paper Number 1999gl008414mentioning

confidence: 99%

“…The aim of the thermal pre-treatment is to generate different crack populations in the starting material. Previous work on La Peyratte granite (Darot et al, 1992) has shown that above 120øC, the induced residual thermal damage results in a progressive increase of the connected porosity and permeability. It has been shown that Vp depends on the intensity of the damage induced by the thermal treatment whereas Vp anisotropy was found to be very weak, if any in thermally treated samples Men6ndez et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Effect of pore and confining pressures on V_P in thermally pre‐cracked granites

Darot

Reuschlé

2000

Geophysical Research Letters

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Abstract. The acoustic P-waves velocity Vp is measured in a water saturated fine-grained granite as a function of pore pressure for a series of confining pressures ranging from 10 to 75 MPa. Prior to Vp measurements, different crack contents were generated in the granite specimens by means of controlled thermal pre-treatments at 450, 510, and 555øC. Vp variations are interpreted as resulting from crack behaviour evolution in response to imposed pressures. An effective pressure law with an effective pressure coefficient close to 0.9 is derived for Vp from a delimited pressure domain. This behaviour is interpreted in terms of crack deformation under pressure.

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Permeability of thermally cracked granite

Cited by 85 publications

References 8 publications

Fractured Rock Permeability as a Function of Temperature and Confining Pressure

Fractured Rock Permeability as a Function of Temperature and Confining Pressure

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

Effect of pore and confining pressures on V_P in thermally pre‐cracked granites

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Permeability of thermally cracked granite

Cited by 85 publications

References 8 publications

Fractured Rock Permeability as a Function of Temperature and Confining Pressure

Fractured Rock Permeability as a Function of Temperature and Confining Pressure

Changes of Selected Structural and Mechanical Properties of the Strzelin Granites As Induced By Thermal Loads / Wpływ Obciążeń Termicznych Na Zmiany Niektórych Strukturalnych I Mechanicznych Właściwości Granitów Strzelińskich

Effect of pore and confining pressures on VP in thermally pre‐cracked granites

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Effect of pore and confining pressures on V_P in thermally pre‐cracked granites