A study of the intrinsic permeability of granite to gas

Skoczylas, Frédéric; Henry, J.P.

doi:10.1016/0148-9062(94)00022-u

Cited by 48 publications

(18 citation statements)

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“…We did not carry out homogeneous tests on concrete. However, we tested, in our true triaxial apparatus [10], a drilled cube (50 x 50 x 50 cm 3) made up of an ordinary concrete. We injected water into the borehole in order to measure the radial permeability while the cube was laterally loaded up to the breakdown.…”

Section: Resultsmentioning

confidence: 99%

“…When used in a test over a long period under a high pressure gradient, the latter may bring about dissolution and migration of fine elements within the material. This problem also occurs during tests on rock materials such as granite [10]. Furthermore the physico-chemical mechanisms which arise in the porous network during water circulation are not completely understood at the present time.…”

Section: General Remarks and Experimental Devicementioning

confidence: 95%

“…As mentioned before, the gas is assumed to be ideal and the test lasts sufficiently long for it to be under isothermic conditions. Consequently it can be shown that the mean volume flow is written [10]:…”

Section: Measuring Gas Permeabilitymentioning

confidence: 99%

“…Such precautions allow us to place the study within the conditions of Darcy's law which is used for a one-dimensional flow. The pulse-test measurement method [10] was not chosen even though it would save time while imposing a higher injection-pressure gradient. In fact it may disturb the mechanical response of the sample by poromechanical coupling.…”

Section: Measuring Gas Permeabilitymentioning

confidence: 99%

“…Since the early 1930's the rate of water flow through concrete has been of particular interest to civil engineers in dam seepage and water retaining structures problems [4,5] ; however, the interest has shifted in the 1960's when permeability and adsorption were implemented as non-destructive indicators of the quality of concrete [6,7]. Improved testing methods and new standards are currently available for in-situ and laboratory assessments of gas and water permeability of concrete and porous media [8][9][10][11][12]. From an experimental perspective, the degradation in concrete or rock modulus and the corresponding change in permeability, due to static and cyclic mechanical loading, has been demonstrated and documented in the literature [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of the mechanical behaviour of a mortar and of its permeability under deviatoric loading

Meziani

Skoczylas

1999

Mat. Struct.

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This study, which presents the results of numerous tests on the sensitivity of mortar permeability under conventional triaxial loading, represents tests carried out over more than a year at various confining pressures under monotonic loading or with loading-unloading cycles. Permeability is measured on a sample, dried prior to the test, by injecting argon -a neutral gas. A description of the experimental method based on applying a permanent flow is given as well as the technique of test study used. In this work, we chose to measure permeability under loading at different levels ofdeviatoric stress and strain since this corresponds more closely to the real conditions under which the works are used. Preliminary tests showed that the permeability under load was susceptible to early appearance of microcracks and began to increase noticeably towards 75/80% of the stress peak. Further tests were then carried out with loading-unloading cycles for stress levels beyond the stress peak. The authors have shown that permeability increases very rapidly, starting from this peak. This is irreversible as the measurements taken after unloading the sample prove. The different tests also prove that the damage level is insufficient to allow for a description of variation in permeability, as it clearly depends on the degree to which the microcracks have opened. Such a claim is supported by results where this variation is presented in relation to lateral strain. R I~S U M I 5

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Section: Resultsmentioning

confidence: 99%

Section: General Remarks and Experimental Devicementioning

confidence: 95%

Section: Measuring Gas Permeabilitymentioning

confidence: 99%

Section: Measuring Gas Permeabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An experimental study of the mechanical behaviour of a mortar and of its permeability under deviatoric loading

Meziani

Skoczylas

1999

Mat. Struct.

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A coupled hydromechanical system defined through rock mass classification schemes

Liu¹,

Elsworth²,

Brady³

1999

Int. J. Numer. Anal. Meth. Geomech.

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SUMMARYChanges in the hydraulic conductivity "eld, resulting from the redistribution of stresses in fractured rock masses, are di$cult to characterize due to complex nature of the coupled hydromechanical processes. A methodology is developed to predict the distributed hydraulic conductivity "eld based on the original undisturbed parameters of hydraulic conductivity, Rock Mass Rating (RMR), Rock Quality Designation (RQD), and additionally the induced strains. The most obvious advantage of the methodology is that these required parameters are minimal and are readily available in practice. The incorporation of RMR and RQD, both of which have been applied to design in rock engineering for decades, enables the stress-dependent hydraulic conductivity "eld to be represented for a whole spectrum of rock masses. Knowledge of the RQD, together with the original hydraulic conductivity, is applied to determine the e!ective porosity for the fractured media. When RQD approaches zero, the rock mass is highly fractured, and fracture permeability will be relatively high. When RQD approaches 100, the degree of fracturing is minimal, and secondary porosity and secondary permeability will be low. These values bound the possible ranges in hydraulic behaviour of the secondary porosity within the system. RMR may also be applied to determine the scale e!ect of elastic modulus. As RMR approaches 100, the &softening' e!ect of fractures is a minimum and results in the smallest strain-induced change in the hydraulic conductivity because the induced strain is uniformly distributed between fractures and matrix. When RMR approaches zero, the laboratory modulus must be reduced signi"cantly in order to represent the rock mass. This results in the largest possible change in the hydraulic conductivity because the induced strain is applied entirely to the fracture system. These values of RMR bound the possible ranges in mechanical behaviour of the system. The mechanical system is coupled with the hydraulic system by two empirical parameters, RQD and RMR. The methodology has been applied to a circular underground excavation and to qualitatively explain the in situ experimental results of the macropermeability test in the drift at Stripa.

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Test Techniques and Experimental Characterization

Burlion¹

2013

Mechanical Behavior of Concrete

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A study of the intrinsic permeability of granite to gas

Cited by 48 publications

References 1 publication

An experimental study of the mechanical behaviour of a mortar and of its permeability under deviatoric loading

An experimental study of the mechanical behaviour of a mortar and of its permeability under deviatoric loading

A coupled hydromechanical system defined through rock mass classification schemes

Test Techniques and Experimental Characterization

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