Damage-induced permeability changes in granite: a case example at the URL in Canada

Souley, Mountaka; Homand, Françoise; Pepa, S.; Hoxha, Dashnor

doi:10.1016/s1365-1609(01)00002-8

Cited by 224 publications

(119 citation statements)

References 30 publications

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“…In these tests, the axial load on the core sample is increased, and the axial permeability is measured as a function of differential stress (axial stress less confining stress). Test results on granite by Takahashi et al (1995), Lee and Chang (1995), and Souley et al (2001) show that the permeability first decreases about one order of magnitude, until the axial stress has reached about half of the maximum stress (stress at rock failure). This reduction in permeability results from closure of existing pores and microfractures.…”

Section: Fundamental Hm Behavior Of Intact Rockmentioning

confidence: 98%

“…At higher stress, that is, values over half of the rock strength, the permeability increases, with increasing axial stress causing the onset of unstable crack growth. The permeability increase near the peak stress can be dramatic and is related to macroscopic failure by the coalescence of microcracks (Souley et al 2001).…”

Section: Fundamental Hm Behavior Of Intact Rockmentioning

confidence: 99%

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The role of hydromechanical coupling in fractured rock engineering

Rutqvist

Stephansson

2003

Hydrogeology Journal

575

332

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This paper provides a review of hydromechanical (HM) couplings in fractured rock, with special emphasis on HM interactions as a result of or directly connected with human activities. In the early 1960s, the coupling between hydraulic and mechanical processes in fractured rock started to receive wide attention. A series of events-including dam failures, landslides, and injection-induced earthquakes-were believed to result from HM interaction. Moreover, the advent of the computer technology in the 1970s made possible the integration of nonlinear processes such as stress-permeability coupling and rock mass failure into coupled HM analysis. Coupled HM analysis is currently being applied to many geological engineering practices. One key parameter in such analysis is a good estimate of the relationship between stress and permeability. Based on available laboratory and field data it was found that the permeability of fractured rock masses tends to be most sensitive to stress changes at shallow depth (low stress) and in areas of low in situ permeability. In highly permeable fractured rock sections, fluid flow may take place in clusters of connected fractures that are locked open as a result of previous shear dislocation or partial cementation of hard mineral filling. Such locked open fractures tend to be relatively insensitive to stress and may therefore be conductive at great depths.Because of out the great variability of HM properties in fractured rock, and the difficulties in using laboratory data for deriving in situ material properties, the HM properties of fractured rock masses are best characterized in situ.

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Section: Fundamental Hm Behavior Of Intact Rockmentioning

confidence: 98%

Section: Fundamental Hm Behavior Of Intact Rockmentioning

confidence: 99%

The role of hydromechanical coupling in fractured rock engineering

Rutqvist

Stephansson

2003

Hydrogeology Journal

575

332

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“…The hydromechanical behavior of fractured rock has been extensively studied through laboratory experiments on single fractures [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], field testing [5,[19][20][21][22][23][24][25][26][27][28][29][30][31], and numerical simulations [32][33][34][35][36][37][38][39][40][41][42]. Most of the field studies have been conducted at great depth in fractured hard rock, in which the permeability of the rock matrix is generally low and fractures act as dominating fluid conducting pathways.…”

Section: Introductionmentioning

confidence: 99%

“…Those studies indicate that hydraulic field tests can provide a good estimate for the hydromechanical properties of fractures. In tight, hard rock, single-borehole hydraulic pulse injections have been applied to determine hydraulic properties of rock fractures, including permeability and storativity [34,36,38]. Using specialized equipment for short duration pulses, this method has been proven to be useful for measuring hydraulic properties in fractures located at several hundred meters depth, with hydraulic aperture values as small as a few microns [34,36].…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical modelling of pulse tests that measure fluid pressure and fracture normal displacement at the Coaraze Laboratory site, France

Cappa

Guglielmi

Rutqvist

et al. 2006

International Journal of Rock Mechanics and Mining Sciences

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In situ fracture mechanical deformation and fluid flow interactions are investigated through a series of hydraulic pulse injection tests, using specialized borehole equipment that can simultaneously measure fluid pressure and fracture displacements. The tests were conducted in two horizontal boreholes spaced one meter apart vertically and intersecting a near-vertical highly permeable fault located within a shallow fractured carbonate rock. The field data were evaluated by conducting a series of coupled hydromechanical numerical analyses, using both distinct-element and finite-element modeling techniques and both two-and three-dimensional model representations that can incorporate various complexities in fracture network geometry.One unique feature of these pulse injection experiments is that the entire test cycle, both the initial pressure increase and subsequent pressure fall-off, is carefully monitored and used for the evaluation of the in situ hydromechanical behavior. Field test data are evaluated by plotting fracture normal displacement as a function of fluid pressure, measured at the same borehole. The resulting normal displacement-versus-pressure curves show a characteristic loop, in which the paths for loading (pressure increase) and unloading (pressure decrease) are different. By matching this characteristic loop behavior, the fracture normal stiffness and an equivalent stiffness (Young's modulus) of the surrounding rock mass can be back-calculated.Evaluation of the field tests by coupled numerical hydromechanical modeling shows that initial fracture hydraulic aperture and normal stiffness vary by a factor of 2 to 3 for the two 2 monitoring points within the same fracture plane. Moreover, the analyses show that hydraulic aperture and the normal stiffness of the pulse-tested fracture, the stiffness of surrounding rock matrix, and the properties and geometry of the surrounding fracture network significantly affect coupled hydromechanical responses during the pulse injection test. More specifically, the pressure-increase path of the normal displacement-versus-pressure curve is highly dependent on the hydromechanical parameters of the tested fracture and the stiffness of the matrix near the injection point, whereas the pressure-decrease path is highly influenced by mechanical processes within a larger portion of the surrounding fractured rock.

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“…These factors can significantly change the permeability of rock sample. For instance, Souley et al [18], Schulze et al [19], Jiang et al [20], and Chen et al [4] investigated the permeability change due to mechanical loading, and they found that the microcrack growth can result in an increase of permeability for 3∼5 orders of magnitudes. Many studies focused on the thermal effects on rock permeability subjected to high temperatures (>100 ∘ C) [13,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Permeability of Marble under Moderate Pressure and Temperature

et al. 2017

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The permeability of intact marble samples collected from the depth of 1.6 km in southwestern China is investigated under moderate confining pressures and temperatures. No microcracks initiate or propagate during the tests, and the variation of permeability is due to the change of aperture of microcracks. Test results show a considerable decrease of permeability along with confining pressure increase from 10 to 30 MPa and temperature increase from 15 to 40 ∘ C. The thermal effect on the permeability is notable in comparison with the influence of the stress. A simple permeability evolution law is developed to correlate the permeability and the porosity in the compressive regime based on the microphysical geometric linkage model. Using this law, the permeability in the compressive regime for crystalline rock can be predicted from the volumetric strain curve of mechanical tests.

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Damage-induced permeability changes in granite: a case example at the URL in Canada

Cited by 224 publications

References 30 publications

The role of hydromechanical coupling in fractured rock engineering

The role of hydromechanical coupling in fractured rock engineering

Hydromechanical modelling of pulse tests that measure fluid pressure and fracture normal displacement at the Coaraze Laboratory site, France

Investigating the Permeability of Marble under Moderate Pressure and Temperature

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