The implications of joint deformation in analyzing the properties and behavior of fractured rock masses, underground excavations, and faults

Hopkins, Deborah

doi:10.1016/s1365-1609(99)00100-8

Cited by 79 publications

(25 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…fracture surface geometry, asperity deformability, fracture interlocking, testing conditions, etc.) which are discussed in detail in [3][4][5][6][7][8]29]. Given that under in-situ conditions most of these factors are difficult or impossible to determine, this study is intended to provide some ranges of stiffness characteristic values for practitioners involved in geotechnical projects in fractured rock masses where site-specific normal stiffness tests are not available.…”

Section: Resultsmentioning

confidence: 99%

Normal stiffness of fractures in granitic rock: A compilation of laboratory and in-situ experiments

Zangerl

Evans

Eberhardt

et al. 2008

International Journal of Rock Mechanics and Mining Sciences

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Normal stiffness of fractures in granitic rock: A compilation of laboratory and in-situ experiments

Zangerl

Evans

Eberhardt

et al. 2008

International Journal of Rock Mechanics and Mining Sciences

View full text Add to dashboard Cite

“…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%

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

View full text Add to dashboard Cite

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.

show abstract

“…In particular, Hopkins (2000) highlighted the determining role of the contact zone characteristics (shape, size, number, distribution and resistance) on the fracture's mechanical properties and of the structure of the free space between the walls (void space) on the hydraulic properties.…”

Section: Acquisition Of the Fracture's Morphological Featuresmentioning

confidence: 99%

Evolution of fracture permeability with respect to fluid/rock interactions under thermohydromechanical conditions: development of experimental reactive percolation tests

Blaisonneau¹,

Peter-Borie²,

Gentier³

2016

Geotherm Energy

View full text Add to dashboard Cite

The implications of joint deformation in analyzing the properties and behavior of fractured rock masses, underground excavations, and faults

Cited by 79 publications

References 63 publications

Normal stiffness of fractures in granitic rock: A compilation of laboratory and in-situ experiments

Normal stiffness of fractures in granitic rock: A compilation of laboratory and in-situ experiments

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

Evolution of fracture permeability with respect to fluid/rock interactions under thermohydromechanical conditions: development of experimental reactive percolation tests

Contact Info

Product

Resources

About