Investigations of the relations among residual strain, fabric, fracture and ultrasonic attenuation and velocity in rocks

Friedman, M.; Bur, Thomas R.

doi:10.1016/0148-9062(74)90129-6

Cited by 26 publications

(3 citation statements)

References 5 publications

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“…Grain size range is about 1-0.1 mm. No conspicuous macro fractures occur at the surfaces of the blocks, as remarked by Friedman and Bur (1974). In addition the modulus G and the Poisson ratio ν are greatly influenced by the granite cracks density.…”

Section: Weber Sandstonementioning

confidence: 83%

“…These vary from points to sutured, most are tangential. The detrital quartz grains contain some deformation lamellae and healed microfractures, but very few fresh unhealed micro fractures are observed in thin section as described in a classical study of Friedman and Bur (1974). Berea Sandstone was formed in the Late Devonian period, the majority of its sand came from the north, flowing in a river from the highlands of eastern Canada.…”

Section: Abyssal Red Claymentioning

confidence: 90%

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On the propagation of nonlinear transients of temperature and pore pressure in a thin porous boundary layer between two rocks

Salusti

Kanivetsky²,

Droghei

et al. 2019

Journal of Hydrology

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The dynamics of transients of fluid-rock temperature, pore pressure, pollutants in porous rocks are of vivid interest for fundamental problems in hydrological, volcanic, hydrocarbon systems, deep oil drilling. This can concern rapid landslides or the fault weakening during coseismic slips and also a new field of research about stability of classical buildings. Here we analyze the transient evolution of temperature and pressure in a thin boundary layer between two adjacent homogeneous media for various types of rocks. In previous models, this boundary was often assumed to be a sharp mathematical plane. Here we consider a non-sharp, physical boundary between two adjacent rocks, where also local steady pore pressure and/or temperature fields are present. To obtain a more reliable model we also investigate the role of nonlinear effects as convection and fluid-rock "frictions", often disregarded in early models: these nonlinear effects in some cases can give remarkable quick and sharp transients. All of this implies a novel model, whose solutions describe large, sharp and quick fronts. We also rapidly describe transients moving through a particularly irregular boundary layer.

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Section: Weber Sandstonementioning

confidence: 83%

Section: Abyssal Red Claymentioning

confidence: 90%

On the propagation of nonlinear transients of temperature and pore pressure in a thin porous boundary layer between two rocks

Salusti

Kanivetsky²,

Droghei

et al. 2019

Journal of Hydrology

View full text Add to dashboard Cite

show abstract

“…In the geology and rock mechanics we are normally concerned with subsurface conditions under which the 'external forces and moments' (Nadai 1950) have not been removed, yet numerous authors have referred to both residual and locked-in stresses. Friedman & Bur (1974) stated:…”

Section: Alternative Perceptions Of Stress Statementioning

confidence: 99%

The nature of stress state: numerical and laboratory experiments and some field observations

Harper¹,

Hagan²

2015

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Simulations of the stress state in a region of discontinuously fractured rock revealed a strongly heterogeneous, self-organized stress distribution displaying internally balanced strains and corresponding energy storage. The explicit simulations follow a sequence which may be inferred to be irreversible and strongly dependent on interaction between fractures, implying a time-dependency. The state of the simulated reservoir displays a sensitivity characteristic of marginal stability. These numerical observations are compared with new and previous laboratory and field experiments spanning a wide range of size, stress magnitude and stress difference. The characteristics of the state of the simulated reservoir, laboratory samples and field behaviour are found to be consistent with the numerical predictions. A stress memory is evident. This supports previous conclusions that the concept of stress state as uniform, constant and resulting from averaged values of stresses or displacements, presently applied at remote and artificial boundaries, is grossly oversimplified and flawed.

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The Influence of Subsurface Conditions on Hydraulically Induced Fractures in Deep Rocks

Abou-Sayed

1983

Hydraulic Fracturing and Geothermal Energy

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Investigations of the relations among residual strain, fabric, fracture and ultrasonic attenuation and velocity in rocks

Cited by 26 publications

References 5 publications

On the propagation of nonlinear transients of temperature and pore pressure in a thin porous boundary layer between two rocks

On the propagation of nonlinear transients of temperature and pore pressure in a thin porous boundary layer between two rocks

The nature of stress state: numerical and laboratory experiments and some field observations

The Influence of Subsurface Conditions on Hydraulically Induced Fractures in Deep Rocks

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