Static uniaxial deformation of 15 rocks to 30 kb

Brace, W. F.; Riley, Don K

doi:10.1016/0148-9062(72)90028-9

Cited by 47 publications

(18 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several experimental and numerical studies have been conducted upon the relationship between porosity and mechanical properties of rocks. Brace and Riley [1] selected 15 different rock samples with porosity ranging from nearly zero to 40%, and reported variation in static uniaxial deformation between the low-and high-porosity rocks. Dunn et al [2] carried out extensive laboratory tests and proposed an equation y¼a Â x b to quantify the strong dependence of fracture strength on porosity (where y equals the stress difference at failure and x represents porosity, parameter a varied with degree of loading and b is a dimensionless constant ranging between À 0.8 and À 1.0).…”

Section: Introductionmentioning

confidence: 99%

Porosity increment and strength degradation of low-porosity sedimentary rocks under different loading conditions

Shang

Zhou

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Porosity increment and strength degradation of low-porosity sedimentary rocks under different loading conditions

Shang

Zhou

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

View full text Add to dashboard Cite

“…These studies have shown that unconsolidated materials and fault gouge display the greatest volume changes, but that sandstone (BRACE and RILEY, 1972) and tuffs (HoNDA eta/., 1982) also undergo significant losses as well. Field evidence supporting this mechanism includes cyclic changes in inert gas ratios associated with tidal strain variations (SUGISAKI, 1978;SuGISAKI and SUGIURA, 1986) and explosion induced radon anomalies.…”

Section: Pore Collapse Modelmentioning

confidence: 99%

Geochemical precursors to seismic activity

Thomas

1988

PAGEOPH

227

112

View full text Add to dashboard Cite

Abstract-Studies of earthquake precursory phenomena during the last several decades have found that significant geophysical and geochemical changes can occur prior to intermediate and large earthquakes. Among the more intensely investigated geochemical phenomena have been: (1) changes in the concentrations of dissolved ions and gases in groundwaters and (2) variations in the concentrations of crustal and mantle volatiles in ground gases. The concentration changes have typically showed no consistent trend (either increasing or decreasing), and the spatial and temporal distribution of the observed anomalies have been highly variable. As a result, there is little agreement on the physical or chemical processes responsible for the observed anomalies. Mechanisms proposed to account for precursory groundwater anomalies include ultrasonic vibration, pressure sensitive solubility, pore volume collapse, fracture induced increases in reactive surfaces, and aquifer breaching/fluid mixing. Precursory changes in soil gas composition have been suggested to result from pore volume collapse, micro-fracture induced exposure of fresh reactive silicate surfaces, and breaching of buried gas-rich horizons. An analysis of the available field and laboratory data suggests that the aquifer breaching/fluid mixing (AB/FM) model can best account for many of the reported changes in temperature, dissolved ion and dissolved gas concentrations in groundwater. Ultrasonic vibration and pressure sensitive solubility models cannot reasonably account for the geochemical variations observed and, although the pore collapse model could explain some of the observed chemical changes in groundwater and ground gas, uncertainties remain regarding its ability to generate anomalies of the magnitude observed. Other geochemical anomalies, in particular those associated with hydrogen and radon, seem best accounted for by increases in reactive surface areas (IRSA model) that may accompany precursory deformation around the epicenter of an impending earthquake. Analysis of the probable response of these models to the earthquake preparation process, as well as to other environmental factors, suggests that geochemical monitoring programs can provide information that may be valuable in forecasting the probability of an earthquake; however, because of the complexity of the earthquake preparation process, the absolute prediction of seismic events using geochemical methods alone, does not presently appear to be feasible.

show abstract

“…Pressure coefficient stress/pressure, P, as a function of the volumetric strain ȝ during uniaxial strain loading for Westerly granite [6] and for Climax stock granodiorite [7]. Pressure constants K 1, K 2 , K 3 are obtained by fitting P to ȝ using ,…”

Section: Determination Of Model Constants For Granitementioning

confidence: 99%

Numerical Modeling of Shock-Induced Damage for Granite under Dynamic Loading

Ai¹,

Ahrens²

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract.Johnson-Holmquist constitutive model for brittle materials, coupled with a crack softening model, is used to describe the deviatoric and tensile crack propagation beneath impact crater in granite. Model constants are determined either directly from static uniaxial strain loading experiments, or indirectly from numerical adjustment. Constants are put into AUTODYN-2D from Century Dynamics to simulate the shock-induced damage in granite targets impacted by projectiles at different velocities. The agreement between experimental data and simulated results is encouraging. Instead of traditional grid-based methods, a Smooth Particle Hydrodynamics solver is used to define damaged regions in brittle media.

show abstract

Static uniaxial deformation of 15 rocks to 30 kb

Cited by 47 publications

References 17 publications

Porosity increment and strength degradation of low-porosity sedimentary rocks under different loading conditions

Porosity increment and strength degradation of low-porosity sedimentary rocks under different loading conditions

Geochemical precursors to seismic activity

Numerical Modeling of Shock-Induced Damage for Granite under Dynamic Loading

Contact Info

Product

Resources

About