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Keywords: energy release rate
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1864
... coal mining scenario. The vertical stress, total volume of gas emission, and incremental energy release rate ( ERR ) were determined from a coupled geomechanical and gas flow model to represent longwall top coal caving mining practiced at Coal Mine Velenje. The values were fed into the PRA framework...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1628
..., 2013; He and Xu, 2015). For these limitations, we opt to use scratch testing to obtain materials' fracture properties in our study. hydraulic fracturing scratch test energy density contact bearing area fracture characterization reservoir characterization energy release rate degradation...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1619
.... In both cases, we compare the fracture aspect ratio obtained by our numerical results with simplified estimations based on the minimization of the variation of local stress intensity factor (or energy release rate) under the assumption of an elliptical fracture. Our numerical results show that for both...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-656
... elastic fracture mechanics, virtual crack closure technique (VCCT) is an effective method for determining the energy release rate and is based on the assumption that a slight crack extension does not significantly alter the state of the crack tip. However, this assumption of self-similarity could become...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0381
... and to provide a data based evaluation of the applicability to hydraulic fracturing design. 1. INTRODUCTION Artificial Intelligence hydraulic fracturing orientation Wellbore Design strength LABORATORY study evaluation variation brittleness index energy release rate weightage compressive...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-347
... attributed to cataclasis and porosity reduction. We have employed different approaches to calculate the propagation energy release rate of the bands and found out that the thickness variation along bands can be attributed to variable stress and propagation energy release along the bands. Based on our...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-436
... fracture tip energy release rate crack growth fracture crack tip interaction 1. INTRODUCTION Multistage hydraulic fracturing in long horizontal wells has become a common practice for economic production in extremely low permeability hydrocarbon reservoirs. For each stage of fracturing, several...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-119
... joint sets have dip direction of about 10°~ 40°and dip of about 55°~ 75°(about 5.7% of total joints in statistics), or dip direction of 20°~ 55°an dip of 15°~ 30°(about 1% of total joints in statistics). Reservoir Characterization Wellbore Design energy release rate cavern layout design main...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-278
... high net pressure (4000 psi) would imply a relatively wide fracture if only a single-stranded hydraulic fracture is assumed. Artificial Intelligence fracture mechanics complex reservoir stress singularity energy release rate horizontal stress hydraulic fracturing orientation mechanism...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-134
... have been implemented into the code: the maximum stress criterion and the critical energy release rate criterion. The two criteria have been expanded, from their initial formulation for tensile cracks, to incorporate initiation of shear cracks. The two initiation criteria give similar results...
Proceedings Papers

Paper presented at the Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS), June 25–29, 2005
Paper Number: ARMA-05-685
... energy release rate, GIIC, increases with normal stress and its magnitude depends on the frictional characteristics of the surface and on the displacement required to decrease the frictional strength from peak to residual. INTRODUCTION The behavior of a rock mass is determined not only...
Proceedings Papers

Paper presented at the The 35th U.S. Symposium on Rock Mechanics (USRMS), June 5–7, 1995
Paper Number: ARMA-95-0447
... from the seismic estimate and 0.0335 mm from the global measurement. The seismic energy per unit area from acoustic emission was compared with the strain energy release rate computed from the same portion of the post-peak, stress-displacement curve. The seismic estimate of energy release rate was 5.73...
Proceedings Papers

Paper presented at the The 28th U.S. Symposium on Rock Mechanics (USRMS), June 29–July 1, 1987
Paper Number: ARMA-87-0375
... reported (Advani et al. 1986). A fracture criterion, G > G critical , based on the computed energy release rate, G, is adopted for interface fracture penetration. A semi-radial singularity mapping technique is used to account for the appropriate hi-material induced singularity, ¿, when the crack tips...
Proceedings Papers

Paper presented at the The 22nd U.S. Symposium on Rock Mechanics (USRMS), June 29–July 2, 1981
Paper Number: ARMA-81-0213
... Reservoir Characterization fracture characterization energy release rate plane excavation rock fracture INVESTIGATIONS OF ROCK FRACTURE AROUND DEEP-LEVEL GOLD MINE STOPES G.R. Adams and A.J. Jager Mining Technology Laboratory Chamber of Mines of South Africa and C. Roering Rand Afrikaans University...
Proceedings Papers

Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0088
... tests with ß = 45° in both materials. Upstream Oil & Gas notch tip crack tip reservoir geomechanics Rock Structure initiation fracture propagation Reservoir Characterization primary crack propagation energy release rate tensile stress hydraulic fracturing secondary crack...
Proceedings Papers

Paper presented at the The 16th U.S Symposium on Rock Mechanics (USRMS), September 22–24, 1975
Paper Number: ARMA-75-247
... resistance network analog, which may be used to compute the stress, displacement and energy changes due to mining. The energy release rate design procedure is described, and an application of the method to the design of extraction sequences at the Star Mine in the Coeur d'Alêne district is presented...
Proceedings Papers

Paper presented at the The 8th U.S. Symposium on Rock Mechanics (USRMS), September 15–17, 1966
Paper Number: ARMA-66-0194
... of hanging and rockbursts occur frequently. A number of regions were selected in each mine for analysis. These were chosen to represent a wide variety of mining geometries and energy release rates. Within each mine the regions were in close proximity, so that local geological variations would...

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