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Keywords: water pressure
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1850
..., water pressure is applied to a closed section in a borehole and the direction of the maximum principal stress is determined from the extensional direction of the tensile fracture in the borehole wall, and the maximum and minimum principal stresses are determined from the water pressure at the time...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1206
... ABSTRACT: Based on the elasto-plastic theory and Mohr-coulomb yielding criteria, the combined bearing effect of concrete lining and surrounding rock of large tunnel under the rock pressure, backfill grouting pressure, internal and external water pressure is analyzed by the three-dimensional...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0262
... ABSTRACT: The law of hydraulic pressure in the cracks is the basis for studying the hydraulic fracturing of rock mass and concrete. According to the characteristics of hydraulic fracturing of high dams and deep tunnels, the flow model of the fractures under constant water pressure...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0655
... tensile crack Reservoir Characterization Wellbore Design numerical analysis water pressure hydraulic fracturing mechanics geomechanics symposium specimen wellbore integrity inner flaw tip june 2016 Gonçalves da Silva geomechanics symposium geothermal reservoir experiment American Rock...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0630
... deformation analysis fluid particle dda analysis wall particle disk block DDA block DDA analysis model particle mp analysis Particle Simulation water particle Upstream Oil & Gas polygon block disc block water pressure water flow 1. INTRODUCTION Topographically the mountainous area...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0563
... of contact stresses along the contact interfaces were significantly affected by the lateral water pressure. 1. INTRODUCTION flow in porous media tbm tunnel segmental water pressure Reservoir Characterization waterflooding gasket test result gasket-to-groove contact interface segmental joint...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0415
... water pressures, and temperatures. Water circulated through the reservoir was measured for flow rate, pressure and temperature. Also, an overburden pressure was applied to the slabs to simulate actual overburden soil and rock. The workability of the laboratory-scale experimental setup for the geothermal...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-587
... hydraulic fracturing pore water pressure fracture system tensile strength permeability Mech fracture finite element Bazant Detournay hydraulic fracture propagation equation 1. INTRODUCTION The recent advances in hydraulic fracturing of oil and gas bearing shale, which have made the US self...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-502
... approximately five seconds corresponding to crack initiation and propagation. The AE setup was used in a series of hydraulic fracturing experiments on granite specimens. It was found that for one particular specimen, few emissions were observed until the applied water pressure reached 90% of the failure...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-666
... traditional methods have been unproductive. It involves use of modern water pressure test and grouting equipment, often available in-country or already under contract on a construction project. Lower costs and rapidity of testing permit more data to be collected than would otherwise be achieved, resulting...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-141
... water pressures up to 10 MPa can be generated, (2) a high speed camera that captures the last seconds of a test at 14,000 frames per second, (3) a high resolution camera that captures frames every 2 to 5 seconds throughout a test, and (4) an acoustic emission system that monitors the micro-seismic...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-164
... weak rock mass model test foundation reinforcement deformation abutment structural plane stability rock mass reservoir geomechanics specimen geo-mechanical model test weak structural plane water pressure upstream oil & gas displacement 1. INTRODUCTION Jinping I Hydropower Station...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7561
... Abstract We developed recently a new apparatus which allows laboratory fracturing experiments under tri-axial compression up to 15 MPa with pore water pressure up to 15 MPa. Silica sands with particle size of about 125&#956m are used as the simulated formation materials. In addition...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-118
... of displacement and water pressure in the partially undercut slope, but also to perform as a criterion for failure warning system during mining operation. The monitoring data obviously shows that the displacement of the undercut slope related to the undercut operation and the precipitation amount. This field...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-676
... in a directed network. Node and branch laws of water flow in discrete fracture networks are derived based on the conservation of mass and energy. The topology theory is applied in order to search the subways of water flow, and to calculate water pressures and flow rate in each branch of a weighted, directed...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-236
... stability, limit equilibrium analyses using Bishop Method and a finite element analysis including ground water pressures and additional support interactions are both used. 2. GEOLOGICAL, GEOTECHNICAL AND HYDROGEOLOGICAL INVESTIGATION The stratigraphic sequence starts with a Permo-Triassic subduction...
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-10-116
... great difficulties in the construction of the tunnel. Reservoir Characterization discontinuity surface fracture characterization convergence water pressure rock mass characteristic new qidaoliang tunnel Upstream Oil & Gas tunnel excavation sandstone Fracture Zone dip angle...
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-10-193
... debris open pit Elfen workflow rock mass Reservoir Characterization intrusive centre water pressure horizontal displacement contour upper bench udec result fault system strength pebble breccia dyke dyke expansion joint fabric 1. INTRODUCTION The geomechanical design of open pits...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-199
... has been examined. More disturbances in the contours of hydraulic head and pore water pressure have been observed near the tunnel periphery. The change in permeability upon redistribution of stresses is a function of the opening/closure of the joints. It has also been shown that the orientation...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-1126
... fracture application discrete fracture network FracMan Elfen intensity hydraulic fracturing strength characterisation water pressure pillar Rock Mech 1. INTRODUCTION The use of numerical models that incorporate the effects of fracturing is well established. Models range from equivalent...

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