... is implemented into the numerical framework of a hybrid finite-discrete element method. The combined formulation can compute the stress/strain evolution in intact rocks, capture the mechanical interaction between matrix blocks, characterise the non-linear deformation of rough fractures and mimic the propagation...

... Lafayette, Indiana H. Yoon Sandia National Laboratories A. Bobet Purdue University, West Lafayette, Indiana ABSTRACT: In this paper, the role of micro-scale properties and behavior on the detection of crack initiation, propagation and geochemical alteration is examined through three topics: (1...

... under severe conditions. However, there is a lack of understanding on the interface behaviour between a rock bolt and bond material, especially on the crack initiation and propagation. The purpose of this paper is to investigate the effect of bolt configurations on the bolt-grout interface behavior...

... upstream oil & gas mechanism loading sequence specimen diagram brittleness plastic deformation onyx international journal reservoir geomechanics rock mechanic uniaxial compression loading propagation figure 4 ghazvinian reservoir characterization fracture variation...

... interface flaw propagate figure 5 geometry equation of state mpa figure 7 experiment discontinuity specimen originate figure 6 rock mechanic reservoir characterization coalescence figure 4 loading bobet propagation Rock Mechanics for Natural Resources and Infrastructure...

... INTRODUCTION Hydraulic fracture is a widely used method for increment of production in oil fields, which also could be used for in-situ stress measurements. Fracture initiates and/or propagates under confining stress, such as in-situ stress, in both above mentioned cases. Fracture toughness KIc, which...

... of brittle fracture, and the expressions of crack parameters and energy of electromagnetic radiation are derived. It is assumed that the electromagnetic radiation is generated by the Hertz oscillator array as crack propagation. The expressions of the electric and magnetic field intensity increment due...

... mpa intensity journal attenuation coefficient attenuation characteristic pore sandstone equation propagation excavation relationship rock mechanic newborn pore engineering figure 4 temporal-spatial attenuation disturbance amplitude Rock Mechanics for Natural Resources...

... al. (2005) suggested that there are two bending points in this region, which show that changes in the plate boundary geometry may affect rupture propagation of interplate earthquakes in the converging direction of the plate. For this reason, we tried to better describe the two bending points...

... to model directional hydraulic fracturing. The unbalanced force considering the effective stress of fluid is derived and a more effective vector type criterion of hydraulic fracture initiation and propagation is proposed. The unbalanced force magnitude indicates the fracture degree and direction clearly...

...Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Characterization of fracture toughness and propagation on intrusive basic rocks from Tamanduá mine, Minas Gerais state, Brazil S.A.R. Cerrato, A.C.C. Perim...

..., due to the skin effect, lies within the first tens of meters and in very high-resistivity media it is slightly more than a hundred meters, which is enough to accomplish the assigned tasks. 3. The propagation of waves in the frequency range from a few up to several hundred of kHz in a geological...

... propagation and its calculation expressions are established. Error propagation for several distances in the function of the precision of the evaluated total station is calculated. Error propagation in the convergence and settlement is defined separately. Finally, procedures for minimization of the error...

... to study the fracturing process and propagation (Moes et al. 1999, Li & Wong 2012, Kim & Moridis 2015). Many analysis methods were utilized in resolving problems in the study of hydraulic fracturing, such as the finite element method, discrete element method, and the element-free method. A number of 2D...

... developed by Hopkinson in 1914 to measure stress pulse propagation in a metal bar. Kolsky (1949) refined Hopkinson's technique by using two Hopkinson bars in series, now known as the Split-Hopkinson Pressure Bar (SHPB), to measure stress and strain. However, the measured responses are inferred from...

... the effect of free-surface and fractured zone on wave propagation near the excavation and further the PPV near/on excavation surface. reservoir characterization orientation obliquely incident s-wave upstream oil & gas amplification fracture orientation discontinuity reflection fracture...

... complex reservoir bedding plane mpa wh-3 hydraulic fracturing experiment triaxial hydraulic wh-2 upstream oil & gas shale gas operation mode iii bedding fracture fracture hydraulic fracture engineering propagation splitting china journal Rock Mechanics for Natural...

... marble specimen under true triaxial compression at 2 = 3 = 0.5 MPa. It can see from Figure 2a-c that the crack propagation has no fixed direction in 2 3 space, the fracture shapes may be curved, and cracks and fractures are random. The main fractures are subparallel or parallel 1 and thus...

... is acting within the fracture which favors propagation, especially during refilling. Now, it has to be investigated if those fractures are finite at a certain distance. This paper deals with the investigation of thermally-induced and gas-pressure driven fracturing in rock salt. Therefore, a new laboratory...

...Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Cement grout propagation in 2D fracture networks: Impact of rheology L. Zou Division of Resources, Energy and Infrastructure, Department of Sustainable...