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Go **Concept Tag**

- analysis (83)
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to

GoThe robustness of the developed method is verified through the rock tunnel stability analysis, which demonstrates the potential ability to analyze the interactive contact among complex blocks in the 3-D numerical manifold platform.

SPE Disciplines:

analysis, Artificial Intelligence, assessment, Baixo Sabor, block, dam, dam foundation, deformable block, discontinuity, discontinuum, displacement, factor, failure, foundation, hydraulic fracturing, management and information, mass, model, reduction, representation, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, rock discontinuity, safety, Upstream Oil & Gas, well completion

SPE Disciplines:

angle, behaviour, capacity, Chong, different joint dip angle, drilling fluids and materials, effect, head load-deflection, joint dip, joint dip angle, jointed rock, laboratory, Laterally, management and information, model, pile, pile head load-deflection, pile socketed, Reservoir Characterization, reservoir description and dynamics, rock, study, University

SPE Disciplines:

analysis, criteria, criterion, difference, DP criterion, effect, failure, hollow cylinder, increase, MC criterion, pore, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, safe mud weight window, shear, stability, strength, stress, Upstream Oil & Gas, Wellbore Design, wellbore integrity

SPE Disciplines:

The paper presents the post peak response of granite under strain controlled loading for confining pressures of 0 to 30MPa in the laboratory. The strength and deformation parameters are determined from laboratory test results. The peak and residual strength parameters are determined using Mohr Coulomb criterion. The variation of cohesion and friction angle with plastic strain is also determined. The rock shows the vertical splitting under confining pressures of 0 and 10MPa and shear failure under other high confining pressures. The rate of softening is less under low confining pressures and high under high confining pressures.

The paper also presents the application of softening behavior of granite to the analysis of large underground caverns (Power house and transformer yard) under plane strain conditions using FLAC. The power house cavern is 22m wide and 44m high and transformer hall cavern is 16m wide and 22m high. The analyses of large underground caverns have been carried out using conventional Mohr-Coulomb model and Mohr-Coulomb model with strain softening effect using FLAC. The support system has been installed in various stages in the form of shotcrete and effect of softening on cavern behavior is studied. The effect of support system on the softening behavior is also studied in detail.

It is seen from the analyses that there is significant effect of the softening on caverns behavior.

SPE Disciplines:

This paper presents the results of numerical simulations using PFC2D corresponding to two lab experiments. The modeling carried out to investigate the effect of different parameters on the interaction mechanism. Sample I includes a sandstone block in the middle of a 15 cm mortar cube. In sample II sandstone block is located in the two sides of the mortar block. The macro properties of the samples (UCS, friction coefficient etc) used for this study were estimated from the model micro properties (bond strength, friction) which are the input to PFC models. This was done by performing several simulations including bi-axial, direct and Brazilian tensile tests from which the rock properties were determined through the plot of Mohr Circles corresponding to different stress levels. Similarly, micro and macro hydraulical properties were estimated using permeability simulation tests. A hydraulic fracture was initiated in the centre of the sample and model response was monitored. The results are presented here and conclusions are made.

block, experiment, fracture, hydraulic fracture, hydraulic fracturing, interaction, interface, mechanism, Mortar, numerical simulation, particle, propagation, property, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, sample, Sample II, sandstone, sarmadivaleh, strength, stress, Upstream Oil & Gas, well completion, wellbore

SPE Disciplines:

Kusuma, G.J. (Kyushu University) | Hiroto, K. (Kyushu University) | Shimada, H. (Kyushu University) | Sasaoka, T. (Kyushu University) | Matsui, Kikuo (Kyushu University) | Gautama, R.S. (Institute Technology Bandung) | Sulistianto, B. (Institute Technology Bandung)

acid, column, concentration, condition, cycle, different water, drilling fluid management & disposal, drilling fluids and materials, experiment, leachate, leachate characteristic, mineral, Reservoir Characterization, reservoir description and dynamics, rock, rock sample, sample, sulfate, sulphidic coal mine waste, Upstream Oil & Gas, various water, water, water balance

SPE Disciplines:

Tsusaka, K. (Japan Atomic Energy Agency) | Inagaki, D. (Japan Atomic Energy Agency) | Koike, M. (Taisei Corporation) | Ijiri, Y. (Taisei Corporation) | Hatsuyama, Y. (Taisei Corporation)

analysis, Circumferential stress, concrete lining, difference, direction, displacement, excavation, excavation face, horonobe underground, management and information, mechanical behavior, Reservoir Characterization, reservoir description and dynamics, rock, shaft, shaft wall, strain, stress, underground research laboratory

SPE Disciplines:

Chung, So-Keul (Korea Institute of Geoscience and Mineral Resources) | Park, Eui-Seob (Korea Institute of Geoscience and Mineral Resources) | Synn, Joong-Ho (Korea Institute of Geoscience and Mineral Resources) | Jeong, Woo-Cheol (SK Engineering and Construction) | Kim, Taek-Kon (SK Engineering and Construction)

analysis, cavern, formation, freezing, gas monetization, groundwater, heat transfer, hydraulic gradient, ice-ring formation, isotherm, joint aperture, liquified natural gas, LNG, mass, Midstream Oil & Gas, numerical simulation, reservoir description and dynamics, rock, rock joint, rock mass, underground lng storage, Upstream Oil & Gas

SPE Disciplines:

Thank you!