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Go **Concept Tag**

- analysis (29)
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to

GoThis paper presents the results of preliminary experiments that were carried out with the Rock Strength Device (RSD), to investigate the feasibility of determining rock strength parameters from cutting tests. The approach used to determine the strength parameters of the rocks with the RSD is novel. It is based on an interpretation of the forces required to [scratch] a rock. This approach has many advantages over the conventional method for measuring strength parameters: low cost and portability of the RSD, operational simplicity and rapidity of measurement, ability to make many measurements, ability to provide a log of strength from cores, and relatively non-destructive testing of the rock core.

ARMA-96-1515

2nd North American Rock Mechanics Symposium

angle, bit selection, cutter, Detournay, diagram, experiment, face, friction, friction line, intrinsic specific energy, model, MPa, red wildmoor sandstone, Reservoir Characterization, reservoir description and dynamics, reservoir geomechanics, rock, rock strength, sharp cutter, strength, test, Upstream Oil & Gas

SPE Disciplines:

ARMA-96-1113

2nd North American Rock Mechanics Symposium

axial, Completion Installation and Operations, deformation, difference, elastoplastic model, experiment, hole, Hoop strain, MPa, prediction, Reservoir Characterization, reservoir description and dynamics, rock, strain, stress, test, thick-walled cylinder, triaxial, triaxial test, TWC test, Upstream Oil & Gas, well completion, Wellbore Design, wellbore integrity

SPE Disciplines:

This paper presents the results of plate loading test and discontinuum analysis, carried out to study the deformation behaviour and determine the deformation modulus of metamorphosed andesitic tuff found at the site of a underground oil storage facility in Korea. In the plate loading test, the maximum pressure of 14 MPa was applied to the bedrock, using a flat jack (1m in diameter) and the rock anchor system for the reaction against the applied pressure. The values of deformation modulus obtained from this test were compared with those of laboratory test, biaxial test and pressuremeter test. Discontinuum analysis was performed to study the influence of discontinuities on in-situ modulus by simulating the presence of joints and the calcite seam at the test area.

3.1 Test condition at the site

ARMA-96-1573

2nd North American Rock Mechanics Symposium

The analysis of structures in discontinuous rock masses has been receiving a particular interest in rock mechanics and rock engineering. A technique based on the finite element method together with the contact element to model rock masses consisting of blocks of arbitrary shapes is developed and its formulation is presented. This model considers blocks as sub-domains and represents them by solid elements. To model the block interactions such as sliding or separation, contact elements, which are far-superior to joint or interface elements, are used. Then this model is used to simulate the behaviour of typical rock engineering structures such as a single block or a pile of blocks on a incline and underground cavities and rock slopes in jointed rock masses.

ARMA-96-2039

2nd North American Rock Mechanics Symposium

SPE Disciplines:

Technology: Information Technology > Artificial Intelligence > Representation & Reasoning > Mathematical & Statistical Methods (1.00)

The engineering geological and rock mechanics activities for radioactive waste repositories are strongly linked to the safety concepts for the repository projects. Key issues are: proper site characterisation, proof of geotechnical safety and quantitative description of geomechanical processes and of geological scenarios for long-term safety assessment calculations. A status report of the German repository projects Gorleben and Konrad based on this concept will be presented. While these projects are still being pursued the former Morsleben salt mine in Sachsen-Anhalt, which was used as a repository for short-lived low and intermediate level waste from 1981 until 1991 has resumed its operation in 1994. In the paper some issues are demonstrated by an example: site characterisation work for a salt dome, geotechnical measurements and calculations to proof the stability of a mine, and considerations of geomechanical natural analoga for calibration of constitutive laws. For the future the role and contributions of geoscientific and rock mechanics work within the safety assessment issues (e.g. geomechanical safety indicators) must be identified in greater detail.

ARMA-96-1437

2nd North American Rock Mechanics Symposium

activity, assessment, calculation, convergence, Disposal, field, Gorleben, health safety security environment and social responsibility, investigation, model, process, radioactive waste, repository, Reservoir Characterization, reservoir description and dynamics, rock, rock mechanical, rock salt, salt, stress, structural geology, subsidence, Upstream Oil & Gas

SPE Disciplines:

ARMA-96-1559

2nd North American Rock Mechanics Symposium

amplitude, analysis, block, deformation, destruction, dimension, displacement, drift, excavation, failure, granite, investigation, loading, Reservoir Characterization, reservoir description and dynamics, rock, roof, seismic processing and interpretation, stability, strength, underground nuclear explosion, Upstream Oil & Gas, Wave

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)

Fracture coalescence has been investigated on a variety of model rock specimens. The specimens contain two preexisting fractures which are either open or closed, and which are arranged at different distances and angles. Uniaxial and biaxial loading are applied. A biaxial machine was especially designed and built for this investigation. During the loading process crack initiation, propagation, and coalescence are observed. In the uniaxial tests, wing cracks and secondary cracks appear at the same time; wing cracks from open flaws initiate at 45 with respect to the loading direction, while secondary cracks initiate parallel to the flaw. In biaxial tests, wing cracks occur in the center of preexisting fractures or not at all. This research, as well as previous work at M.I.T confirm that secondary cracks which are often shear cracks play a very important role in crack propagation and coalescence.

ARMA-96-1603

2nd North American Rock Mechanics Symposium

ARMA-96-1951

2nd North American Rock Mechanics Symposium

bedding, blocky, dynamic loading, excavation, face, fracture, hangingwall, hangingwall stability, model, Reservoir Characterization, reservoir description and dynamics, resistance, rockmass, seismic processing and interpretation, stope, stress, support, support unit, system, Trend, unit, Upstream Oil & Gas

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (0.46)

3.1 Triaxial test data and local constitutive modelling

ARMA-96-1699

2nd North American Rock Mechanics Symposium

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.47)

Shimizu, N. (Department of Civil Engineering, Yamaguchi University) | Kakihara, H. (Department of Civil Engineering, Yamaguchi University) | Terato, H. (Department of Civil Engineering, Yamaguchi University) | Nakagawa, K. (Department of Civil Engineering, Yamaguchi University)

This paper proposes a back analysis method of measured displacements for predicting deformational behavior of discontinuous rock mass. The method is formulated by the adaptive filtering combined with the Backward Discontinuous Deformation Analysis (DDA). The Backward DDA is used to derive the observation equation, and the governing equation of displacements is adopted as the state equation in this method. The final deformational behavior of rock mass is predicted from measured displacements and the present deformational behavior is also estimated.

1. the rock mass is composed of a number of blocks surrounded by discontinuities, 2. continuous displacement and small strain occur within each block, and displacements is composed of rigid-body parallel translation and rotation, and strains of rock block, 3. rock mass deformation shows steady-state time dependent behavior. The first two assumptions are the same as those in the Backward DDA and the last considers time dependent displacement behavior of rock mass, which will be defined in Section 3.2.

ARMA-96-1999

2nd North American Rock Mechanics Symposium

SPE Disciplines: Reservoir Description and Dynamics > Reservoir Characterization > Reservoir geomechanics (0.48)

Thank you!