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in subjects: "Rock Mechanics"

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Compilation of cores and cuttings from U. S. Government-sponsored geothermal wells

This compendium lists the repositories holding geothermal core and well cuttings from US government-sponsored geothermal wells. Also, a partial listing of cores and cutting from these wells is tabulated, along with referenced reports and location maps. These samples are available to the public for research investigations and studies, usually following submission of an appropriate request for use of the samples. The purpose of this compilation is to serve as a possible source of cores and cuttin… more

Date: July 1, 1980

Creator: Mathews, M.; Gambill, D.T. & Rowley, J.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geotechnical studies relevant to the containment of underground nuclear explosions at the Nevada Test Site

The Department of Energy and the Department of Defense are actively pursuing a program of nuclear weapons testing by underground explosions at the Nevada Test Site (NTS). Over the past 11 years, scores of tests have been conducted and the safety record is very good. In the short run, emphasis is put on preventing the release of radioactive materials into the atmosphere. In the long run, the subsidence and collapse of the ground above the nuclear cavities also are matters of interest. Currently,… more

Date: May 1, 1982

Creator: Heuze, F.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Seismic velocities and attenuation in an underground granitic waste repository subjected to heating

The behavior of a granitic rock mass subjected to thermal load has been studied by an acoustic cross-hole technique between four boreholes, over a period of some two years. Velocities between boreholes were obtained from the times-of-flight of pulses of acoustic waves between transducers clamped to the borehole wall. The attenuation was obtained by a spectral ratios technique. When the heater was turned on, the velocities increased rapidly to an asymptotic value. When the heater was turned off,… more

Date: March 1, 1984

Creator: Paulsson, B.N.P. & King, M.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Quality-assurance study of the special - purpose finite-element program - SPECTROM: I. Thermal, thermoelastic, and viscoelastic problems. [Comparison with MARC-CDC]

This comparison study involves a preliminary verification of finite element calculations. The methodology of the comparison study consists of solving four example problems with both the SPECTROM finite element program and the MARC-CDC general purpose finite element program. The results show close agreement for all example problems.

Date: December 1, 1980

Creator: Wagner, R. A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Drilling technology/GDO

The Geothermal Technology Division of the US Department of Energy is sponsoring two programs related to drilling technology. The first is aimed at development of technology that will lead to reduced costs of drilling, completion, and logging of geothermal wells. This program has the official title ''Hard Rock Penetration Mechanics.'' The second program is intended to share with private industry the cost of development of technology that will result in solutions to the near term geothermal well … more

Date: January 1, 1985

Creator: Kelsey, J.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Smoothly waning, symmetrically expanding, cavity-pressure loads in earth materials

An approximate solution for the pressure loading required to expand a spherical cavity in rock and soil targets is derived. A dual characterization of fracture and flow material model is used. Frictional resistance to flow is also included. Non-linear volumetric strain hardening is modeled with bi-linear curves and unloading is assumed to be non-dilative. Applications of this solution form to the prediction of pressure loading on slender, convex-nosed earth penetrators and on spherically-nosed … more

Date: January 1, 1982

Creator: Priddy, T.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Instrument evaluation, calibration, and installation for the heater experiments at Stripa

Borehole instrumentation for the measurement of temperature, displacement, and stress was evaluated, modified, calibrated, and installed in an underground site at Stripa, Sweden where experiments are currently underway to investigate the suitability of granite as a storage medium for nuclear waste. Three arrays of borehole instrumentation measure the thermomechanical effects caused by electrical heaters which simulate the thermal output of canisters of radioactive waste. Because most rock mecha… more

Date: December 1, 1979

Creator: Schrauf, T.; Pratt, H.; Simonson, E.; Hustrulid, W.; Nelson, P.; DuBois, A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geothermal drilling and completion technology development program. Quarterly progress report, January-March 1980

The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

Date: April 1, 1980

Creator: Varnado, S.G. (ed.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Progress with field investigations at Stripa

It is generally agreed that the most practicable method of isolating nuclear wastes from the biosphere is by deep burial in suitable geologic formations. Such burial achieves a high degree of physical isolation but raises questions concerning the rate at which some of these wastes may return to the biosphere through transport by groundwater. Any suitable repository site will be disturbed first by the excavation of the repository and second by the thermal pulse caused by the radioactive decay of… more

Date: February 1, 1980

Creator: Witherspoon, P.A.; Cook, N.G.W. & Gale, J.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Review of the 1979 workshop on thermomechanical modeling for a hard rock waste repository

The 1979 Workshop discussed and considered issues and needs in the areas of Modeling, Laboratory Measurements, Instruments and Field Measurements, and In-situ Tests and Model Validation. A set of conclusions and recommendations was developed, which focused on the necessity of treating the rock mass response to the waste emplaced in it. The conclusions dealt with characterizing the fracture system, determining the mechanical and thermal properties, developing an understanding of the physical pro… more

Date: January 1, 1980

Creator: Holzer, F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hot-dry-rock geothermal-energy development program. Annual report, fiscal year 1981

During fiscal year 1981, activities of the Hot Dry Rock Geothermal Energy Development Program were concentrated in four principal areas: (1) data collection to permit improved estimates of the hot dry rock geothermal energy resource base of various regions of the United States and of the United States as a whole, combined with detailed investigations of several areas that appear particularly promising either for further energy extraction experiments or for future commercial development; (2) suc… more

Date: January 1, 1981

Creator: Smith, M.C. & Ponder, G.M. (comps.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Strain distribution and model for formation of eastern Umtanum Ridge anticline, south-central Washington

Umtanum Ridge in south-central Washington is the topographic expression of a complex anticline within the Yakima Fold system in the Miocene Columbia River Basalt Group. The Yakima Fold system, which is partly contained within the Hanford Site, is an example of a layered basalt sequence folded near the surface of the earth. The Pasco Basin stratigraphic nomenclature is used in this repot. Rockwelll Hanford Operations, under contract to the US Department of Energy, is investigating the feasibilit… more

Date: October 1, 1979

Creator: Price, E.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Geologic, stratigraphic, thermal, and mechanical factors which influence repository design in the bedded salt environment

This report describes the geologic, stratigraphic, thermal, and mechanical considerations applicable to repository design. The topics discussed in the report include: tectonic activity; geologic structure; stratigraphy; rock mechanical properties; and hydrologic properties.

Date: December 1, 1979

Creator: Ashby, J. P.; Nair, O.; Ortman, D. & Rowe, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Physical processes of compaction companion report 1 to simulation of geothermal subsidence

There are a variety of theories, techniques, and parameters in the subsidence literature. Biot's theory, Terzaghi's theory, and the theory of interacting continua (TINC) are used to explain solid-fluid interaction; stress-strain theories range from linear elastic to e-log p to plasticity and pore-collapse theories. Parameters are numerous: void ratio,, permeability, compaction coefficient, pore compressibility, Young's modulus, bulk modulus, shear modulus, Poisson's ratio, Lame coefficients, co… more

Date: March 1, 1980

Creator: Miller, I.; Dershowitz, W.; Jones, K.; Myer, L.; Roman, K. & Schauer, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geology--hydrology of Avery Island Salt Dome

After a review of the geology of the Gulf Coast salt domes, the geology (geomorphology and tectonics) and hydrology of Avery Island Dome, 10 miles south-southwest of New Iberia, Louisiana, were studied in detail. Rock mechanics were studied using grouts and piezometers. 17 figs. (DLC)

Date: July 1977

Creator: Jacoby, C. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geothermal drilling and completion technology development program. Quarterly progress report, April-June 1980

The progress, status, and results of ongoing research and development (R and D) within the Geothermal Drilling and Completion Technology Development Program are reported. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

Date: July 1, 1980

Creator: Varnado, S. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Seismic performance of underground facilities

A workshop was held in Augusta, GA, February 11-13, 1981 to review and assess the state-of-the-art for determining and predicting earthquake damage to underground facilities. The papers presented related to data collection and analysis, modeling, and repository design. Discussion groups addressed seismology, rock mechanics and hydrology, modeling, design, and licensing, siting, and tectonics. Most scientists in attendance believed that enough was known to proceed with site selection, design, an… more

Date: January 1, 1982

Creator: Marine, I W

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Cross-hole investigation of a rock mass subjected to heating

A cross-hole high-frequency acoustic investigation of a granitic rock mass subjected to sustained heating is reported. Compressional and shear-wave velocity measurements along four different paths between four vertical boreholes made prior to turning on the heater, during 398 days of heating and after the heater was turned off correlated well with the presence of fracture zones, in which the fractures were closed by thermal expansion of the rock upon heating. When the rock mass cooled, the velo… more

Date: April 1, 1980

Creator: Paulsson, B.N.P. & King, M.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thermal responses in underground experiments in a dome salt formation

To provide design information for a radwaste repository in dome salt, in-situ experiments with nonradioactive heat sources are planned. Three such experiments using electrical heat sources are scheduled to be carried out in a salt dome. The purpose of these experiments is to acquire rock mechanics data to ascertain the structural deformation due to the thermal load imposed, to study brine migration and corrosion, and to provide thermal data. A data acquisition system is provided with these expe… more

Date: January 1, 1977

Creator: Llewellyn, G.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Geothermal drilling ad completion technology development program. Semi-annual progress report, April-September 1979

The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, and completion technology. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1982 and by 50% by 1986.

Date: May 1, 1980

Creator: Varnado, S.G. (ed.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Reservoir performance in viscoelastic porous media

The mass balance equations for a two-phase two-component fluid system are written for viscoelastic porous media. The resulting equations are approximated by finite differences and the resulting numerical simulator is used to conduct a sensitivity study on the effects of uniaxial viscoelastic deformation in geopressured aquifers. Results of this study indicate that viscoelastic deformation may have considerable influence on the pressure maintenance of these aquifers. A numerical model of the geo… more

Date: January 1, 1982

Creator: Rago, F. M.; Ohkuma, H.; Sepehrnoori, K. & Thompson, T.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Calculated Thermally Induced Displacements and Stresses for Heater Experiments at Stripa, Sweden. Linear Thermoelastic Models Using Constant Material Properties

Thermally induced displacements and stresses have been calculated by finite element analysis to guide the design, operation, and data interpretation of the in situ heating experiments in a granite formation at Stripa, Sweden. There are two full-scale tests with electrical heater canisters comparable in size and power to those envisaged for reprocessed high level waste canisters and a time-scaled test. To provide a simple theoretical basis for data analysis, linear thermoelasticity was assumed. … more

Date: December 1, 1979

Creator: Chan, T. & Cook, N. G. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Brief overview of geophysical probing technology

An evaluation of high-resolution geophysical techniques which can be used to characterize a nulcear waste disposal site is being conducted by the Lawrence Livermore National Laboratory (LLNL) at the request of the US Nuclear Regulatory Commisson (NRC). LLNL is involved in research work aimed at evaluating the current capabilities and limitations of geophysical methods used for site selection. This report provides a brief overview of the capabilities and limitations associated with this technolo… more

Date: February 1, 1982

Creator: Ramirez, A.L. & Lytle, R.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Rock Properties and Their Effect on Thermally-Induced Displacements and Stresses

A discussion is given of the importance of material properties in the finite-element calculations for thermally induced displacements and stresses resulting from a heating experiment in an in-situ granitic rock, at Stripa, Sweden. Comparisons are made between field measurements and finite element method calculations using (1) temperature independent, (2) temperature dependent thermal and thermomechanical properties and (3) in-situ and laboratory measurements for Young's modulus. The calculation… more

Date: February 1, 1980

Creator: Chan, T.; Hood, M. & Board, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department