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Seismic-source corner frequencies from the depth of burial experiment

Description: The results from the depth of burial experiment (DOB) are consistent with cube-root scaling and with previous observations that the source corner frequency for underground explosions increases with depth. The corner frequencies, however, were overpredicted by Mueller and Murphy (1971) and underpredicted by Denny and Johnson (1991).
Date: November 23, 1998
Creator: Denny, M.D.
Partner: UNT Libraries Government Documents Department

Utilization of near-source video and ground motion in the assessment of seismic source functions from mining explosions

Description: Constraint of the operative physical processes in the source region of mining explosions and the linkage to the generation of seismic waveforms provides the opportunity for controlling ground motion. Development of these physical models can also be used in conjunction with the ground motion data as diagnostics of blasting efficiency. In order to properly address the multi-dimensional aspect of data sets designed to constrain these sources, we are investigating a number of modem visualization tools that have only recently become available with new, high-speed graphical computers that can utilize relatively large data sets. The data sets that are combined in the study of mining explosion sources include near-source ground motion acceleration and velocity records, velocity of detonation measurements in each explosive hole, high speed film, video and shot design information.
Date: April 1, 1995
Creator: Stump, B.W. & Anderson, D.P.
Partner: UNT Libraries Government Documents Department

A Strength and Damage Model for Rock Under Dynamic Loading

Description: A thermodynamically consistent strength and failure model for granite under dynamic loading has been developed and evaluated. The model agrees with static strength measurements and describes the effects of pressure hardening, bulking, shear-enhanced compaction, porous dilation, tensile failure, and failure under compression due to distortional deformations. This paper briefly describes the model and the sensitivity of the simulated response to variations in the model parameters and in the inelastic deformation processes used in different simulations. Numerical simulations of an underground explosion in granite are used in the sensitivity study.
Date: December 1, 1999
Creator: Vorobiev, O.Y.; Antoun, T.H.; Lomov, I.N. & Glenn, L.A.
Partner: UNT Libraries Government Documents Department


Description: An investigation was made to determine the stress field in the salt dome and the stress concentrations on the surface of the small (12-ft diameter) sphere. For the most part, the apparatus and techniques used in the investigation are new and have not been described in other reports. Therefore the theory, concepts, apparatus, and some of the lists made to determine the reproducibility of the apparatus are described briefly. (W.L.H.)
Date: July 29, 1960
Creator: Merrill, R.H.
Partner: UNT Libraries Government Documents Department


Description: Post-shot measurements were made to determine the static field near the shot sites and the volume of the crushed zone of rock surrounding the location of the charges fired during Project HOBO. These measurements were made in connection with the Seismic Detection Program. (W.L.H.)
Date: July 1, 1960
Creator: Merrill, R.H. & Hooker, V.E.
Partner: UNT Libraries Government Documents Department

Phase II Groundwater Flow Model of Corrective Action Unit 98: Frenchman Flat, Nevada Test Site, Nye County, Nevada, Rev. No.: 0

Description: The Phase II Frenchman Flat groundwater flow model is a key element in the ''Federal Facility Agreement and Consent Order'' (FFACO) (1996) corrective action strategy for the Underground Test Area (UGTA) Frenchman Flat corrective action unit (CAU). The objective of this integrated process is to provide an estimate of the vertical and horizontal extent of contaminant migration for each CAU to predict contaminant boundaries. A contaminant boundary is the model-predicted perimeter that defines the extent of radionuclide-contaminated groundwater from underground testing above background conditions exceeding the ''Safe Drinking Water Act'' (SDWA) standards. The contaminant boundary will be composed of both a perimeter boundary and a lower hydrostratigraphic unit (HSU) boundary. The computer model will predict the location of this boundary within 1,000 years and must do so at a 95 percent level of confidence. Additional results showing contaminant concentrations and the location of the contaminant boundary at selected times will also be presented. These times may include the verification period, the end of the five-year proof-of-concept period, as well as other times that are of specific interest. This report documents the development and implementation of the groundwater flow model for the Frenchman Flat CAU. Specific objectives of the Phase II Frenchman Flat flow model are to: (1) Incorporate pertinent information and lessons learned from the Phase I Frenchman Flat CAU models. (2) Develop a three-dimensional (3-D), mathematical flow model that incorporates the important physical features of the flow system and honors CAU-specific data and information. (3) Simulate the steady-state groundwater flow system to determine the direction and magnitude of groundwater fluxes based on calibration to Frenchman Flat hydrogeologic data. (4) Quantify the uncertainty in the direction and magnitude of groundwater flow due to uncertainty in parameter values and alternative component conceptual models (e.g., geology, boundary flux, and recharge).
Date: May 1, 2006
Creator: McCord, John
Partner: UNT Libraries Government Documents Department


Description: The effects of explosion-induced ground motion must be evaluated in planning and executing any nuclear excavation project. For some projects ground motion intensity may dictate the use of less-than-optimum yields to minimize damaging effects. In remote areas, weighing the alternatives of outright purchase of some property or use of smaller yields may be required. The cost of indemnifying owners against damage must be considered in any case. Discussions of the effects of ground motion on three broad types of facilities- engineered structures, residual buildings, and equipment required for the support oi nuclear excavation operations-- are presented. A method of predicting the response of single- and multistoried buildings, the response spectrum technique, is discussed, with emphasis on the application of explosion-induced spectra. Conclusions drawn from several tests of damage to residential-type buildings are presented. Included are data from four investigations of damage caused by commercial and industrial blasting and the results of several studies made in conjunction with underground nuclear detonations. Finally, a survey of damage to the equipment required to carry out excavation projects is summarized. (auth)
Date: January 1, 1964
Creator: Cauthen, L. J., Jr.
Partner: UNT Libraries Government Documents Department