Analytic Model for Surface Ground Motion with Spall Induced by Underground Nuclear Tests PDF Download
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Languages : en
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This report provides a detailed presentation and critique of a model used to characterize the surface ground motion following a contained, spalling underground nuclear explosion intended for calculation of the resulting atmospheric acoustic pulse. Some examples of its use are included. Some discussion of the general approach of ground motion model parameter extraction, not dependent on the specific model, is also presented.
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Category :
Languages : en
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Book Description
This report provides a detailed presentation and critique of a model used to characterize the surface ground motion following a contained, spalling underground nuclear explosion intended for calculation of the resulting atmospheric acoustic pulse. Some examples of its use are included. Some discussion of the general approach of ground motion model parameter extraction, not dependent on the specific model, is also presented.
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Category : Power resources
Languages : en
Pages : 366
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Category :
Languages : en
Pages : 62
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Spallation of the ground surface accompanies all underground nuclear explosions of significant yield. This report discusses computer modelling used to investigate the physical processes that govern spallation and the amplitude and wavelength of motion at the free surface under a variety of conditions. Four events are selected: MERLIN which was conducted in desert alluvium; HEARTS which was conducted in tuff beneath the water table in Yucca Flat; TOWANDA which was conducted beneath the water table on Pahute Mesa; and HOUSTON which was conducted above the water table in very dense rock and Pahute Mesa. These span the range of test environments for Los Alamos underground nuclear tests.
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Category : Shock (Mechanics)
Languages : en
Pages : 664
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Category :
Languages : en
Pages :
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An analytical model (the BOTE model) based upon a superposition of the limiting forms for the outgoing stress wave (i.e., a strong shock at early times decaying to a simple acoustic wave at later times) is presented as a means to describe the groundmotion phenomena resulting from underground nuclear explosions. Taking into account the effects of both the porosity and the water content of the surrounding medium, the BOTE model provides good agreement with both calculated and experimental data for times ranging from tens of microseconds to tens of milliseconds, and for distances ranging out to 350 ft/kt . (auth).
Author: W. G. Christopher
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ISBN:
Category : Basalt
Languages : en
Pages : 58
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Project Pre-SCHOONER consisted of four 20-ton nitromethane cratering detonations conducted by the United States Army Engineer Nuclear Crate ring Group as part of the joint Atomic Energy Commission-Corps of Engineers nuclear excavation research program. The experiment was conducted in February 1964 in the basalt of Buck- board Mesa at the Nevada Test Site. High speed photography and target markers were used to measure ground surface motions produced by each of the four detonations. Analysis of the surface motion data indicated that spalling was the principle crater-producing mechanism. The three detonations which produced apparent craters did, however, show varying amounts of second phase surface accelerations. Surface ground zero spall velocities ranged from 100 fps for the detonation at a 66-foot burial 1/3 depth (scaled depth of 236 ft/kt) to 170 fps for the detonation at 1/3 a 42-foot burial depth (scaled depth of 150 ft/kt).
Author:
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Category : Nuclear energy
Languages : en
Pages : 934
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ISBN:
Category : Science
Languages : en
Pages : 912
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Author:
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ISBN:
Category : Blast effect
Languages : en
Pages : 506
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Author: Geological Survey (U.S.)
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Category : Geophysics
Languages : en
Pages : 1028
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