WorldCat Identities

United States Army Engineer Nuclear Cratering Group

Overview
Works: 93 works in 107 publications in 1 language and 290 library holdings
Genres: Methods 
Roles: Originator
Classifications: TA7.W34,
Publication Timeline
Key
Publications about United States Publications about United States
Publications by United States Publications by United States
Most widely held works about United States
 
Most widely held works by United States
Analytical and graphical methods for the analysis of slopes in rock masses by A. J Hendron ( Book )
3 editions published between 1971 and 1980 in English and held by 25 WorldCat member libraries worldwide
In this report the methods of analyzing the static stability of rock slopes cut by a three-dimensional network of discontinuities are given. The general use of vector analysis to solve these problems analytically is described and a method utilizing stereonets to solve these problems graphically is also given. For both the graphical and analytical methods the general analysis of slopes cut by one, two, or three sets of discontinuities is presented which can take into account the porepressures acting on the discontinuities and external forces acting on the slope. Detailed examples are given to illustrate both the graphical and vector methods of analysis. The dynamic stability of slopes is also treated in this report. It is shown that the dynamic resistance of a three-dimensional rock slope can be calculated by either the graphic-stereonet method or the analytic vector analysis method. The dynamic resistance can then be used to estimate the movement of the slope under dynamic loading using a procedure given by Newmark (1965). A criterion is then given for determining if the calculated movement of the rock slope is acceptable or harmful. (Author)
The behavior of sands under seismic loading conditions by Marshall L Silver ( Book )
4 editions published in 1969 in English and held by 14 WorldCat member libraries worldwide
The volume change characteristics and the dynamic stress-strain properties of dry sand subjected to cyclic shear strains have been investigated and used to check the applicability of a simple method for predicting the vertical settlements due to compaction in layers of dry cohesionless soils subjected to seismic loading conditions. Dynamic testing of a medium quartz sand, performed by repeated load simple shear equipment, indicated that the shear modulus increased slightly with increasing numbers of cycles and with increasing relative density and decreases significantly with increasing values of shear strain amplitude. Modulus values determined near the upper limit of shear strain amplitude that might be expected to be induced by seismic shaking (0.1 percent) were as much as 40 percent lower than modulus values obtained at the lowest values of shear strain that were investigated (0.01 percent). (Author)
Project Pre-GONDOLA II, survival of hypothetical preemplaced charges by C. E Joachim ( Book )
1 edition published in 1968 in English and held by 12 WorldCat member libraries worldwide
Stress and particle velocity (horizontal and vertical) data were obtained from a 140-ton nitromethane row-charge detonation in a saturated clay-shale. The charge row consisted of two 40-ton and three 20-ton charges placed in a row with 80 ft between each charge. The charge line ran S 10 deg. W from the center of the existing Pre-GONDOLA I Charlie crater with the first charge 105 ft from the center. Three sand-filled survival holes 80 ft apart were located in line with the charge row at the south end, the first hole being 105 ft from the closest charge. Gages were placed at depths varying from 60 to 70 ft in the survival holes. The unsaturated sand in the survival holes had a much lower impedance (rho c) than the surrounding Bearpaw clay-shale. This impedance mismatch resulted in a reflective interface that greatly reduced the incident stress and motion measured at the survival hole gages. Initial peak horizontal velocity, input from charges H and I (approximately 60 tons), compares well with the 20-ton charge data obtained from Pre-GONDOLA I and the main gage line of Pre-GONDOLA II. The closest survival hole (J) appears to have sustained damage, although additional data would be required to assess the extent. The remaining two survival holes (K and L) appear to have sustained light damage but would be usable. (Author)
Selected methods for analyzing the stability of crater slopes by D. C Banks ( Book )
1 edition published in 1968 in English and held by 10 WorldCat member libraries worldwide
The results of a study to select methods for analyzing the stability of crater slopes are presented in this report. Information is given on the nature of input required, such as crater geometry, unit weights, shear strength, and seepage pressures. The selected methods are discussed in detail, and examples of their application are presented. The report does not describe all methods which are found in literature, although these were reviewed during the study. The three selected methods presented are : (a) the Bishop method of slices for circular slip surfaces; (b) the extension of Bishop's method to composite failure surfaces as proposed by Janbu and Nonveiller, and (c) the Seed and Sultan method of wedges. These methods were selected as representative of the best available limiting equilibrium procedures. (Author)
Application of finite element method in determining stability of crater slopes by J. B Palmerton ( Book )
2 editions published between 1968 and 1972 in English and held by 10 WorldCat member libraries worldwide
The investigations reported herein comprise studies to evaluate applicability of the finite element method to stability analysis of explosively excavated slopes. A finite element program based on nonlinear material properties was developed during this study. The program incorporates a capability to simulate incremental constructin of slopes of arbitrary geometry either by excavation or by building up. The stress-strain relationships of materials forming the slope and its foundations are approximated by hyperbolic curves. The hyperbolic curves are asymptotic to the yield strength of the materials as defined by Mohr-Coulomb strength parameters. Initial states of stress may be incorporated into the analyses. Several examples of simple slopes under various initial states of stress were analyzed. Additional examples were a symmetrical, homogeneous embankment on a rigid foundation and hypothetical row crater excavation slope. Stresses and displacements for the different examples are presented along with a method for determining the factor of safety of a slope from nonlinear stress analysis. (Author)
Initiation of failure in slopes in overconsolidated clays and clay shales by Ioannis V Constantopoulos ( Book )
2 editions published in 1971 in English and held by 9 WorldCat member libraries worldwide
The conditions leading to the initiation of failure in slopes of overconsolidated clay or clay shale are investigated by means of two finite element programs. The analysis is two-dimensional and assumes plane strain in a homogeneous semi-infinite mass. The material is assumed to be linearly elastic and isotropic with body forces. No pore pressure effects are analyzed. The effects of initial stress ratio, slope angle, and available friction, are investigated for two smooth bottom models and the one rough bottom model. The results are presented in a dimensionless ratio involving the cohesion required to prevent the beginning of failure and the overburden stress at the toe before excavation
Seepage characteristics of explosively produced craters in soil and rock by Walter C Sherman ( Book )
3 editions published between 1969 and 1970 in English and held by 9 WorldCat member libraries worldwide
The report contains a review of the permeability characteristics of soil and rock formation in both disturbed and undisturbed conditions which are likely to occur in the zones surrounding craters. The report presents methods of determining permeability and tabulates typical values of permeability in a variety of materials. Factors which affect the seepage characteristics of craters are discussed and a few examples are presented to illustrate the influence of seepage on stability calculations. The data indicate that laminar flow conditions will prevail in soil and rock formations dependent upon the size of the pore opening and velocity gradient. For a given pore opening, a critical gradient exists above which the flow is found to be turbulent; the technique of constructing flow nets for turbulent flow is illustrated in the report. The correct assessment of seepage conditions in the zones surrounding a crater will depend to a large extent upon the correct evaluation of boundary conditions such as geological discontinuities and sources of seepage
Project TANK TRAP : a field evaluation of nuclear terrain barriers ( Book )
1 edition published in 1969 in English and held by 8 WorldCat member libraries worldwide
Construction techniques and costs for emplacement of nuclear explosives in disturbed media by James L Hair ( Book )
1 edition published in 1969 in English and held by 8 WorldCat member libraries worldwide
The purpose of this report is to discuss the feasibility of emplacement construction through disturbed crater media produced by underground explosions. The primary use for these shafts will be for emplacement of nuclear explosives in order to extend a partially completed nuclear excavation or modify the geometry of an existing crater. A secondary usage will be to provide access for recovery of previously buried but undetonated devices. The area which is expected to provide the greatest potential for this type of emplacement will be civil works projects where nuclear explosions are used as a construction tool. (Author)
Variation in angle of internal friction with confining pressure by D. C Banks ( Book )
1 edition published in 1969 in English and held by 8 WorldCat member libraries worldwide
The report summarizes published results of triaxial compression tests on cohesionless materials at high confining pressures. The data presented herein indicate a curved strength envelope, resulting in a decrease in angle of internal friction with increase in normal stress. An analysis of the data is made and a functional relation is presented for the phi sub o angle (angle of maximum stress obliquity) in terms of normal stress on the failure plane. The significance of a curved strength envelope is investigated for the stability of infinite, simple finite, and crater slopes composed of dry cohesionless material. Preliminary analyses for the case of a partially submerged crater slope are also presented. The analyses indicate that a deep failure surface may be more critical than a shallow surface when the phenomenon of a curved strength envelope is considered. Empirical stable slope data abstracted from a letter concerning canal excavation by nuclear cratering are presented in Appendix A. (Author)
Project Pre-Schooner, PNE 501 F : stem design and shotcrete, grout, and concrete support by K. L Saucier ( Book )
1 edition published in 1964 in English and held by 7 WorldCat member libraries worldwide
Study of explosives for lunar applications by U.S. Army Engineer Nuclear Cratering Group ( Book )
1 edition published in 1971 in English and held by 7 WorldCat member libraries worldwide
Project Pre-Buggy, PNE 302 : emplacement and firing of high-explosive charges and crater measurements by Allen D Rooke ( Book )
1 edition published in 1965 in English and held by 7 WorldCat member libraries worldwide
Preshot geological and engineering conditions at the Project Flivver site, Nevada Test Site by Louis D Carter ( Book )
1 edition published in 1967 in English and held by 7 WorldCat member libraries worldwide
The site of the Flivver experiment is in basalt on the central ridge of Buckboard Mesa, Nevada Test Site. A soil layer averaging 2 feet thick covers the site. The basalt, which is about 237 feet thick at the Flivver site, can be divided into three units: an upper, vesicular unit; a middle, dense unit; and a thin, basal vesicular unit. Deformation of vesicles and concentration of vesicles into layers during viscous flowage have imparted a pronounced layering to the basalt. The orientation of these layers indicates that the major structure of the ridge is cylindrical. Minor folding in the upper portion of the flow complicates this structure. The trend of the ridge and the attitudes of flow layers indicate that the flow curved eastward as it flowed south-southeast across the site. (Author)
Quarrying with nuclear explosives by Aleksandar Sedmak Vesić ( Book )
1 edition published in 1970 in English and held by 7 WorldCat member libraries worldwide
Engineering properties of nuclear craters : report 1 : site selection investigations, wet medium cratering experiments by Roger T Saucier ( Book )
1 edition published in 1965 in English and held by 6 WorldCat member libraries worldwide
Investigations were conducted to select a site suitable for producing craters in a saturated cohesive medium by small-scale high-energy detonations. According to prescribed criteria, the ideal site would be a large (200 acres or more), cleared, moderately flat tract of Federally owned land characterized by soft, homogeneous clays to a minimum depth of 40 feet. An evaluation of the U.S. by physical divisions revealed that suitable sites might occur in four general areas, i.e. (1) the Lake Bonneville area, (2) the Lake Agassiz area, (3) the Great Lakes area, and (4) the Lower Mississippi Valley area. Acquisition and analyses of pertinent data on these areas indicated a need for field reconnaissances except in the case of the Great Lakes area which was eliminated from further consideration because of heterogeneous soil deposits. A reconnaissance of the Lake Bonneville area indicated the presence of apparently favorable test site conditions in a portion of the Dugway Proving Ground, Utah. The Dugway site was concluded to be the most suitable for the project. (Author)
Engineering properties of nuclear craters : report 5 : residual shear strength of weak shales by H. G Herrmann ( Book )
1 edition published in 1966 in English and held by 6 WorldCat member libraries worldwide
The report is concerned with the laboratory determination of the residual shear strength of weak shales such as might be encountered in construction within the Canal Zone. This laboratory measurement is proposed mainly as in index property to estimate the potential for shales or deeply weathered rocks to lose substantial strength with time. In addition to the residual strength parameter, five other index properties are outlined to form a comprehensive means for expediently evaluating potential loss of strength. By definition, the residual shear strength is a constant for any given soil regardless of stress history, and is the lowest 'ultimate' strength. In practice, however, the laboratory measurements of residual strength can vary simply because of failure to reach this lowest strength. The main effort in this present research is to develop the equipment and testing procedures to reliably measure residual strength. It was found that the repeated direct shear test, with about 30 repetitions of loading, on mechanically disintegrated and resedimented samples resulted in an adequate index property test. The results of comprehensive testing of two Canal Zone shales (from the Cucaracha and the Culebra formations), Pierre shale from the Oahe damsite in South Dakota and a kaolinite clay are contained in the report. (Author)
Survey of slope failures in reservoirs by Walter C Sherman ( Book )
1 edition published in 1968 in English and held by 6 WorldCat member libraries worldwide
Engineering properties of nuclear craters : report 3 : review and analysis of available information on slopes excavated in weak shales by R. C Hirschfeld ( Book )
1 edition published in 1965 in English and held by 6 WorldCat member libraries worldwide
This report is concerned with the slope stability problems which will arise if a new channel is excavated through the types of weak shale encountered along the present panama Canal. It includes (a) a discussion of the need for slope stability analyses for new routes, and the approaches which might be used to obtain the necessary data; (b) a review of past experience with slopes in the field and with laboratory tests, especially experience with the present Panama Canal; and (c) a description of some new studies, including first attempts at reanalysis of the landslide experience at the Panama Canal and development of new laboratory test equipment
Settlement of fallback materials by Walter C Sherman ( Book )
1 edition published in 1968 in English and held by 5 WorldCat member libraries worldwide
 
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Audience level: 0.64 (from 0.00 for Seepage ch ... to 1.00 for Constructi ...)
Alternative Names
Engineer Nuclear Cratering Group
Engineer Nuclear Cratering Group United States, Army
NCG
NCG Abkuerzung
United States. Army. Engineer Nuclear Cratering Group
United States Engineer Nuclear Cratering Group
US Army Engineer Nuclear Cratering Group
US Army Engineer Nuclear Cratering Group Unveraenderte Form
Languages
English (30)