EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61
Spherical and cylindrical charges of 1, 4, 8, 32, 256 and 2560 lb were exploded in frozen silt near Fairbanks, Alaska, to investigate the applicability of lambda scaling for placing charges in frozen ground. One hundred and thirty holes, ranging from 3 to 6 in. in diameter, and 2 to 6 ft in depth, w...
Main Author: | |
---|---|
Other Authors: | |
Format: | Text |
Language: | English |
Published: |
1965
|
Subjects: | |
Online Access: | http://www.dtic.mil/docs/citations/AD0616314 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0616314 |
id |
ftdtic:AD0616314 |
---|---|
record_format |
openpolar |
spelling |
ftdtic:AD0616314 2023-05-15T17:57:57+02:00 EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 MCCoy,J. E. COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H 1965-02 text/html http://www.dtic.mil/docs/citations/AD0616314 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0616314 en eng http://www.dtic.mil/docs/citations/AD0616314 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS *PERMAFROST EXPLOSIVE CHARGES ALASKA EARTH HANDLING EQUIPMENT COMPRESSED AIR DRILLS SPHERES CRATERING DETONATIONS COLD WEATHER TESTS EXCAVATION Text 1965 ftdtic 2016-02-21T21:20:24Z Spherical and cylindrical charges of 1, 4, 8, 32, 256 and 2560 lb were exploded in frozen silt near Fairbanks, Alaska, to investigate the applicability of lambda scaling for placing charges in frozen ground. One hundred and thirty holes, ranging from 3 to 6 in. in diameter, and 2 to 6 ft in depth, were drilled with a truck-mounted core drill. Compressed air, passed through an air-to-air heat exchanger to cool it below 25F, was used as a drilling fluid. Charge emplacement, stemming, and detonation are also described. Six basic series were fired which, except for the 2560-lb shots, consisted of two spheres and two cylinders buried at each of six scale depths. The crater volume was calculated by the centroid-volume method. A planimeter was used to measure the area of two mutually perpendicular cross sections through the center of the blast hole. Upon detonation of charges of a given weight at increasing depths, the resultant crater will increase to a maximum and rapidly drop off and disappear. At depths slightly beyond optimum, lambda scaling does not apply and the results are indeterminate. (Author) Available copy will not permit fully legible reproduction. Reproduction will be made if requested by users of DDC. Copy is available for public sale. Text permafrost Alaska Defense Technical Information Center: DTIC Technical Reports database Fairbanks Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
*PERMAFROST EXPLOSIVE CHARGES ALASKA EARTH HANDLING EQUIPMENT COMPRESSED AIR DRILLS SPHERES CRATERING DETONATIONS COLD WEATHER TESTS EXCAVATION |
spellingShingle |
*PERMAFROST EXPLOSIVE CHARGES ALASKA EARTH HANDLING EQUIPMENT COMPRESSED AIR DRILLS SPHERES CRATERING DETONATIONS COLD WEATHER TESTS EXCAVATION MCCoy,J. E. EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 |
topic_facet |
*PERMAFROST EXPLOSIVE CHARGES ALASKA EARTH HANDLING EQUIPMENT COMPRESSED AIR DRILLS SPHERES CRATERING DETONATIONS COLD WEATHER TESTS EXCAVATION |
description |
Spherical and cylindrical charges of 1, 4, 8, 32, 256 and 2560 lb were exploded in frozen silt near Fairbanks, Alaska, to investigate the applicability of lambda scaling for placing charges in frozen ground. One hundred and thirty holes, ranging from 3 to 6 in. in diameter, and 2 to 6 ft in depth, were drilled with a truck-mounted core drill. Compressed air, passed through an air-to-air heat exchanger to cool it below 25F, was used as a drilling fluid. Charge emplacement, stemming, and detonation are also described. Six basic series were fired which, except for the 2560-lb shots, consisted of two spheres and two cylinders buried at each of six scale depths. The crater volume was calculated by the centroid-volume method. A planimeter was used to measure the area of two mutually perpendicular cross sections through the center of the blast hole. Upon detonation of charges of a given weight at increasing depths, the resultant crater will increase to a maximum and rapidly drop off and disappear. At depths slightly beyond optimum, lambda scaling does not apply and the results are indeterminate. (Author) Available copy will not permit fully legible reproduction. Reproduction will be made if requested by users of DDC. Copy is available for public sale. |
author2 |
COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H |
format |
Text |
author |
MCCoy,J. E. |
author_facet |
MCCoy,J. E. |
author_sort |
MCCoy,J. E. |
title |
EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 |
title_short |
EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 |
title_full |
EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 |
title_fullStr |
EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 |
title_full_unstemmed |
EXCAVATIONS IN FROZEN GROUND, ALASKA, 1960-61 |
title_sort |
excavations in frozen ground, alaska, 1960-61 |
publishDate |
1965 |
url |
http://www.dtic.mil/docs/citations/AD0616314 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0616314 |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Fairbanks Lambda |
geographic_facet |
Fairbanks Lambda |
genre |
permafrost Alaska |
genre_facet |
permafrost Alaska |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/AD0616314 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766166463630016512 |