Prototype Drill for Core Sampling Fine-Grained Perennially Frozen Ground

An expensive drill has been modified to provide researchers with the ability to auger an open hole or to acquire continuous, undisturbed 76-mm-diam core samples of a variety of perennially frozen materials that are suitable for chemical and petrographic analysis. It was developed by field testing in...

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Bibliographic Details
Main Authors: Brockett,B E, Lawson,D E
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1985
Subjects:
Snow
Ice and Permafrost
Machinery and Tools
*AUGERS
*DRILLS
*PERMAFROST
*CORE SAMPLING
CORES
FIELD TESTS
GRAIN SIZE
DEPTH
FREEZING
HOLES(OPENINGS)
SELF CONTAINED
TRANSPORTABLE
LIGHTWEIGHT
TRACKED VEHICLES
SEDIMENTS
CHEMICAL ANALYSIS
CUTTERS
AIR TRANSPORTABLE EQUIPMENT
WINCHES
PETROGRAPHY
TUNGSTEN CARBIDES
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA152388
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA152388
Description
Summary:An expensive drill has been modified to provide researchers with the ability to auger an open hole or to acquire continuous, undisturbed 76-mm-diam core samples of a variety of perennially frozen materials that are suitable for chemical and petrographic analysis. It was developed by field testing in support of research from 1980 to 1983. Operation of the drill is based mainly on using a minimum of power to cut through frozen ground with tungsten carbide cutters on a CRREL coring auger. The ice content, temperature and grain size of the frozen sediments are important variables determining the sampling depth. Perennially frozen sediments with temperatures in the range of -0.5 C to -8.5 C have been continuously cored with this drill. Drilling and sampling are most efficiently conducted when ambient air temperatures are below freezing and the active layer is frozen. The self-contained lightweight drill is readily transportable off-road by helicopter or tracked vehicle, or by towing over roads. It is locally self-mobile by use of a winch. Total cost of the drill and modifications is estimated at approximately $10,000.

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