UID:
kobvindex_GFZ20190702110707
Format:
v, 34 Seiten
,
Illustrationen
Series Statement:
CRREL Report 85-1
Content:
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.
Note:
CONTENTS
Abstract
Preface
Introduction
Background on development
Drill development and configuration
Equipment
Modifications
Operations
Assembly and disassembly
Field transport and movement
Typical operating procedures
Effect of material properties, weather and water
Depth and hole completion time
Summary
Literature cited
In:
CRREL Report, 85-1
Language:
English
Keywords:
Forschungsbericht
URL:
https://apps.dtic.mil/docs/citations/ADA152388
URL:
https://hdl.handle.net/11681/9352
