Accession Number : AD0681218

Title :   ROTARY DRILLING AND CORING IN PERMAFROST. PART I. PRELIMINARY investigation, FORT CHURCHILL, MANITOBA.

Descriptive Note : Technical rept.,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s) : Lange,G. Robert

Report Date : NOV 1968

Pagination or Media Count : 27

Abstract : A small rotary drill rig was instrumented and used at Fort Churchill, Manitoba, to investigate the problems of drilling and coring in permafrost. Small diameter augers were also tested. Adequate rates of penetration were easily achieved. However, difficulties were encountered when hole walls and core were thawed by warm drilling fluid. Some success was achieved when coring with water cooled by ice. It was concluded that the feasibility of using a low freezing point liquid and/or compressed air and a portable refrigerator should be investigated. (Author)

Descriptors :   (*PERMAFROST, DRILLING), DRILLING MACHINES, DRILLS, SITE SELECTION, ICE, STATISTICAL ANALYSIS, CIVIL ENGINEERING, MANITOBA

Subject Categories : Snow, Ice and Permafrost
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE