Experimental stand for investigation of borehole stability during drilling in glacial cover

Abstract

With the increase of drilling depths the borehole penetration in the glacial cover becomes sharply complicated, as the borehole continuously narrows due to ice creep under the conditions of increasing mountain pressure and temperature. Thus, during deep drilling at the Vostok station in Antarctica, ice creep became apparent from a depth of 500 m at an ice temperature of -53°C. ...