| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To determine a surface of bedrock directly from an analytic value of drilling data. <P>SOLUTION: In continuous underground wall construction, a bedrock determination method by analyzing drilling data of a preceding drilling work using a drilling machine performs analysis of a current value and a slung load of the drilling machine for the preceding drilling work and determination of a position of bedrock based on a condition that the current value is equal to or larger than a prescribed value and the slung load is equal to or lower than the prescribed value. The bedrock determination method uses an analytic value defined by, the analytic value FA=äthe current value×(a total weight of a drill-the slung load)}/a coefficientγ, where the coefficientγis an index coefficient to determine a bedrock layer, and determines the bedrock layer when the analytic value FA is larger than 1. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
