heading-overhand bench method
heading-overhand bench method[¦hed·iŋ ′ō·vər‚hand ′bench ‚meth·əd]
A tunneling method in which the heading is the lower part of the section and is driven at least a round or two in advance of the upper part (bench), which is taken out by overhand excavating. Also known as inverted heading and bench method.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.