overbreak

overbreak

[′ō·vər‚brāk]
(civil engineering)
Rock excavated in excess of the neat lines of a tunnel or cutting. Also known as backbreak.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

overbreak

Any excavation beyond the limits set by the neat line.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
If continuously forced toward the same side of the wall, overbreak occurs and the bit naturally wanders in that direction.
In [18, 19], artificial neural networks were combined with multiregression in order to optimize overbreak prediction.
ABSTRACT: Discontinuities are an integral part of the rock masses and pose special problems in blasting operations in mining and civil industries resulting in high excavation cost due to underbreak and overbreak problems.
Occurrence mode Comprehensive mode Related indexes Affects the limit support stress ratio (B1) Basic indexes Change of strata (B2) (no.) Overbreak of the affected strata (B3) Shield-excavating equipment design (D1) Design indexes Shield-pushing equipment design (D2) (no.) Strata adaptability of the shield (D3) Level of the construction technology (C1) Construction Construction period (C2) indexes (no.) Construction environment (C3) Control measures (C4) The limit support stress ratio is the ratio of the value of limit support stress to original lateral geostress, where the limit support stress refers to the minimum stress that can support face stability.
Any dilution from overbreak also contains lower grade mineralisation that has been quantified by estimation against the Resource model
Zip-It bags from Overbreak LLC, Sun Valley, Calif., come in a variety of sizes and, since they start out so small, you can bring more than one on road trips.
Possible applications, amongst others, include milling of trenches down to a width of 700 mm -- true to profile and without unnecessary overbreak, tunnelling, demolition and asphalt cutting.
It automatically scans overbreak and underbreak to save valuable time during the drilling cycle, helping customers develop more meters every month.
LineChaserz, from Overbreak LLC, Sun Valley, Calif., are among the hottest new vehicles to race onto the market in years.