Also found in: Dictionary, Thesaurus, Idioms, Wikipedia.
Related to trench: Mariana Trench


see oceanocean,
interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. See also oceanography.
..... Click the link for more information.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in mining, an open excavation in the ground. A trench has a trapezoidal cross section, and its length is many times greater than its width.

Sloping main, or primary, trenches are used in stripping an opencut mine or an individual area of such a mine, and also in establishing a haulage system to link the working levels with the surface. A horizontal, or cross-sectional, trench is designed to establish the initial working front at a bench. In the case of irregular mountain terrain, a trench may have an irregular cross section (hasty trench).

Main trenches are classified on various bases. In terms of their relationship to the contours of the pit, they may be external or internal. They may be of the individual type (providing haulage for a single level), the group type (serving several levels), or the general type (for all working levels in the pit). On the basis of the traffic flow, they are classified as single trenches, with two-way traffic, and paired trenches, with one-way traffic.

The width of a horizontal trench depends on the location of the haulage system and excavation equipment in the horizon being stripped. The depth of a horizontal trench corresponds to the height of the horizon to be stripped. The optimum depth of an inclined main external trench is 50–60 m.

In pits with soft rock, trenches are excavated using multibucket excavators, dragline excavators, or scrapers; single-bucket excavators (trenchers) are used in pits with hard rock. Ejection explosions may be used in digging a trench. If conditions permit, the stripped rock is placed on the surface on one or both sides of the trench; otherwise, it is moved by vehicles to spoil banks.

The rate of excavation of trenches depends largely on the time required for construction of the pit and, in sloped and steeply inclined deposits, also on the productivity of the pit.

Trenches are also used in construction, for the laying of pipelines and cables.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A narrow, straight, elongate, U-shaped valley between two mountain ranges.
A narrow stream-eroded canyon, gulley, or depression with steep sides.
A long, narrow, deep depression of the sea floor, with relatively steep sides. Also known as submarine trench.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


2. A housing, 1.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
While the trench depth in the vicinity of the swale reached up to 3 m, the average trench depth was only 0.9 m.
OSHA proposed penalties of $212,158 for violations of its trench safety standards.
Damart beige trench PS79 The trench trend went beyond outerwear too - we counted about 50 shades of beige throughout fashion months, with models often clad head to toe in a variety of neutral hues.
beige trench The trench trend went beyond outerwear too - we counted about 50 shades of beige throughout fashion months, with models often clad head to toe in a variety of neutral hues.
Hepburn's classic trench coat is the ultimate between-seasons outerwear but there were plenty of modern reinventions on offer on the SS19 catwalks.
Trench posted about her experience on her Facebook page.
"Combining high-performance, lightweight Fibrelite lids with our low-cost precast trench bases delivers a very high-value solution for our customers," says George Schurr, Trenwa's president.
Alexa Chung wore a red patent version with the classic check lining on the FROW, proving a trench can look both modern and stylish.
Denim trench, PS28 @ Fashion World, monochrome bag, PS24 @ M&Co THIS structured trench is a supersmart option for the office.
To give them a fuller, more informed experience, the brand has mounted 'Tale of a Trench Coat,' a traveling exhibit that kicked off in Seoul before heading to Tokyo and making a two-week stop in the newly opened Burberry store at Ion Orchard.