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单词 trench
释义
IdiomsSeetrench mouth

trench


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.
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Trench

 

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.

IU. I. ANISTRATOV

trench

[trench] (geography) A narrow, straight, elongate, U-shaped valley between two mountain ranges. A narrow stream-eroded canyon, gulley, or depression with steep sides. (geology) A long, narrow, deep depression of the sea floor, with relatively steep sides. Also known as submarine trench.

trench

1. A creep trench. 2. A housing, 1.

trench


Related to trench: Mariana Trench
  • all
  • noun
  • verb

Synonyms for trench

noun ditch

Synonyms

  • ditch
  • cut
  • channel
  • drain
  • pit
  • waterway
  • gutter
  • trough
  • furrow
  • excavation
  • earthwork
  • fosse
  • entrenchment

Synonyms for trench

noun a ditch dug as a fortification having a parapet of the excavated earth

Related Words

  • approach trench
  • communication trench
  • ditch
  • entrenchment
  • intrenchment
  • fire trench
  • fosse
  • moat
  • slit trench

noun a long steep-sided depression in the ocean floor

Synonyms

  • oceanic abyss
  • deep

Related Words

  • natural depression
  • depression

noun any long ditch cut in the ground

Related Words

  • ditch
  • furrow

verb impinge or infringe upon

Synonyms

  • impinge
  • encroach
  • entrench

Related Words

  • take advantage
  • trespass

verb fortify by surrounding with trenches

Related Words

  • fort
  • fortify

verb cut or carve deeply into

Related Words

  • cut

verb set, plant, or bury in a trench

Related Words

  • lay
  • place
  • put
  • set
  • position
  • pose

verb cut a trench in, as for drainage

Synonyms

  • ditch

Related Words

  • hollow
  • excavate
  • dig

verb dig a trench or trenches

Related Words

  • dig
  • dig out
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更新时间:2024/12/24 3:33:24