What Does Trenching Mean? Trenching is a construction method that involves digging a narrow trench in the ground for the installation, maintenance, or inspection of pipelines, conduits, or cables.
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What is the purpose of trenching?
In construction, trenches are dug for foundations of buildings, retaining walls and dams, and for cut-and-cover construction of tunnels. In archaeology, the “trench method” is used for searching and excavating ancient ruins or to dig into strata of sedimented material.
What is trench give an example?
1. The definition of a trench is a long, narrow ditch sometimes dug by troops during wartime to hide from enemies. A long narrow ditch dug in World War I to protect troops from being seen by the enemy is an example of a trench. noun.
What is trenching in geology?
Heavy equipment is used to remove the surface soil and expose the bedrock. Trenches or pits are then excavated or blasted into the rock to expose mineralized zones for sampling and testing. Footprint on the Land. Pits are shallow, square shaped holes while trenches are longer, linear and variable in depth.
What are the 4 types of trenches?
- Front-line Trench. This type of trench was also known as the firing-and-attack trench.
- Support Trench. This trench was several hundred yards behind the front-line trench.
- Reserve Trench. The reserve trench was several hundred yards behind the support trench.
- Communication Trench.
What is the difference between trenching and excavation?
What is the difference between an excavation and a trench? OSHA defines an excavation as any man-made cut, cavity, trench, or depression in the Earth’s surface formed by earth removal. A trench is defined as a narrow excavation (in relation to its length) made below the surface of the ground.
How a trench is formed?
Trenches are formed by subduction, a geophysical process in which two or more of Earth’s tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.
What is the synonym for trench?
noun. ( ˈtrɛntʃ) A ditch dug as a fortification having a parapet of the excavated earth. Antonyms. deglycerolize disarrange divest disorganize disorganise call option undeceive. intrenchment fosse communication trench slit trench moat.
Where are trenches found?
Trenches are found on the floor of the sea; however, their common name is deep ocean trenches because they are more often found in the deepest areas of the ocean. Trenches are formed in subduction zones where tectonic plates collide.
What is trenching and pitting?
Pits and trenches can be a quick and cheap way of obtaining lithological, structural and assay information in areas of shallow cover. Pitting to depths of up to 30 m is feasible and, with trenching, forms the simplest and least expensive method of deep sampling but is much more costly below the water table.
What is trenching in mineral exploration?
Trenches are usually employed to expose steep-dipping bedrock buried below shallow overbur-den, and are normally dug across the strike of the rocks or mineral zone being tested. Pitting and trenching are used to see a more complete picture of the rock.
Why are trenches full of water?
Much of the land where the trenches were dug was either clay or sand. The water could not pass through the clay and because the sand was on top, the trenches became waterlogged when it rained. The trenches were hard to dig and kept on collapsing in the waterlogged sand.
How many types of trenches are there?
There were three different types of trenches: firing trenches, lined on the side facing the enemy by steps where defending soldiers would stand to fire machine guns and throw grenades at the advancing offense; communication trenches; and “saps,” shallower positions that extended into no-man’s-land and afforded spots
What are the two methods of trench excavation?
Trench Excavation Methods
- Conventional methods: excavators +/- rock breakers.
- Drill & blast.
- Trenching.
What are the key features of a trench?
Trenches were long, narrow ditches dug into the ground where soldiers lived. They were very muddy, uncomfortable and the toilets overflowed. These conditions caused some soldiers to develop a problem called trench foot. There were many lines of German trenches on one side and many lines of Allied trenches on the other.
What are the types of excavation?
Types of Excavation
- Earth excavation is removal of the layer of soil immediately under the topsoil and on top of rock.
- Muck excavation is removal of material that contains an excessive amount of water and undesirable soil.
- Unclassified excavation is removal of any combination of topsoil, earth, rock, and muck.
When a trench is 4 feet or more in depth?
A stairway, ladder, ramp or other safe means of egress shall be located in trench excavations that are 4 feet (1.22 m) or more in depth so as to require no more than 25 feet (7.62 m) of lateral travel for employees.
Why is 1.2 meter excavation confined space?
The 1.2m rule for trenches used to be in older health and safety regulations and is often still quoted today. The basis of the rule is that, if a trench is under 1.2m deep, then people can enter the trench without the sides of the excavation being supported or battered back.
Where is the deepest trench in the world?
the Pacific Ocean
The Mariana Trench, in the Pacific Ocean, is the deepest location on Earth. According to the Exclusive Economic Zone (EEZ), the United States has jurisdiction over the trench and its resources. Scientists use a variety of technologies to overcome the challenges of deep-sea exploration and explore the Trench.
What is the difference between trenches and ridges?
Ocean ridges are boundaries where plates are being created, whereas trenches are boundaries where plates are being destroyed (subducted).
What is the deepest ocean?
western Pacific Ocean
The deepest part of the ocean is called the Challenger Deep and is located beneath the western Pacific Ocean in the southern end of the Mariana Trench, which runs several hundred kilometers southwest of the U.S. territorial island of Guam. Challenger Deep is approximately 10,935 meters (35,876 feet) deep.