Understanding RE Wall: What it Means

The question asks about the meaning of the abbreviation "RE wall". This term is used in civil engineering, particularly in geotechnical applications related to soil structures.

Let's look at the options provided to understand what "RE wall" signifies:

• Reinforced Earth Wall
• Resistant Earth Wall
• Revetment Earth Wall
• Retaining Earth Wall

Based on common usage and the options provided, "RE wall" refers to a type of earth wall designed to hold back soil or rock. While "Reinforced Earth Wall" (or Mechanically Stabilized Earth - MSE wall) is a very common type of earth wall that fits the description and uses internal reinforcement, the term can also broadly refer to any type of earth wall that is designed to retain soil. Among the given options, "Retaining Earth Wall" is a plausible interpretation, describing the primary function of such a structure.

Explanation of Retaining Earth Wall

A retaining wall is a structure designed and constructed to resist the lateral pressure of soil when there is a desired change in ground elevation that exceeds the angle of repose of the soil. A retaining earth wall is essentially a wall built to hold back soil, preventing it from collapsing or eroding.

These walls are essential in various construction projects, including:

• Creating level areas in sloped terrain.
• Preventing soil erosion.
• Building bridge abutments or culverts.
• Constructing basement walls.

Various types of retaining walls exist, and many of them involve incorporating earth or soil in their structure or using soil for stability behind the facing.

Analyzing the Options

Let's consider why other options might be less suitable based on the provided correct meaning:

• Reinforced Earth Wall: This is a specific *type* of retaining wall where soil is reinforced internally with geosynthetics or metallic strips to increase its stability. While a very common type of RE wall, the term "RE" might be used more broadly in some contexts.
• Resistant Earth Wall: This term isn't standard terminology in geotechnical engineering for a specific type of wall. While retaining walls resist pressure (are "resistant"), this isn't the standard abbreviation.
• Revetment Earth Wall: A revetment is typically a facing on an embankment or shoreline to prevent erosion, often made of stone or concrete. While earth might be part of the structure being protected, "Revetment Earth Wall" isn't the standard term for a retaining structure.

Given the options and the provided correct answer, "Retaining Earth Wall" aligns with the fundamental purpose of an earth wall designed to hold back soil.

Conclusion on RE Wall Meaning

Based on the provided options, RE wall stands for Retaining Earth Wall, referring to a structure primarily designed to retain soil and resist its lateral pressure.

Revision Table: Key Terms

Additional Information: Types of Retaining Walls

While "Retaining Earth Wall" describes the function, retaining walls can be constructed using various materials and methods. Understanding different types can provide broader context:

• Gravity Walls: Rely on their own weight for stability (e.g., stone, concrete, or gabion walls).
• Cantilever Walls: Use a footing to convert horizontal soil pressure into vertical pressure on the ground.
• Counterfort/Buttressed Walls: Similar to cantilever walls but with added supports (counterforts in tension, buttresses in compression) at intervals.
• Sheet Pile Walls: Interlocking steel, vinyl, or timber sheets driven into the ground.
• Bored Pile Walls: Constructed using concrete piles bored into the ground.
• Anchored Walls: Use cables or rods anchored into the soil or rock behind the wall for added stability.
• Reinforced Earth (MSE) Walls: Walls using granular backfill reinforced with horizontal layers of geosynthetics or metal strips, faced with modular blocks or panels.

The term "Retaining Earth Wall" emphasizes the material being retained (earth) and the function (retaining).