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Education

Published on March 6, 2014

Author: hamzaaaaaah

Source: slideshare.net

Advancement In Retaining wall Submitted by:Shamimur Rahman B.Arch.III Yr.

 Retaining Walls  A retaining wall is a wall built to support or prevent the advance of a mass of earth or water.  More beautifying form of negative drainage correction.

What is a Retaining Wall A retaining wall is generally defined as a vertical wall that holds back earth. Uses of Retaining Wall A retaining wall for roadside embankments A retaining wall can separate older roads from highways A house retaining wall for the garage A retaining wall helps keep river banks from eroding A retaining wall to keep earth from stairwells and driveways Retaining Wall Construction Some retaining wall construction types are: A concrete retaining wall An interlocking block retaining wall A Wood retaining wall An Insulated Concrete Form retaining wall or ICF retaining wall After the retaining wall construction is complete, The retaining wall is then backfilled on one side only. Backfilling on one side of the retaining wall creates an extreme amount of pressure. This pressure comes from the weight of the earth and the moisture in the soil. This pressure can result in cracks and water seepage in the retaining wall. Some of those effects are: Green slime Efflorescence Mineral deposits Rust from wall tie Freeze and thaw cycles also creates extra stress on a retaining wall. 3

Types of Retaining Walls -Gravity walls -Pre-cast crib walls -Gabion walls -Reinforced concrete walls -Sheet pile walls -MS walls (mechanically stabilized) - Soil nailing 4

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Reinforced earth wall structures are a system whereby mesh layers are introduced into the soil backfill as a reinforcement to provide stability. The system can use mesh, gabions, concrete block or panels as a facing. The types of mesh reinforcement selected can be geogrid (polymer mesh), woven wire hexagonal steel mesh (same as rock netting), welded wire steel mesh or steel strap/ladder systems. 6

1. Abutment Retaining Wall Design 2.Cantilever Wall 3.Gabion 4.Masonry Wall 5.MSE wall – Mechanically Stabilized Earth Walls 6.Nailed Slopes 7.Prefab Wall 8.Redi Rock Wall 7

Crib Walls. Crib walls are made up of interlocking individual boxes made from timber or pre-cast concrete. The boxes are then filled with crushed stone or other coarse granular materials to create a freedraining structure. There are two basic types of crib wall: - Timber, and - Reinforced pre-cast concrete. 8

Gabion walls. Gabions are multi-celled, welded wire or rectangular wire mesh boxes, which are then rock filled, and used for construction of erosion control structures and to stabilize steep slopes. Their applications include, - Retaining walls, - Bridge abutments, -Wing walls, - Culvert headwalls, - Outlet aprons, - Shore and beach protection walls, and - Temporary check dams- dams. 9

A crane is lifting a wall form to cast this reinforced-retaining wall. 10

The first MSE wall built in Florida was for Metro-Rail’s Medley Yard. The first step was to build this temporary soldier pile and lagging wall to retain the Hialeah Expressway (NW 74th Street). 11

Reinforced Earth Walls ~ using geofabrics to strengthen the soil 12 12

Soil Nailing ~ steel rods placed into holes drilled into the walls and grouted 13 13

Geofabrics ~ used for reinforcement, separation, filtration and drainage in roads, retaining walls, embankments… 14 Geofabrics used on Pacific Highway 14

Typical Safety Factors Type of Design Safety Factor Probability of Failure Earthworks 1.3-1.5 1/500 Retaining structures 1.5-2.0 1/1500 Foundations 2.0-3.0 1/5000 15

Polymeric reinforcement use of geo-textile made from synthetic polymers using polyethylene, polyamides, polyester, polypropylene; woven, non-woven or extruded bi-axial or uni-axial grids, sheets, etc, for reinforced fill/soil walls. 16

Mechanically Stabilized Earth (MSE) Walls. These walls are among the most economical, and most commonly constructed. Contrary to other types, the MSE walls are supported by the soil, and not the other way around. They are supported by selected fills (granular) and held together by reinforcements, which can be either metallic strips or plastic meshes. The MSE Categories. A) Panel Walls, B) Concrete Block Walls, and C) Temporary Earth Walls. 17

A typical MSE wall provides the advantage of cheaper walls 18

Sheet Pile Walls. Used to build continuous walls for waterfront structures and for temporary construction wall heights > 6 m if used with anchors. Can be made of steel, plastics, wood, pre-cast concrete. The advantages of using steel sheet-piling: 1. Provides higher resistance to driving stresses; 2. Is of an overall lighter weight; 3. Can be reused on several projects. 4. Provides a long service life above or below the water table 5. Easy to adapt the pile length by either welding or bolting . 6. Their joints are less apt to deform during driving. This bridge is being widened, and the traffic is maintained with this temporary sheeting. 19

Sheet Piles ~ resist lateral earth pressures ~ used in excavations, waterfront structures, .. ~ interlocking sections 20

Sheet Piles ~ used in temporary works 21

1. Abutment Retaining Wall Design 2.Cantilever Wall 3.Gabion 4.Masonry Wall 5.MSE wall – Mechanically Stabilized Earth Walls 6.Nailed Slopes 7.Prefab Wall 8.Redi Rock Wall 22

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