Mass Concrete Retaining Wall Design

Because of their large mass. Allowable stress design lateral loads plain concrete masonry retaining wall unreinforced concrete masonry designed to resist sliding by using reinforcement. Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider.

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Gravity retaining walls depend on their own weight and any soil resting on the concrete in resisting lateral earth forces.

Mass concrete retaining wall design.

They are generally economical up to 10 feet in height for cast concrete structures. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. Gravity poured concrete retaining walls. Counterfort retaining walls are more economical than cantilever walls for heights above 25 ft.

F c 3000 psi fy 60 ksi natural soil development of structural design equations. Ce 437 537 spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. Another type of gravity wall is the crib retaining wall which comprises a system of interlocking header and stretcher blocks to retain the granular fill that provides the mass to the wall. Two equations are developed.

In this example the structural design of the three retaining wall components is performed by hand. Soil mechanics simplified 4. Try 1400mm thick wall. Ncma tek national concrete masonry association an information series from the national authority on concrete masonry technology concrete masonry gravity retaining wallstek 15 6 structural 1995 keywords.

Forces on retaining walls 6. The base is divided into two parts the heel and toe. Building codes and retaining walls 5. Design tanδ tan 20º or 0 75xdesign tanφ 0 364 or 0 503 design tanδ 0 364 from table design φ 33 8º design δ 20º ka 0 242 10kn m surcharge on retained soil behind wall.

Retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. P w due to active pressure surcharge wall self weight 1 wall self weight 2 weight of soil wall friction ia m 0 5 x 0 242 x 18 x 2. Both proprietary block and crib retaining walls must be built on an in situ concrete foundation or on a compacted base course. Sketches of the retaining wall forces should be considered to properly distinguish the different forces acting on our retaining wall as tackled in the previous article retaining wall.

The blocks are interlocked by a key joint precast into the blocks. Reinforced concrete cantilever retaining wall analysis and design aci 318 14 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. Design procedure overview 3. Construction is mortar less and an experienced crew can place up to 80m2 of wall per day.

The graviti block retaining wall system comprises large precast permeable mass concrete blocks manufactured under stringent quality control. Earthquake seismic design 7. Soil bearing and stability 8. The no fines mix aids resistance to shearing by increasing friction between units and the permeability helps to relieve hydrostatic pressure build up behind the wall.

The rocla massbloc instant wall system is comprised of large permeable precast concrete blocks for various retaining applications for walls typically 2 8 metres in height.

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