Mass Concrete Retaining Wall Design

The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. 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. Gravity retaining walls depend on their own weight and any soil resting on the concrete in resisting lateral earth forces.

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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.

Mass concrete retaining wall design.

Try 1400mm thick wall. Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider. 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.

Construction is mortar less and an experienced crew can place up to 80m2 of wall per day. The blocks are interlocked by a key joint precast into the blocks. 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. Design procedure overview 3.

Because of their large mass. Both proprietary block and crib retaining walls must be built on an in situ concrete foundation or on a compacted base course. Forces on retaining walls 6. Ce 437 537 spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions.

Retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. 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. Counterfort retaining walls are more economical than cantilever walls for heights above 25 ft. Gravity poured concrete retaining walls.

Building codes and retaining walls 5. They are generally economical up to 10 feet in height for cast concrete structures. Soil mechanics simplified 4. In this example the structural design of the three retaining wall components is performed by hand.

The graviti block retaining wall system comprises large precast permeable mass concrete blocks manufactured under stringent quality control. F c 3000 psi fy 60 ksi natural soil development of structural design equations. 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. Earthquake seismic design 7.

The base is divided into two parts the heel and toe. 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. Allowable stress design lateral loads plain concrete masonry retaining wall unreinforced concrete masonry designed to resist sliding by using reinforcement. 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.

Two equations are developed.

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