Mass Concrete Retaining Wall Design

The graviti block retaining wall system comprises large precast permeable mass concrete blocks manufactured under stringent quality control.

Mass concrete retaining wall design.

Ce 437 537 spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. The blocks are interlocked by a key joint precast into the blocks. F c 3000 psi fy 60 ksi natural soil development of structural design equations. 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.

Both proprietary block and crib retaining walls must be built on an in situ concrete foundation or on a compacted base course. Construction is mortar less and an experienced crew can place up to 80m2 of wall per day. Design procedure overview 3. Retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance.

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. 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. Because of their large mass. 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.

Two equations are developed. In this example the structural design of the three retaining wall components is performed by hand. Try 1400mm thick wall. Allowable stress design lateral loads plain concrete masonry retaining wall unreinforced concrete masonry designed to resist sliding by using reinforcement.

Soil mechanics simplified 4. Forces on retaining walls 6. 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 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 stem may have constant thickness along the length or may be tapered based on economic and construction criteria. Gravity retaining walls depend on their own weight and any soil resting on the concrete in resisting lateral earth forces. Counterfort retaining walls are more economical than cantilever walls for heights above 25 ft. The base is divided into two parts the heel and toe.

Based on our example in figure a 1 we have the forces due to soil pressure due to water and surcharge load to consider. Gravity poured concrete retaining walls. Earthquake seismic design 7. Soil bearing and stability 8.

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.