Cantilever Concrete Retaining Wall Design

Retaining walls example 3 16 design of a cantilever retaining wall bs 8 110 the cantilever retaining wall shown below is backþlled with granular material having a unit weight of 19 knm 3 and an internal angle of friction of 30.

Cantilever concrete retaining wall design.

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. 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 stem may have constant thickness along the length or may be tapered based on economic and construction criteria.

These design methods are discussed in detail in allowable stress design of concrete masonry tek 14 7a and strength design of concrete masonry tek 14 4a refs. Many engineers use the cantilever wall term to actually describe gravity walls. There are eight geometric and four structural design variables for the reinforcement concrete cantilever retaining wall with the shear key as shown in fig. They are generally economical up to 10 feet in height for cast concrete structures.

Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation. Soil mechanics simplified 4. Retaining wall retains earth when level difference exists between two surfaces. Forces on retaining walls 6.

Design procedure overview 3. Overview of the design of cantilever retaining walls including the typical loads lateral soil pressures stability analysis and member design. Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. Cantilever walls cantilever wall design.

Earthquake seismic design 7. A gravity wall h 3m masonry or stone b cantilever wall h 3m and h 6m c counterfort wall h 8m d buttress wall transverse stem support provided on front side e e bridge abutment additional horizontal restraint from bridge deck a gravity wall h 3m masonry or stone. The base is divided into two parts the heel and toe. Counterfort retaining walls are more economical than cantilever walls for heights above 25 ft.

Building codes and retaining walls 5. Gravity poured concrete retaining walls. Assuming that the allowable bearing pressure of the soil is 120 knm 2 the. Pier and pile foundations 11.

Counterfort retaining walls 12. Recommended stem designs for reinforced cantilever retaining walls with no surcharge are contained in tables 1 and 2 for allowable stress design and strength design respectively. Geometric design variables were chosen with reference to geometry of the wall and structural design variables were modelled concerning to the critical sections of the wall.