They consist of a relatively thin stem and a base slab. The base is also divided into two parts, the heel and toe. The heel is the part of the base under the backfill. The toe is the other part of the base. Use much less concrete than monolithic gravity walls, but require more design and careful construction.
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Counterfort retaining wall example As an example, consider the retaining wall shown below, which supports a flat backfill load. Due to the wall height of 25 feet, the use of counterforts has proven itself to be a more economical solution. The soil bearing capacity is 4 ksf. The backfill density is pcf and the friction angle is 30 degrees.
Design the counterfort retaining wall. Design Steps 1. As a rule of thumb, the footing length should be about 0. The At-a-Glance tab shows a summary of the design for a quick overview of your work as you go. The Condensed tab shows a more complete set of results grouped by topic, great for a more detailed overview of your design. The Detailed tab shows a complete set of calculations with exposed formulas and with references to the ACI code.
Click to enlarge Click to enlarge Click to enlarge 2. We will use the Rankine theory to calculate the lateral soil pressures. The water table is set to zero. No surcharge or concentrated loads were given as part of the problem. The Stability tab shows graphically the pressures and forces on the wall, as well as the stability safety factors per load combination.
Click to enlarge 3. The Stem tab shows the pressures acting on the stem, and the shear and moment diagrams when the stem is subjected to the lateral pressures, considering the counterforts as the supports. Click to enlarge 4. The Footing tab shows graphically the toe and heel design, including the bearing pressure and design ratios per load combination.
This example shows that the design can be completed and optimized within minutes. Best regards,.
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