For example, for a retaining wall that is 24 feet long and 2.5 feet high, we will need (24)(2.5)/54 = 1.111 cubic yards of gravel for backfill. Design Parameters: Soil Bearing Capacity, q all : 100 kPa; Coefficient of Soil Friction, : 30 The example calculations are made here using Mathcad. Rankine active earth pressure equations may then be used to calculate the lateral pressure on the face AB of the wall. Retaining Walls Assistant Prof. Berrak Teymur RETAINING WALLS are usually built to hold back soil mass 1. Plant gaps between boulders to improve wall durability; Boulder walls can be a beautiful and durable solution as a retaining wall or purely for decorative purposes. Walls might be constructed 1.6 m height soil layer is required to generate above passive pressure if we assume fully mobilization of passive pressure and neglect the friction under the foundation. Semi-Gravity Types 3. For a well-drained granular soil, a typical value for Ko= 0.50. In this calculation, we are concentrating on the two stability checks of sliding and overturning. Cantilever Reinforcement Reinforcement Counterfort 4. Let's say the prices in our area are: 5$ Worked Example: Figure A.1-Retaining Wall Cross Section. Overturning Moment = 45.584 x 3.9 / 3 = 59.259 kNm Design a reinforced concrete retaining wall for the following conditions. (b) Semi-gravity retaining walls are modification of gravity wall Here, the value is well above the required value. They depend mostly on their own weight and any soil resting on the wall for stability. Total base width should be checked even though it assumed to be 60-70% of the wall height in the beginning of the design. However, it could be vary depending on the design requirements. See Figure 3. Element designs with notes and discussions have added to get comprehensive knowledge. The wall is assumed to be located in the Christchurch Port Hills. Structural loads, structural analysis and structural design are simply explained with the worked example for easiness of understanding. Assuming that the allowable bearing pressure of the soil is 120 kNm 2, the Overturning and sliding checks are done to make sure the stability of retaining walls. Overturning Moment = 45.584 x 3.9 / 3, Restoring Moment = 159.12 x (2.6/2+0.4), Actual Factor of Safety = 270.504 / 59.259. Even without the weight of the structure, there is a higher restoring moment. Let's say we're building a retaining wall, that: has no cap row, is 30 feet long, is 10 feet high, is made out of 10in x 15in blocks, has a standard 12in thick backfill. precast in a factory or formed on site and considered economical up to about 25 ft in height. Use M20 concrete and Fe415 steel. It should be noted that the weight of the structure has not been considered in this calculation. The wall will be built adjacent to the roadway shoulder where traffic is 2 ft. from the barrier face. Case 01: No shear key, consider only friction between soil and concrete. f'c = 3000 psi fy = 60 ksi o Development of Structural Design Equations. Underpinning [art of foundation improvement]. Surcharge should be calculated using: = 1.2 G + 0.4 Q for the gravity case Height of the shear key can be determined as follows, Factor of safety = Allowable sliding force / Actual sliding force, Allowable sliding force = FOS (actual sliding force), 0.5 (Kph) h = 1.5 x 45.584, h2 =1.5 x 45.584 / (0.5Kp). Different types of retaining walls are used to retain soil in different places. The safety factor against sliding (minimum required F.S. f'c = 3000 psi fy = 60 ksi. thornton, co project no. {xO$S]%&7g>r=g8` Calculating retaining wall costs and materials - example. Retaining Wall Design Calculation Example Posted on April 29, 2012 by retainingwalldesign The cross section of a cantilever retaining wall is shown in figure 8.10.Calculate the factors of safety in regards to overturning,sliding and bearing capacity. RETAINING WALLS Slide No. Consider the cantilever retaining wall with the cross-section shown in the above Figure A.1, which retains a 2m depth of soil having the groundwater table at -1.0m level. CE 537, Spring 2011 Retaining Wall Design Example 1 / 8 Design a reinforced concrete retaining wall for the following conditions. Structural Guide 2021. Example Statement: The retaining wall supports 15'-0" of level roadway embankment measured from top of wall to top of footing. Counterfort Strectcher Headers Filled with soil Face of wall 5. n0%f|U9l 7?j`l7"tiNf]?uhgM Z4i[&LY_x The actual safety factor is well above the allowable value. =1.5) Do not consider the passive resistance of the fill in front of the wall. the backfill is horizontal.
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