Analysis and design of cantilever retaining wall using. Figure 1 illustrates typical cantilever retaining wall detailing requirements. Please note this value is applied only for passive pressure. Structural design of cantilever retaining wall is depend on separating each part of wall and design it as a cantilever, so its called cantilever r. Worked example 2 design of concrete cantilever retaining. Stepbystep design of a cantilevered retaining wall. Calculate lateral earth pressure forces acting on the wall.
Cantilever walls are economical for heights up to 10 m 32 feet. It has much thinner stem and utilize the weight of the backfill soil to provide most of the resistance to sliding and overturning. Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. Stability of retaining wall is obtained by sum of the moments of. Retaining wall design is crucial for giving support to slopes of soil, that would otherwise be unstable and runoff. The wall can be either cast insitu figure 6, or precast figure 7. Cantilever retaining wall analysis, design, drawing and quantity software. The following figure shows theses different types of. Semigravity retaining wall the size of section of a gravity retaining wall may be reduced if a small amount of reinforcement is provided near the back face. Section showing counterfort retaining wall for bus parking area at m level. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a. The basic design precepts employed in cantilever walls include considerations of dead man tiebacks, taking active pressures to the bottom of the wall and considering any reductions in passive resistance for inclined slopes. The exposed vertical face can be treated in many ways, including the use of textured form liners to give. This objective has been accomplished and the proposed modifications in design procedure are based on measured earth pres sures, measured wall movements, and measured geotechnical properties of the soils adjacent to the wall.
It should be noted that in the present research, the mechanical behavior of the cantilever. We require this information in order to email you a working demo. Design and detailing of retaining walls learning outcomes. The different types of wall designs include gravity, semigravity, cantilever and counterfort. Also the retaining wall has been modeled in two states with and. Cantilever retaining wall sheet excel civil engineering. The cantilever retaining wall shown below is backfilled with granular material having a unit weight. Semigravity retaining wall reduce the dimensions of the gravity retaining wall by using some reinforcement. The weight of the soil mass above the heel helps keep wall stable.
Optimal design of cantilever reinforced concrete retaining wall can lead. The safety factor against sliding minimum required f. The cantilever retaining wall design involves two major steps. This gl pressure tends to deflect the wall outward. The model cantilever walls tested in this study have the. Classification of retaining walls cantilever retaining wallrcc inverted t and l counterfort retaining wallrcc. Stability of retaining wall should be checked against three main factors. Figure 1reinforced cantilever retaining wall detailing mortar cap or other, as desired bond beam, as required vertical reinforcing bars, as required wall thickness joint or horizontal reinforcement, as required drains as required grout dowels reinforcing bars as. Oct 12, 2017 analysis and design of cantilever retaining wall using prokon. Retaining walls are structures used to retain earth or water or other materials such. Cantilever retaining wall sheet excel web share 20161018t23. It is extensively used in variety of situations such as highway engineering, railway engineering, bridge engineering and irrigation engineering. Counterfort retaining wall analysis, design, drawing and quantity software.
In this type of retaining wall, counterforts cantilevers are provided on the earth side between wall and footing to support the wall, which essentially spans as a. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. Browse anchor walls technical materials, including retaining wall design examples and specifications, cad drawings, wall section detail dwg files, installation instructions and more. Generally, the main goals of the present study include an evaluation of the effect of geofoams thickness and density, effect of using two vertical geofoam panels, effect of the sectional shape of geofoam rectangular and trapezoidal on displacements, and static forces on the cantilever retaining wall. Using finite element, plaxis can model heterogeneous soil types, complex stratigraphic and slip surface geometry, and variable porewater pressure conditions using a large selection of soil models. Cantilever walls cantilever wall design deep excavation. Cantilever retaining wall sheet excel civil engineering program. When the height of the cantilever retaining wall is more than about 7m, it is. Soilstructure software increases the engineers bottom line by eliminating hours of tedious calculations. Cantilever retaining wall cantilever retaining walls are made of reinforced cement concrete. A sheet pile wall is required to support a 12 excavation. Calculate the factors of safety with respect to overturning, sliding, and bearing. Geotechnical design of cantilever retaining walls to eurocode. Cantilever retaining wall design using asdip retain youtube.
Geotechnical design of cantilever retaining walls to. Retaining counterfort wall design free download as pdf file. Figure 1 example of retaining walls retaining wall structures can be gravity type structures, semigravity type structures, cantilever type structures, and counterfort type structures. Many engineers use the cantilever wall term to actually describe gravity walls. Design and construction of cantilevered retaining walls. Sustainable sites can use precast retaining walls to decrease the amount of site grading required. Dimensions of the cantilever retaining wall shear key in retaining wall since the cantilevered retaining wall is by far the most common type of retaining wall used, it is important to. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation. Vertical stem in cantilever retaining wall resists earth pressure from backfill side and bends like a cantilever. Pdf retaining walls are engineering structures constructed to resist lateral forces imposed by soil movement and water pressure. Reinforced concrete cantilever retaining wall analysis and design aci 31814 reinforced concrete cantilever retaining walls consist of a relatively thin stem and a base slab. Types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. A retaining wall is one of the most important types of retaining structures. These professional practice guidelines retaining wall design were developed with the support of the city of nanaimo.
Select the resources you need and click view collected to download all selected resources as a zip file or share your selection of resources as a custom link. Reinforced concrete cantilever retaining walls consist of a relatively thin. The stem may have constant thickness along the length or may be tapered based on economic and construction criteria. Mar 03, 2019 types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. Cantilever retaining wall article about cantilever. Concrete retaining wall product technical materials. This publication presents an example on the design of retaining structures. Cantilever retaining wall reinforced concrete wall with small dimensions. Reinforced concrete cantilever retaining wall analysis and. Cantilever sheet pile the two basic methods of designing anchored sheet pile walls pressure envelop for braced cut design the struts limit lateral wall, sheet pile wall design example download as pdf file. Deeper cantilever walls have been constructed but these required more expensive wall systems such as ttype diaphragm walls. Cantilever walls offer an unbstructed open excavation.
Worked example 2 design of concrete cantilever retaining walls to. In general, the maximum excavation for a cantilever wall can reach up to 6m or 18ft. Common failure modes of cantilever retaining walls, from huntingtons earth pressures and retaining walls 1957 the basic design precepts employed in cantilever walls include considerations of dead man tiebacks, taking active pressures to the bottom of the wall and considering any reductions in passive resistance for. Calculate the factors of sa fety with respect to overturning, sliding, and bearing capacity. The slide occurred just east of the third street exit ramp. Precast retaining walls can create inviting seating spaces, create landscaped gardens, or even increase useable site area. Staad pro retaining wall analysis and designcantilever type 2018 easy method duration. These guidelines will assist engineering professionals in undertaking the design of retaining walls in a consistent manner, incorporating best practices such. This series of editions began in 1996 as a modest companion manual to accompany my work.
Main features calculate earth pressure coefficients based on rankines theory and coulombs theory. Cantilever retaining wall a structure, which is usually either castinplace or made of precast concrete but could. Structural design of cantilever retaining wall is depend on separating each. Retaining walls leed reference guide for precast concrete products. The base is divided into two parts, the heel and toe. It is constructed of reinforced portlandcement concrete pcc was the predominant type of rigid retaining wall used from about the 1920s to 1970s. The following worked example is for a freestanding cantilever wall that is considered sufficiently flexible for active. In the design of civil engineering structures, retaining walls are normally used to retain soil earth materials, and they are usually found on embankments, highways, basement of buildings, etc. Cantilever retaining wall is the most common type of earth retaining structure. Analysis and design of cantilever retaining wall using prokon. Design of cantilevered wall, granular soil introduction. Earth pressure and retaining wall basics for nongeotechnical. P a active earth pressure or earth pressure pa and passive earth pressure pp.
Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation. Cantilever retaining wall with shear keywith shear key batter drainage hole toe 2. Active earth pressure tends to variation of earth pressure deflect the wall away from the 5. Pdf sheet pile walls are used to support moderate height of excavation. Pdf ground settlement and deflection response of cantilever. Precast retaining walls can help reduce steep slope water runoff which helps control soil erosion. This excel file is set up the allow you to design cantilever retaining walls. For modeling the retaining wall, the plate element is used. The thickness of cantilever slab is larger at the base of stem and it decreases gradually upwards due to reduction of soil pressure with decrease in depth. Mar 10, 2019 types of reinforced concrete retaining walls are cantilever retaining walls and counterfort retaining walls. Section 9 of en 19971 applies to retaining structures supporting ground i. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate.
Hence this attempt to condense, simplify and compile information from many sources, including my own. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Cantilever retaining wall are usually of reinforced concrete and work on the principles of leverage. Cantilever retaining wall functions and design considerations. Figure2 representation of reinforcement in this type of retaining wall geotechnical design of retaining wall stability of retaining wall should be checked against three main factors. To take into account the friction between the wall and the soil, we use friction angle. Because our engineers are also consultants, soilstructure software is in sync with current state of practice. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. It is time consuming to do all the stability and reinforcement design using in house tools. Example 11 castinplace concrete cantilever retaining wall 4 2020 summary of unfactored loads and moments resolve moments about point a see figure 1 typical section load combinations ev 1 ev 2 dc 2 dc 3 vehicular collision load 18. Gravity retaining wall depends on its weight for resisting lateral earth force because it have a large weigh 2.
Deflection generally governs design for cantilever walls more than 18 feet high. Cantilever retaining wall design this excel file is set up the allow you to design cantilever retaining walls. Such walls are known as semi gravity retaining wall. Cantilever walls are built of reinforced concrete and are typically composed of a horizontal footing and a vertical stem wall. Retaining wall a vertical or nearvertical structure constructed to hold back geotechnical materials and.
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