Example 11 castinplace concrete cantilever retaining wall 7 2020 sliding check aashto 10. This publication presents an example on the design of retaining structures. The weight of the soil mass above the heel helps keep wall stable. Design and detailing of retaining walls learning outcomes. Cantilever walls are walls that do not have any supports and thus have a free unsupported excavation. Of these walls, only the cantilever retaining walls and the bridge abutments are mostly used at present due to their great economics. Cantilever retaining wall functions and design considerations. Deflection generally governs design for cantilever walls more than 18 feet high. Dr andrew bond director, geocentrix ltd chairman tc250sc7. This video explains about how the forces acting on cantilever retaining wall and check for the factor of safety against sliding and factor of safety against overturning. It is for both the practicing engineer who has become a bit rusty on this. Full details of masonry wall construction are provided in reinforced concrete masonry cantilever retaining walls design.
Foundation design cantilever sheet pile walls cantilever walls are usually used as floodwall or as earth retaining walls with low wall heights 3 to 5 m or less. Because cantilever walls derive their support solely from the foundation soils, they may be installed in. It has much thinner stem and utilize the weight of the backfill soil to provide most of the resistance to sliding and overturning. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Determine the factors of safety against sliding and overturning. Nominal design values are typically provided in the projectspecific geotechnical report. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. This is an extremely popular system offering benefits that include zero lot lines, a vertical wall face and a range of possible finishes. The stem is a vertical cantilever beam, acted on by the horizontal earth pressure. Retaining wall development is described in section 11555 of the. Design the wall 1015 water management 1617 job site considerations 18 working with soils 19. Static pressure on retaining wall the seismic behavior of retaining wall depends on the total lateral earth pressure that develops during the earth shaking. Support and documentation for the geo5 software using standards and analysis settings inputting the geological. This loading situation can be found when retaining wall.
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. On the basis of the rankine theory of earth pressure, final design may proceed with the following steps. Appendix a examples colorado department of transportation. Calculate lateral earth pressure forces acting on the wall. Cantilever retaining walls can be precast in a factory or formed on site and considered economical up to about 25 ft in height. Types of retaining walls cantilever wall economical for height of up to 8 m structure consist of a vertical. Design of concrete cantilever retaining walls to resist. The design of reinforced concrete cantilever retaining walls shall be as stated herein. Design of concrete cantilever retaining walls building. The contractor will use guidance provided in exhibit a. The focus of the guideline is the geotechnical aspects of retaining wall design.
Sep 20, 2016 analysis and design of a retaining wall chapter one introduction retaining walls cantilever rw rankin theory forces on cantilever rw counterfort rw forces on counterfort rw the gravity rw forces on gravity rw chapter two stability of retaining wall soil properties of rws drainage in rw allowable bearing capacity chapter three procedure for the continue reading analysis and design of a. Geotechnical design of cantilever retaining walls to. Figure 1reinforced cantilever retaining wall detailing mortar cap or other, as desired bond beam. Basis of design for embedded walls verification of strength.
Design of retaining wall with counterfort engineering. After this present you will be able to do the completecomplete design design andand detailingdetailing ofof differentdifferent typestypes ofof. Deflection generally governs design for cantilever walls. Calculate the factors of sa fety with respect to overturning, sliding, and bearing capacity. Wisdot regional staff determines the need for permanent retaining walls on highway projects. Cantilever retaining wall sheet excel civil engineering. Analysis of embedded retaining wall using the subgrade reaction method 61 2 2 m x dx d w x ej 4 3 3 t x dx d w x ej 5 where mx is the bending moment and tx is the shearing force. Cantilever retaining wall sheet excel web share 20161018t23. Introduction sliding settlement overturning failure in retaining wall. Retaining wall rww3 is estimated to be in excess of 29 feet. Cantilever walls are built of reinforced concrete and are typically composed of a horizontal footing and a vertical stem wall. Ce 437537, spring 2011 retaining wall design example 3 8 3. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014.
Analysis and design of a retaining wall download project. Cantilever retaining wall ouestion for the retaining wall and the profile shown below, calculate. This design guide presents a thorough coverage of designing cantilevered retaining walls for the design engineer, including tabulated designs for various soil characteristics with level and sloping backfill, for walls 3 to 22 feet high. It offers a number of retaining wall shapes and analyzes rc crosssections. 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. Cantilever retaining wall is the most common type of earth retaining structure. Cantilever and restrained retaining wall design software. In the past, structville has published a 17 page document on geotechnical design of cantilever retaining walls subjected to earth load, pavement surcharge load, traffic load, etc. Examples of this include cip cantilever, mse and modular block walls. Wsdot standard plan reinforced concrete retaining wall. Design procedures for a cantilever retaining wall library. Cantilever retaining wall design using asdip retain youtube.
In addition, the flexural failure mechanism also occurs in cantilever wall. Design guide for cantilevered retaining walls default. If you want to design a retaining wall on drilled piers and grade beam, go to this page. Cantilever walls are economical for heights up to 10 m 32 feet. However, retaining wallscanalsobeconstructed for aesthetic landscaping purposes. In addition, the bearing pressure under the footing or bottom of the retaining wall should not exceed the allowable soil bearing pressure.
The objective of this research was to conduct a field performance study on a full scale cantilever retaining wall in order to verify or modifyu current design procedures. You get a 7 to 9 pages report output to document your retaining wall calculations. Cantilever retaining wall is the most common type of earth retaining. Retaining wall design design example1 design a cantilever retaining wall t type to retain earth for a height of 4m. This objective has been accomplished and the proposed. Cantilever walls the cantilever wall figure 1b and figure 2 is the most common type of retaining structure and generally is used for walls in the range from 10 to 25 ft in height. Cantilever walls cantilever wall design deep excavation.
Provide the distribution steel 26 design example cantilever retaining wall 27 design a cantilever retaining wall t type to retain earth for a height of 4m. Assuming that the allowable bearing pressure of the soil is 120 knm. This loading situation can be found when retaining wall is used to support embankment carrying traffic road way. Cantilever walls restrain retained earth by the passive resistance provided by the soil below the excavation. Retaining walls in theory and practice, a textbook for. Analysis and design of cantilever retaining wall using prokon duration. Design of concrete cantilever retaining wall od4p6pmr5dlp. Basics of retaining wall design page viii why this book. Weber course content content section 1 retaining walls are structures that support backfill and allow for a change of grade. And require design consistent with either cantilever or counterfort design.
Analysis and design of cantilever retaining walls on staad. Cantilever retaining wall reinforced concrete wall with small dimensions and it is the most economical type and the most common note. I35w retaining wall design exhibit a draft scope of work. Concrete masonry reinforced cantilever retaining walls edition e3, may 20 isbn. Many engineers use the cantilever wall term to actually describe gravity walls. Structural design of cantilever retaining wall is depend on separating each part of wall and design it as a cantilever, so its called cantilever. File example 11 castinplace concrete cantilever retaining wall. This is a simple web app that is able provide a basic design of a cantilever retaining wall based on user inputs.
Home construction xls xls file design of retaining wall. These design methods are discussed in detail in allowable stress design of concrete masonry, tek 147a, and strength design of concrete masonry, tek 144a refs. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. For the user this book is intended to cover and explain design practices and building code requirements for the design of earth retaining structures. 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. Retaining walls in theory and practice, a textbook for students. The objective of this guideline is to provide information on retaining wall design in accordance with the city of nanaimo the city and the british columbia building code bcbc requirements. Full details of masonry wall construction are provided in reinforced concrete masonry cantilever retaining walls design and.
This document is published by the chief executive of mbie. Allan block is a leading provider of patented retaining wall systems. Usually the cantilever wall stem is of concrete block. However, retaining walls can also be constructed for aesthetic landscaping purposes. Cantilever retaining wall example free download as pdf file. Feb 06, 2018 example of a cantilever retaining wall design using asdip retain. The cantilever retaining wall shown below is backfilled with granular material having a unit weight. Cantilever wall is an intuitive program for cantilever retaining walls design.
The safety factor against sliding minimum required f. Dimension in m, active earth pressure, passive earth pressure. Example 11 castinplace concrete cantilever retaining wall 3 2018 ev 3 ev 1 ev 2 ls v ls h eh dc dc 2 dc 4 dc 3 front face. This document is part of a series of guidance modules developed jointly by the ministry of business. Cantilever retaining wall are usually of reinforced concrete and work on the principles of leverage. Figure 1 illustrates typical cantilever retaining wall detailing requirements. The wall must be design to be stable under the effects of lateral pressure. Pdf advanced measurements on cantilever retaining wall models. These plans will be developed using microstation v8i and geopak v8i. Ce 537, spring 2011 retaining wall design example 3 8 3. Main features calculate earth pressure coefficients based on rankines theory and coulombs theory. The contract documents and contract requirements are discussed in. This document contains only selected pages from the full document. Design a cantilever retaining wall to retain earth embankment 4m high.
You should also be aware of the difference in assumed skin friction, depending on whether the wall stem was poured inplace against the roughened earth, or poured against smooth concrete forms. This information is published by the ministry of business, innovation and employments chief executive. Residential retaining wall installation guide for allan. 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.
273 1160 713 1460 831 1122 1006 428 385 1505 1133 324 1266 1427 930 1487 1199 911 234 1522 912 367 145 804 215 426 560 1327 1275 1224 1080 57 987 39 759 1511 922 595 1349 944 1384 687 281 430 521