Design of retaining wall sample pdf documents

Table 1 provides the order of precedence for reference documents and engineering design standards, applicable to the detail design of the retaining walls on. Ce 537, spring 2011 retaining wall design example 2 8 substituting eqn. Abarac current retaining wall design procedures are summarized with emphasis on the prediction of lateral earth pressures using the coulomb and rankine earth pressure theories, and the equivalent fluid pressure method. Resources technical notes keystone retaining wall systems. Water must not be allowed to build up behind the wall. Segmental retaining walls best practices guide 3 segmental retaining walls best practices guide for the speci. Retaining walls, fence and guardrail walls, and columns, in a convenient and easy to use format. It is the intent of the city to hire a qualified consultant who can facilitate environmental compliance, permitting clearance if necessary, design, and construction support services at citys option. One cause of wall failure is poor drainage resulting in saturated soil and frost heaving. Title sheet qis the correct project name, location and project number shown. Gabion walls may be stepped on either the front or the back soil side face as illustrated.

P a active earth pressure or earth pressure pa and passive earth pressure pp. Design begins with the selection of trial dimensions for a typical vertical cross section through the wall. Spreadsheet design of mechanically stabilized earth walls. There various parts of a retaining wall and design principles of these retaining wall components based on different factors and material and methods of construction are discussed. Design method for the mse wall and rail supp or tsl ab is nc dew hlrfd g m. Wisdot regional staff determines the need for permanent retaining walls on highway projects. Principles of retaining wall design the constructor. A retaining wall that meets all of the following conditions. Design of the retaining wall structures on the m4 smart motorway. The retaining wall is located partially or entirely within the bridge zone figure 15. There are another type of retaining wall called counterfort rw and is a. Infill material the soil material placed behind the retaining wall facing. They are not full detailed calculations such as might be prepared for a real wall design but are limited to the calculation of earth pressure and bearing capacity, showing how the. And require design consistent with either cantilever or counterfort design.

Retained height ft wall height above soil ft slope behind wall. We believe that a twelve degree setback maximizes the leverage achieved by a battered wall, while providing a finished retaining wall that fulfills the. In minutes you can design or analyze nearly any configuration or loading condition for cantilevered, restrained, gravity, gabion, soldier pile, or segmental retaining walls. However, the term is usually used with reference to a cantilever retaining wall, which. Assuming that the allowable bearing pressure of the soil is 120 knm 2, the. Additional field investigation and engineering evaluation are recommended for estimating rock excavation and balancing earthwork cuts and fills, for retaining wall foundation design, and for design of high cut and fill slopes. Deflection generally governs design for cantilever walls more than 18 feet high. The following worked examples have been prepared to illustrate the application of bs8002 to retaining wall design. This gl pressure tends to deflect the wall outward. The design of both types is based on the same principles.

Worked example 2 design of concrete cantilever retaining. Ce 437537, spring 2011 retaining wall design example 1 8 design a reinforced concrete retaining wall for the following conditions. The retaining wall does not meet the definition of bridge abutment. The purpose of the preliminary design submission pds is to provide the department with reasonable assurance that the design of the project is proceeding in a reasonable manner and that the designer has considered all areas that can have a major impact on the design of the project. Collection of undisturbed laboratory soil shear test samples. See more ideas about garden design, outdoor gardens and backyard. The safety factor against sliding minimum required f. Any wall that sustains significant lateral soil pressure is a retaining wall. Reviewing mse retaining wall shop drawings for design. Retaining wall development is described in section 11555 of the. Worked example to accompany mbie guidance on the seismic design of retaining structures for residential sites in greater christchurch version 2 november 2014. Geotechnical technical guidance manual may 2007 introduction 11 section 1 introduction this geotechnical technical guidance manual tgm provides technical guidance for geotechnical work performed by the federal lands highway flh. 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. Results from pre vious large scale retaining wall tests and field studies are presented.

Variations on the basic design, including curves, tiers, railings, stairs, walkways and the like are making them more and more attractive to designers and architects. Retaining wall rww3 is estimated to be in excess of 29 feet. Examples of this include cip cantilever, mse and modular block walls. Technical notes provided is a collection of one page pdf summary documents on specific engineering topics for the design of keystone retaining wall systems. Basics of retaining wall design 10 editionth a design guide for earth retaining structures contents at a glance. I35w retaining wall design exhibit a draft scope of work. Masterseries retaining wall design sample output the following output is from the retaining wall design program. It provides guidance for understanding and applying policies, standards and criteria in recognition of the need to. This guide, segmental retaining walls best practices guide for the specification, design, construction, and inspection of srw systems, is published and maintained by the national concrete masonry association ncma since segmental retaining wall systems were first introduced in the 1980s, there has been a continuous evolution and. Types of retaining walls tieback wall tieback is a horizontal wire or rod, or a helical anchor use to reinforce retaining wall for stability one end of the tieback is secured to the wall, while the other end is anchored to a stable structure i.

The contract documents and contract requirements are discussed in. Loads and forces acting on retaining wall and their. Combined footing design excel spreadsheet excel spreadsheet calculator of cantilevered sheet. The ab stones provide a nominal setback of twelve degrees from vertical.

Whereas, if bracing is in front of the wall and is in compression instead of tension, the wall is called buttress retaining wall. Worked examples of retaining wall design to bs8002. Earth pressure p 8 earth pressure is the pressure exerted by the retaining material on the retaining wall. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are american concrete institute building code requirements for structural concrete aci 318 which is referenced in nrcs. Course objectives they seem to crop up everywhere, like cell phone towers. To further understand the designed approach, here is a worked example of the design of the retaining wall. Design and detailing of counterfort retaining wall when the height of the retaining wall exceeds about 6 m, the thickness of the stem and heel slab works out to be sufficiently large and the design becomes uneconomical. The contractor will use guidance provided in exhibit a. Deresch landscaping iswas not involved in any of these projects. If you design retaining walls, you know its tedious and timeconsuming.

The eic will submit the engineering analysis and final detailing of the soil nail wall system performed by the. Conventional retaining walls this module presents the caltrans standard practice for the geotechnical investigation, design, and reporting for conventional retaining walls. Rail support slab collision tl4 design live loading. Design and analysis of retaining walls 2 economical when the wall height exceeds 8m. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Retaining walls are designed to resist earth pressures exerted by only the weight of soil retained.

Calculations per aci 31811, aci 53011, ibc 2012, cbc 20, asce 710. All drawings qare drawings in the correct format size, etc. A wall number is assigned as per criteria discussed in. The approval process for the design and installation personnel for the soil nail wall system is directed through the deputy chief engineer technical services dcets.

Retaining walls in theory and practice, a textbook for. Mechanically stabilized earth mse retaining walls are growing in popularity. Usually the cantilever wall stem is of concrete block. Design of retaining walls the design of retaining wall must account for all applied loads. Retaining walls types details with analysis and design. In such a case counterforts having trapezoidal section fixed at the base slab are provided at intervals of 1. This example is intended to be readily calculated by hand although a lot of structural spreadsheets and software such as prokon are available. Table 2, table 3 soil properties table 2 compact sand. Aashto lrfd bridge design specifications, section 11. Reinforced concrete wall design basics mike oshea, p. When retaining wall is designed for impact loads, the stem should be checked at equally spaced points along stem length from top to the bottom as impact load spread at the greater length of the stem.

A n beal earth retaining structures worked examples 2 1. Determine the factors of safety against sliding and overturning. A n beal earth retaining structures worked examples. The geotechnical report checklists pages 11 through 27 cover the important information that should be presented in project geotechnical reports. Contents 2 reinforced concrete retaining wall with sloped embankment to bs 4 gravity masonry stepped retaining wall with reinforced concrete base to ec 6 basement cavity filled masonry propped retaining wall ec. Drainage is an important aspect of any retainingwall project. Comprehensive design procedures, standards, and sample. Lateral forces on retaining wallsence 454 assakkaf design of retaining walls the design of retaining wall must account for all applied loads. Active earth pressure or earth pressure pa and passive earth pressure p p. The load that presents the greatest problem and its primary concern is the lateral earth pressure induced by the retained soil. Drainage material the crushed rock, gravel or similar material placed behind a retaining wall to convey ground water away from the wall and foundations. Conventional retaining walls are rigid gravity and semigravity retaining walls as defined in aashto lrfd bds section 11.

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. These are much less than the hydrostatic pressure exerted by water trapped behind the wall. In this example, the structural design of the three retaining wall components is performed by hand. Nicholson designed and installed a semicontinuous reinforced drilled shaft soldier pile retaining wall with tieback anchors, which relieved pressure on the existing wall and stabilized the slope.